Pub Date : 2020-11-22DOI: 10.1080/01614940.2020.1812212
D. Prasad, Komal N. Patil, N. Chaudhari, Hern Kim, B. Nagaraja, A. H. Jadhav
ABSTRACT The involvement of CO2 as a renewable and abundant feedstock toward a carbon balanced future has led to production of several value-added products. The primary focus in the current effort is to assess fixation of CO2 and epoxides into cyclic carbonates by employing state-of-the-art metal complexes as promising catalytic systems. Our attention is restricted to Earth-abundant metals such as aluminum, cobalt, iron, zinc and few transition metals in association with different ligand skeletons used for the structural construction of the respective complexes. This review sequentially categorizes these complexes and provides a panoramic overview of their selective catalytic activities and mechanistic understandings based on experimental and theoretical evidences.
{"title":"Paving way for sustainable earth-abundant metal based catalysts for chemical fixation of CO2 into epoxides for cyclic carbonate formation","authors":"D. Prasad, Komal N. Patil, N. Chaudhari, Hern Kim, B. Nagaraja, A. H. Jadhav","doi":"10.1080/01614940.2020.1812212","DOIUrl":"https://doi.org/10.1080/01614940.2020.1812212","url":null,"abstract":"ABSTRACT The involvement of CO2 as a renewable and abundant feedstock toward a carbon balanced future has led to production of several value-added products. The primary focus in the current effort is to assess fixation of CO2 and epoxides into cyclic carbonates by employing state-of-the-art metal complexes as promising catalytic systems. Our attention is restricted to Earth-abundant metals such as aluminum, cobalt, iron, zinc and few transition metals in association with different ligand skeletons used for the structural construction of the respective complexes. This review sequentially categorizes these complexes and provides a panoramic overview of their selective catalytic activities and mechanistic understandings based on experimental and theoretical evidences.","PeriodicalId":9647,"journal":{"name":"Catalysis Reviews","volume":"42 1","pages":"356 - 443"},"PeriodicalIF":0.0,"publicationDate":"2020-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86459340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-16DOI: 10.1080/01614940.2020.1831756
J. J. Torrez-Herrera, S. Korili, Amparo Gil
ABSTRACT The development of materials that can exhibit thermal resistance at very high temperatures, thus allowing them to be applied as catalysts and thermal insulators, amongst other possible uses, is a research subject of great interest. This is the case for hexaaluminates, a class of hexagonal aluminate compounds with a unique structure that are stable at very high temperatures up to 1600°C and exhibit exceptional resistance to sintering and thermal shock, thus making them attractive catalysts for high-temperature applications. In this review, the structure of hexaaluminates is presented first. The most recent advances in synthetic methods (sol-gel, reverse microemulsion, hydrothermal synthesis, carbon-templating, solution combustion synthesis, and freeze-drying methods) are discussed subsequently, with the aim of maximizing textural properties and including in their structure metals known to be active in catalytic applications, such as combustion of CH4, partial oxidation, and dry reforming of CH4 to produce synthetic gas, and the decomposition of N2O. Finally, other applications, such as their function as a thermal barrier, are also addressed.
{"title":"Progress in the synthesis and applications of hexaaluminate-based catalysts","authors":"J. J. Torrez-Herrera, S. Korili, Amparo Gil","doi":"10.1080/01614940.2020.1831756","DOIUrl":"https://doi.org/10.1080/01614940.2020.1831756","url":null,"abstract":"ABSTRACT The development of materials that can exhibit thermal resistance at very high temperatures, thus allowing them to be applied as catalysts and thermal insulators, amongst other possible uses, is a research subject of great interest. This is the case for hexaaluminates, a class of hexagonal aluminate compounds with a unique structure that are stable at very high temperatures up to 1600°C and exhibit exceptional resistance to sintering and thermal shock, thus making them attractive catalysts for high-temperature applications. In this review, the structure of hexaaluminates is presented first. The most recent advances in synthetic methods (sol-gel, reverse microemulsion, hydrothermal synthesis, carbon-templating, solution combustion synthesis, and freeze-drying methods) are discussed subsequently, with the aim of maximizing textural properties and including in their structure metals known to be active in catalytic applications, such as combustion of CH4, partial oxidation, and dry reforming of CH4 to produce synthetic gas, and the decomposition of N2O. Finally, other applications, such as their function as a thermal barrier, are also addressed.","PeriodicalId":9647,"journal":{"name":"Catalysis Reviews","volume":"39 1","pages":"592 - 630"},"PeriodicalIF":0.0,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86207844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-01DOI: 10.1080/01614940.2020.1831757
Sandhya Saini, P. K. Prajapati, S. Jain
ABSTRACT Carbon dioxide (CO2) utilization for the production of fuels and energy-rich chemicals is one of the attractive topics of research in modern-day chemistry. The main barriers in the CO2 utilization include: 1) the cost associated in CO2 capture, separation, purification, and transportation; 2) higher energy demand for conversion due to its higher kinetic and thermodynamic stability; 3) the lack of socio-economical driving forces. Valorization of CO2 has been realized as a viable option for the mitigation of CO2 as well as to create new business opportunities. Carbon dioxide is a nontoxic, renewable, and abundant C1 source; whereas carboxylation of olefins to carboxylic acids represents one of the most important transformations owing to the broad applicability of these chemicals in various domains, such as water-absorbing polymers, preservatives of food, fertilizers, building blocks for the manufacturing of cosmetics, soaps, detergents, rubbers, dyes, animal feed, plastics, agrochemicals and pharmaceuticals. The present review mainly focuses on the recent advances in the transition metal-catalyzed carboxylation of the olefins by using carbon dioxide as a feedstock. Firstly, the hydrocarboxylation or direct carboxylation using coordination complexes of transition metals such as rhodium, copper, cobalt, nickel, ruthenium, iron, palladium, and zirconium have been discussed in detail. In the next section, the hetero carboxylation reactions, for example, boracarboxylation, silacarboxylation, carbocarboxylation, thiocarboxylation and dicarboxylation have been presented to explore the wider scope of CO2 utilization for carboxylation reactions. Lastly, the carboxylation of dienes and difunctionalization reactions have been discussed. Further, the recent trends and key challenges in the use of CO2 as a carbxylating agent for carboxylation reactions have been described.
{"title":"Transition metal-catalyzed carboxylation of olefins with Carbon dioxide: a comprehensive review","authors":"Sandhya Saini, P. K. Prajapati, S. Jain","doi":"10.1080/01614940.2020.1831757","DOIUrl":"https://doi.org/10.1080/01614940.2020.1831757","url":null,"abstract":"ABSTRACT Carbon dioxide (CO2) utilization for the production of fuels and energy-rich chemicals is one of the attractive topics of research in modern-day chemistry. The main barriers in the CO2 utilization include: 1) the cost associated in CO2 capture, separation, purification, and transportation; 2) higher energy demand for conversion due to its higher kinetic and thermodynamic stability; 3) the lack of socio-economical driving forces. Valorization of CO2 has been realized as a viable option for the mitigation of CO2 as well as to create new business opportunities. Carbon dioxide is a nontoxic, renewable, and abundant C1 source; whereas carboxylation of olefins to carboxylic acids represents one of the most important transformations owing to the broad applicability of these chemicals in various domains, such as water-absorbing polymers, preservatives of food, fertilizers, building blocks for the manufacturing of cosmetics, soaps, detergents, rubbers, dyes, animal feed, plastics, agrochemicals and pharmaceuticals. The present review mainly focuses on the recent advances in the transition metal-catalyzed carboxylation of the olefins by using carbon dioxide as a feedstock. Firstly, the hydrocarboxylation or direct carboxylation using coordination complexes of transition metals such as rhodium, copper, cobalt, nickel, ruthenium, iron, palladium, and zirconium have been discussed in detail. In the next section, the hetero carboxylation reactions, for example, boracarboxylation, silacarboxylation, carbocarboxylation, thiocarboxylation and dicarboxylation have been presented to explore the wider scope of CO2 utilization for carboxylation reactions. Lastly, the carboxylation of dienes and difunctionalization reactions have been discussed. Further, the recent trends and key challenges in the use of CO2 as a carbxylating agent for carboxylation reactions have been described.","PeriodicalId":9647,"journal":{"name":"Catalysis Reviews","volume":"56 1","pages":"631 - 677"},"PeriodicalIF":0.0,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74471304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-25DOI: 10.1080/01614940.2020.1831758
Yue-Hua Wu, Lei-Yang Zhang, Naixing Wang, Yalan Xing
ABSTRACT In the past three decades, rare-earth metal triflates including scandium triflate, yttrium triflate, and the lanthanide (La−Lu) triflate, were widely employed in the organic chemistry, such as cyclization, C-H bond functionalization and types of reactions. Recently, the approaches using rare-earth metal triflates as catalysts have been mainly focusing on (1) achieving the high regioselectivity and stereoselectivity with effective ligands and (2) further extending the reaction scope by cooperation with other transition metal catalysts. This review mainly focuses on recent advances in the rare-earth metal triflates-catalyzed organic reactions from 2017 to 2019. This review also emphasis on reaction transformations and related mechanisms to show the general readership about capabilities, challenges as well as potential applications.
{"title":"Recent advances in the rare-earth metal triflates-catalyzed organic reactions","authors":"Yue-Hua Wu, Lei-Yang Zhang, Naixing Wang, Yalan Xing","doi":"10.1080/01614940.2020.1831758","DOIUrl":"https://doi.org/10.1080/01614940.2020.1831758","url":null,"abstract":"ABSTRACT In the past three decades, rare-earth metal triflates including scandium triflate, yttrium triflate, and the lanthanide (La−Lu) triflate, were widely employed in the organic chemistry, such as cyclization, C-H bond functionalization and types of reactions. Recently, the approaches using rare-earth metal triflates as catalysts have been mainly focusing on (1) achieving the high regioselectivity and stereoselectivity with effective ligands and (2) further extending the reaction scope by cooperation with other transition metal catalysts. This review mainly focuses on recent advances in the rare-earth metal triflates-catalyzed organic reactions from 2017 to 2019. This review also emphasis on reaction transformations and related mechanisms to show the general readership about capabilities, challenges as well as potential applications.","PeriodicalId":9647,"journal":{"name":"Catalysis Reviews","volume":"26 1","pages":"679 - 715"},"PeriodicalIF":0.0,"publicationDate":"2020-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83243898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-15DOI: 10.1080/01614940.2020.1823788
B. Menon, Daniel M. Richmond, N. Menon
ABSTRACT Nature’s repertoire of bio-halogenase enzymes is intriguing with halogenases from various natural product biosynthetic clusters that carry out site and region-specific halogenation of diverse bioactive precursors and molecules. Currently, we have a comprehensive catalogue of cryptic and non-cryptic halogenases that act on simple to complex aliphatic and aromatic molecular scaffolds. This will open up further synthetic and biosynthetic opportunities for C-H activation, ring formation and functionalization of different molecular structures. In fact, halogenases were exploited over the years for these potential applications, to replace traditional chemical halogenation chemistries toward creating economical and environmentally benign methodologies and also for biosynthetic pathways. This review will discuss our advances in utilizing bio-halogenases to generate both in vivo and in vitro biosynthetic pathways; summarizing all naturals and non-naturals that are synthesized with a direct bio-halogenase incorporation.
{"title":"Halogenases for biosynthetic pathway engineering: Toward new routes to naturals and non-naturals","authors":"B. Menon, Daniel M. Richmond, N. Menon","doi":"10.1080/01614940.2020.1823788","DOIUrl":"https://doi.org/10.1080/01614940.2020.1823788","url":null,"abstract":"ABSTRACT Nature’s repertoire of bio-halogenase enzymes is intriguing with halogenases from various natural product biosynthetic clusters that carry out site and region-specific halogenation of diverse bioactive precursors and molecules. Currently, we have a comprehensive catalogue of cryptic and non-cryptic halogenases that act on simple to complex aliphatic and aromatic molecular scaffolds. This will open up further synthetic and biosynthetic opportunities for C-H activation, ring formation and functionalization of different molecular structures. In fact, halogenases were exploited over the years for these potential applications, to replace traditional chemical halogenation chemistries toward creating economical and environmentally benign methodologies and also for biosynthetic pathways. This review will discuss our advances in utilizing bio-halogenases to generate both in vivo and in vitro biosynthetic pathways; summarizing all naturals and non-naturals that are synthesized with a direct bio-halogenase incorporation.","PeriodicalId":9647,"journal":{"name":"Catalysis Reviews","volume":"32 1","pages":"533 - 591"},"PeriodicalIF":0.0,"publicationDate":"2020-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76529202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-18DOI: 10.1080/01614940.2020.1821443
Haotian Zhang, Siyuan Fang, Y. Hu
ABSTRACT Single-atom catalysts (SACs) have received boosting attention due to their high atom utilization and incredible activities in a wide range of catalytic processes. Numerous SACs have been investigated for CO oxidation both experimentally and theoretically, including noble-metal catalysts (Pt, Au, Pd, etc.) and non-noble-metal catalysts (Fe, Co, Ni, etc.), in which the atomically dispersed metal atoms are anchored on supports via strong metal-support interactions. This unique structure of SACs contributes to activating the adsorbed CO and O2 and stabilizing the intermediates. Electron transfer between the metal atom and the support plays an important role in tuning the electronic structure, which can greatly influence the activity, selectivity, and stability of SACs. In this review, the design principles and synthesis methods of SACs for CO oxidation are discussed with emphasis on single-atom active sites and metal-support interactions. Four CO oxidation mechanisms over SACs are evaluated. Moreover, the challenges and future research directions for SAC-catalyzed CO oxidation are outlined.
{"title":"Recent advances in single-atom catalysts for CO oxidation","authors":"Haotian Zhang, Siyuan Fang, Y. Hu","doi":"10.1080/01614940.2020.1821443","DOIUrl":"https://doi.org/10.1080/01614940.2020.1821443","url":null,"abstract":"ABSTRACT Single-atom catalysts (SACs) have received boosting attention due to their high atom utilization and incredible activities in a wide range of catalytic processes. Numerous SACs have been investigated for CO oxidation both experimentally and theoretically, including noble-metal catalysts (Pt, Au, Pd, etc.) and non-noble-metal catalysts (Fe, Co, Ni, etc.), in which the atomically dispersed metal atoms are anchored on supports via strong metal-support interactions. This unique structure of SACs contributes to activating the adsorbed CO and O2 and stabilizing the intermediates. Electron transfer between the metal atom and the support plays an important role in tuning the electronic structure, which can greatly influence the activity, selectivity, and stability of SACs. In this review, the design principles and synthesis methods of SACs for CO oxidation are discussed with emphasis on single-atom active sites and metal-support interactions. Four CO oxidation mechanisms over SACs are evaluated. Moreover, the challenges and future research directions for SAC-catalyzed CO oxidation are outlined.","PeriodicalId":9647,"journal":{"name":"Catalysis Reviews","volume":"10 1","pages":"491 - 532"},"PeriodicalIF":0.0,"publicationDate":"2020-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84957488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-17DOI: 10.1080/01614940.2020.1819936
M. Zeng, Xuejun Pan
ABSTRACT Solid acids as heterogeneous catalysts for cellulose hydrolysis have drawn increasing attention; however, current solid acids face challenges such as high catalyst loading (low catalytic activity), poor catalyst-substrate interaction, deficient hydrothermal stability, and unsatisfactory recyclability. This review critically discussed the recent efforts and progress in overcoming the issues of solid acids and developing high-performance solid acids for hydrolyzing cellulose. The key structural features of solid acids and their effects on the interactions with cellulose and cellulose hydrolysis were addressed in detail. Strategies and perspectives to enhance performance, hydrothermal stability and recyclability of solid acids were provided.
{"title":"Insights into solid acid catalysts for efficient cellulose hydrolysis to glucose: progress, challenges, and future opportunities","authors":"M. Zeng, Xuejun Pan","doi":"10.1080/01614940.2020.1819936","DOIUrl":"https://doi.org/10.1080/01614940.2020.1819936","url":null,"abstract":"ABSTRACT Solid acids as heterogeneous catalysts for cellulose hydrolysis have drawn increasing attention; however, current solid acids face challenges such as high catalyst loading (low catalytic activity), poor catalyst-substrate interaction, deficient hydrothermal stability, and unsatisfactory recyclability. This review critically discussed the recent efforts and progress in overcoming the issues of solid acids and developing high-performance solid acids for hydrolyzing cellulose. The key structural features of solid acids and their effects on the interactions with cellulose and cellulose hydrolysis were addressed in detail. Strategies and perspectives to enhance performance, hydrothermal stability and recyclability of solid acids were provided.","PeriodicalId":9647,"journal":{"name":"Catalysis Reviews","volume":"55 1","pages":"445 - 490"},"PeriodicalIF":0.0,"publicationDate":"2020-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76148527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-06DOI: 10.1080/01614940.2020.1807797
Z. H. Farooqi, R. Begum, K. Naseem, Weitai Wu, A. Irfan
ABSTRACT The usage of zero valent iron (Fe) nanoparticles for various organic transformations has been extensively reported in the last decade because of high natural abundance, low toxicity and low cost of Fe metal. The development of synthetic strategies used for fabrication of iron nanoparticles and their stabilization using various supporting materials has made a significant contribution to their use in catalysis. This critical review gives research progress of synthesis, stabilization and characterization of zero valent Fe nanoparticles. It specially emphasizes on their use as reducing agent and as catalyst in various reduction reactions in the last ten years. Catalytic reductions of different organic substrates in the presence of Fe nanoparticles using different hydrogen sources have been mainly described critically in this review. Challenges and future perspectives for further development in the field of Iron nanoparticles catalyzed reduction reactions have been described. Graphical abstract
{"title":"Zero valent iron nanoparticles as sustainable nanocatalysts for reduction reactions","authors":"Z. H. Farooqi, R. Begum, K. Naseem, Weitai Wu, A. Irfan","doi":"10.1080/01614940.2020.1807797","DOIUrl":"https://doi.org/10.1080/01614940.2020.1807797","url":null,"abstract":"ABSTRACT The usage of zero valent iron (Fe) nanoparticles for various organic transformations has been extensively reported in the last decade because of high natural abundance, low toxicity and low cost of Fe metal. The development of synthetic strategies used for fabrication of iron nanoparticles and their stabilization using various supporting materials has made a significant contribution to their use in catalysis. This critical review gives research progress of synthesis, stabilization and characterization of zero valent Fe nanoparticles. It specially emphasizes on their use as reducing agent and as catalyst in various reduction reactions in the last ten years. Catalytic reductions of different organic substrates in the presence of Fe nanoparticles using different hydrogen sources have been mainly described critically in this review. Challenges and future perspectives for further development in the field of Iron nanoparticles catalyzed reduction reactions have been described. Graphical abstract","PeriodicalId":9647,"journal":{"name":"Catalysis Reviews","volume":"13 1","pages":"286 - 355"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89421485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1080/01614940.2020.1796190
R. Goyal, Omvir Singh, Ankit Agrawal, C. Samanta, Bipul Sarkar
ABSTRACT 21st century global market place is moving towards subtainable development and without this approach our future would be at risk. Today’s chemical industries need to give more focus for the planet through improving the environmental footprints of fuels and chemicals manufacturing processes. Oxidation and hydrogenation processes are widely used in the production of chemicals and fuels. Oxidation processes are especially important to convert petroleum-based materials to useful petrochemicals of higher oxidation state. Many existing oxidation processes, however, still rely on the use of stoichiometric oxidants, such as dichromate/sulfuric acid, permanganates, periodates, chromium oxides, osmium oxide etc., and remain a major source of environmental pollution. Therefore, oxidation processes using eco-friendly oxidizing agents such as molecular oxygen, ozone and hydrogen peroxide (H2O2) are incresingly becoming important to improve the environmental sustainability. Hydrogen peroxide is especially attractive for the liquid-phase oxidation due to the presence of high percentage of active oxygen and the production of water as only by-product. As a result, H2O2-based eco-friendly oxidation processes are gradually replacing some well-established processes such as production of propylene oxide, caprolactam, phenol etc. Moreover, recent advances in the area of oxidation catalysis is promoting H2O2-based technologies to emerge as a frontline, eco-friendly sustainable processes. H2O2 is also finding greater applications in pulp/paper industries and waste water treatment as a substitute of chlorine-based oxidizing agents. Herein, we have analyzed various reactions using H2O2 as an oxidant and their recent advancement to bring important aspects of H2O2-based oxidation processes and catalysis. Moreover, various aspects of using H2O2 toward development of sustainable oxidation processes have been analyzed with respect to factors affecting the end uses in chemical industry such as efficiency, catalyst and reaction pathways. We have reviewed manufacturing trends of H2O2 and emerging applications of H2O2 in sustainable oxidation processes. Critical discussions have also been made on the opportunities and challenges with emerging H2O2 based oxidation processes in the production of bulk as well as specialty chemicals. Graphical abstract
{"title":"Advantages and limitations of catalytic oxidation with hydrogen peroxide: from bulk chemicals to lab scale process","authors":"R. Goyal, Omvir Singh, Ankit Agrawal, C. Samanta, Bipul Sarkar","doi":"10.1080/01614940.2020.1796190","DOIUrl":"https://doi.org/10.1080/01614940.2020.1796190","url":null,"abstract":"ABSTRACT 21st century global market place is moving towards subtainable development and without this approach our future would be at risk. Today’s chemical industries need to give more focus for the planet through improving the environmental footprints of fuels and chemicals manufacturing processes. Oxidation and hydrogenation processes are widely used in the production of chemicals and fuels. Oxidation processes are especially important to convert petroleum-based materials to useful petrochemicals of higher oxidation state. Many existing oxidation processes, however, still rely on the use of stoichiometric oxidants, such as dichromate/sulfuric acid, permanganates, periodates, chromium oxides, osmium oxide etc., and remain a major source of environmental pollution. Therefore, oxidation processes using eco-friendly oxidizing agents such as molecular oxygen, ozone and hydrogen peroxide (H2O2) are incresingly becoming important to improve the environmental sustainability. Hydrogen peroxide is especially attractive for the liquid-phase oxidation due to the presence of high percentage of active oxygen and the production of water as only by-product. As a result, H2O2-based eco-friendly oxidation processes are gradually replacing some well-established processes such as production of propylene oxide, caprolactam, phenol etc. Moreover, recent advances in the area of oxidation catalysis is promoting H2O2-based technologies to emerge as a frontline, eco-friendly sustainable processes. H2O2 is also finding greater applications in pulp/paper industries and waste water treatment as a substitute of chlorine-based oxidizing agents. Herein, we have analyzed various reactions using H2O2 as an oxidant and their recent advancement to bring important aspects of H2O2-based oxidation processes and catalysis. Moreover, various aspects of using H2O2 toward development of sustainable oxidation processes have been analyzed with respect to factors affecting the end uses in chemical industry such as efficiency, catalyst and reaction pathways. We have reviewed manufacturing trends of H2O2 and emerging applications of H2O2 in sustainable oxidation processes. Critical discussions have also been made on the opportunities and challenges with emerging H2O2 based oxidation processes in the production of bulk as well as specialty chemicals. Graphical abstract","PeriodicalId":9647,"journal":{"name":"Catalysis Reviews","volume":"08 1","pages":"229 - 285"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74808155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-30DOI: 10.1080/01614940.2020.1802811
Afdhal Yuda, A. Ashok, Anand Kumar
ABSTRACT The synthesis of anode electrocatalyst with high activity and durability for methanol oxidation reaction has been one of the main focuses of researchers in recent years. Several works are reviewed in this paper to summarize and compare the performance of electrocatalysts comprising of noble and non-noble metals. The effect of manipulating catalysts by introducing nanostructured morphology, metal alloys, support materials, acidic or basic electrolyte, and synthesis methods are also examined. The paper finally concludes with details of challenges that are generally faced in making direct methanol fuel cell (DMFC) a reliable source of energy for future prospects, and the approach to be taken to reduce the complexity in synthesizing new generations of anode electrocatalysts.
{"title":"A comprehensive and critical review on recent progress in anode catalyst for methanol oxidation reaction","authors":"Afdhal Yuda, A. Ashok, Anand Kumar","doi":"10.1080/01614940.2020.1802811","DOIUrl":"https://doi.org/10.1080/01614940.2020.1802811","url":null,"abstract":"ABSTRACT The synthesis of anode electrocatalyst with high activity and durability for methanol oxidation reaction has been one of the main focuses of researchers in recent years. Several works are reviewed in this paper to summarize and compare the performance of electrocatalysts comprising of noble and non-noble metals. The effect of manipulating catalysts by introducing nanostructured morphology, metal alloys, support materials, acidic or basic electrolyte, and synthesis methods are also examined. The paper finally concludes with details of challenges that are generally faced in making direct methanol fuel cell (DMFC) a reliable source of energy for future prospects, and the approach to be taken to reduce the complexity in synthesizing new generations of anode electrocatalysts.","PeriodicalId":9647,"journal":{"name":"Catalysis Reviews","volume":"1 1","pages":"126 - 228"},"PeriodicalIF":0.0,"publicationDate":"2020-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75482684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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