Pub Date : 2020-06-14DOI: 10.2174/2211544709999200614165508
J. Tiwari, Swastika Singh, D. Jaiswal, A. Sharma, Shailesh Singh, Jaya Singh, Jagdamba Singh
We have developed an efficient, novel one-pot multicomponent protocol for the synthesis of hexahydro-4H-indazol-4-onederivatives using β-cyclodextrin as a biomimetic catalyst in an aqueous medium. To the best of our knowledge, the targeted molecules have not been reported in the literature till now. The present method is very effective for our densely functionalized and diversified targeted molecules and includes several advantages like environment benign, cost-effectiveness, short reaction times, high yields and recyclability of the catalyst.
{"title":"Supramolecular Catalysis: An Efficient and Sustainable Multicomponent Approach to the Synthesis of Novel Hexahydro-4H-indazol-4-one Derivatives","authors":"J. Tiwari, Swastika Singh, D. Jaiswal, A. Sharma, Shailesh Singh, Jaya Singh, Jagdamba Singh","doi":"10.2174/2211544709999200614165508","DOIUrl":"https://doi.org/10.2174/2211544709999200614165508","url":null,"abstract":"\u0000\u0000We have developed an efficient, novel one-pot multicomponent protocol for the synthesis\u0000of hexahydro-4H-indazol-4-onederivatives using β-cyclodextrin as a biomimetic catalyst in an aqueous\u0000medium. To the best of our knowledge, the targeted molecules have not been reported in the literature\u0000till now. The present method is very effective for our densely functionalized and diversified targeted\u0000molecules and includes several advantages like environment benign, cost-effectiveness, short\u0000reaction times, high yields and recyclability of the catalyst.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"7 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2020-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88834175","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 : 2020-04-30DOI: 10.2174/2211544709999200430003940
S. Lycourghiotis, Dimitra Makarouni, Eleana Kordouli, K. Bourikas, C. Kordulis, V. Dourtoglou
The influence of air–calcination (500oC for 2h) on the physicochemical properties of natural mordenite and mordenite activated by aqueous solutions of several acids, has been studied through various methods. Calcination does not affect the crystal structure of the samples and their fibrous and pores morphology. In contrast, it causes a drastic decrease in the high Bronsted acidity of the acidactivated samples, which was tentatively attributed to the partial destruction of the very strong Al– (OH)–Si acid sites. The influence of calcination on the texture is different depending on the acidic solution used for mordenite activation. The high specific surface area and the moderate acidity obtained after calcination of the sample activated by HCl render this material quite attractive support for the development of nickel supported catalysts for green diesel production.
{"title":"The Influence of Calcination on the Physicochemical Properties of Acidactivated Natural Mordenite","authors":"S. Lycourghiotis, Dimitra Makarouni, Eleana Kordouli, K. Bourikas, C. Kordulis, V. Dourtoglou","doi":"10.2174/2211544709999200430003940","DOIUrl":"https://doi.org/10.2174/2211544709999200430003940","url":null,"abstract":"\u0000\u0000The influence of air–calcination (500oC for 2h) on the physicochemical properties of natural\u0000mordenite and mordenite activated by aqueous solutions of several acids, has been studied through\u0000various methods. Calcination does not affect the crystal structure of the samples and their fibrous and\u0000pores morphology. In contrast, it causes a drastic decrease in the high Bronsted acidity of the acidactivated\u0000samples, which was tentatively attributed to the partial destruction of the very strong Al–\u0000(OH)–Si acid sites. The influence of calcination on the texture is different depending on the acidic solution\u0000used for mordenite activation. The high specific surface area and the moderate acidity obtained\u0000after calcination of the sample activated by HCl render this material quite attractive support for the\u0000development of nickel supported catalysts for green diesel production.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76811394","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 : 2020-02-29DOI: 10.2174/2211544708666190902124817
Debabrata Chatterjee and Rudi van Edik
Reduction of carbon dioxide into formic acid using transition metal complexes as catalysts is a research area of abiding importance. Although ruthenium(II) complexes as ‘molecular catalysts’ have received much attention, use of ruthenium(III) complexes in the selective reduction of carbon dioxide into formic acid has recently been explored. This review focuses on the recent research progress in the use of a ruthenium(III) complex containing the ‘edta’ ligand (edta4- = ethylenediaminetetraacetate) as catalyst or mediator in the catalytic, electro-catalytic and photocatalytic conversion of bicarbonate to formate selectively. Details of the reaction mechanism pertaining to the overall catalytic process are discussed.
{"title":"Prospect of RuIII(edta) in Catalysis of Bicarbonate Reduction","authors":"Debabrata Chatterjee and Rudi van Edik","doi":"10.2174/2211544708666190902124817","DOIUrl":"https://doi.org/10.2174/2211544708666190902124817","url":null,"abstract":"\u0000\u0000Reduction of carbon dioxide into formic acid using transition metal complexes as catalysts\u0000is a research area of abiding importance. Although ruthenium(II) complexes as ‘molecular catalysts’\u0000have received much attention, use of ruthenium(III) complexes in the selective reduction of carbon dioxide\u0000into formic acid has recently been explored. This review focuses on the recent research progress\u0000in the use of a ruthenium(III) complex containing the ‘edta’ ligand (edta4- = ethylenediaminetetraacetate)\u0000as catalyst or mediator in the catalytic, electro-catalytic and photocatalytic conversion of bicarbonate\u0000to formate selectively. Details of the reaction mechanism pertaining to the overall catalytic\u0000process are discussed.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"14 1","pages":"23-31"},"PeriodicalIF":0.0,"publicationDate":"2020-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81783909","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 : 2020-02-29DOI: 10.2174/2211544708666190423130340
Juliana F. Gonçalves and Mariana M.V.M. Souza
Hydrogen has been considered the energy source of the future and one of the processes for its production is the methane steam reforming. The catalyst used industrially is Ni/Al2O3 and the addition of promoter oxides can be an alternative to improve the performance of this catalyst, which suffers from coke formation and sintering. Evaluate the role of niobia on catalytic activity and stability. Ni/x%Nb2O5/Al2O3 (x = 5, 10 and 20) catalysts were synthesized via coprecipitation-wet impregnation method and characterized by X-ray fluorescence (XRF), N2 adsorption-desorption, X-ray diffraction (XRD), temperature- programmed reduction (TPR), temperature-programmed desorption of ammonia (TPD-NH3), etc. Finally, the catalysts were tested for methane steam reforming reaction. All niobia-doped catalysts presented similar values of methane conversion and when comparing with Ni-Al, the addition of niobia slightly improved the methane conversion. In the stability test at 800oC, all doped and non-doped catalysts did not deactivate during the 24 h of reaction. The addition of 10 and 20 wt.% of niobia had a significant promoter effect over Ni/Al2O3 catalyst in terms of activity and stability at 800 oC and the sample with 20 wt.% of niobia presented lower coke formation.
{"title":"Ni/x%Nb2O5/Al2O3 Catalysts Prepared via Coprecipitation-Wet Impregnation Method for Methane Steam Reforming","authors":"Juliana F. Gonçalves and Mariana M.V.M. Souza","doi":"10.2174/2211544708666190423130340","DOIUrl":"https://doi.org/10.2174/2211544708666190423130340","url":null,"abstract":"\u0000\u0000Hydrogen has been considered the energy source of the future and one of the\u0000processes for its production is the methane steam reforming. The catalyst used industrially is Ni/Al2O3\u0000and the addition of promoter oxides can be an alternative to improve the performance of this catalyst,\u0000which suffers from coke formation and sintering.\u0000\u0000\u0000\u0000Evaluate the role of niobia on catalytic activity and stability.\u0000\u0000\u0000\u0000Ni/x%Nb2O5/Al2O3 (x = 5, 10 and 20) catalysts were synthesized via coprecipitation-wet impregnation\u0000method and characterized by X-ray fluorescence (XRF), N2 adsorption-desorption, X-ray diffraction\u0000(XRD), temperature- programmed reduction (TPR), temperature-programmed desorption of\u0000ammonia (TPD-NH3), etc. Finally, the catalysts were tested for methane steam reforming reaction.\u0000\u0000\u0000\u0000 All niobia-doped catalysts presented similar values of methane conversion and when comparing\u0000with Ni-Al, the addition of niobia slightly improved the methane conversion. In the stability test at\u0000800oC, all doped and non-doped catalysts did not deactivate during the 24 h of reaction.\u0000\u0000\u0000\u0000 The addition of 10 and 20 wt.% of niobia had a significant promoter effect over Ni/Al2O3\u0000catalyst in terms of activity and stability at 800 oC and the sample with 20 wt.% of niobia presented\u0000lower coke formation.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"276 1","pages":"80-89"},"PeriodicalIF":0.0,"publicationDate":"2020-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76984740","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 : 2020-02-29DOI: 10.2174/2211544708666190613163523
Radhika Yadav
In this review, different heterogeneous catalysts based on acid, base, metal and enzymes are discussed for the synthesis of industrially relevant perfumes and flavor compounds. These molecules are mainly produced by a variety of reaction pathways such as esterification, isomerization, hydration, alkylation, hydrogenation, oxidation, etc. All these reactions are discussed thoroughly for the synthesis of vital aromatic compounds. The review also summarizes various recent technologies applied for designing new catalysts to obtain the maximum yield of the desired product. Overall, this review highlights the green, clean and eco-friendly processes which can be industrially accepted for the synthesis of perfumes, flavors and fragrances. The objective of the current review was to emphasize on the synthesis of industrially important perfumes and flavor molecules such as α-terpineol, cyclohexyl esters, thymol, raspberry ketone, etc. using heterogeneous catalysts. Three hundred and eight papers are reported in this review, the majority of which are on heterogeneous catalysis for the synthesis of molecules which impart flavor or possess perfumery characteristics. Among all, the preparation of esters is highlighted as they represent an imperative functional group in aroma chemicals. The review confirms the need for heterogeneous catalysis in pollution-free and costeffective synthesis of flavor and perfumery compounds.
{"title":"Development of Green and Clean Processes for Perfumes and Flavors Using Heterogeneous Chemical Catalysis","authors":"Radhika Yadav","doi":"10.2174/2211544708666190613163523","DOIUrl":"https://doi.org/10.2174/2211544708666190613163523","url":null,"abstract":"\u0000\u0000In this review, different heterogeneous catalysts based on acid, base, metal\u0000and enzymes are discussed for the synthesis of industrially relevant perfumes and flavor compounds.\u0000These molecules are mainly produced by a variety of reaction pathways such as esterification, isomerization,\u0000hydration, alkylation, hydrogenation, oxidation, etc. All these reactions are discussed thoroughly\u0000for the synthesis of vital aromatic compounds. The review also summarizes various recent\u0000technologies applied for designing new catalysts to obtain the maximum yield of the desired product.\u0000Overall, this review highlights the green, clean and eco-friendly processes which can be industrially\u0000accepted for the synthesis of perfumes, flavors and fragrances.\u0000\u0000\u0000\u0000The objective of the current review was to emphasize on the synthesis of industrially important\u0000perfumes and flavor molecules such as α-terpineol, cyclohexyl esters, thymol, raspberry ketone,\u0000etc. using heterogeneous catalysts.\u0000\u0000\u0000\u0000Three hundred and eight papers are reported in this review, the majority of which are on heterogeneous\u0000catalysis for the synthesis of molecules which impart flavor or possess perfumery characteristics.\u0000Among all, the preparation of esters is highlighted as they represent an imperative functional\u0000group in aroma chemicals.\u0000\u0000\u0000\u0000 The review confirms the need for heterogeneous catalysis in pollution-free and costeffective\u0000synthesis of flavor and perfumery compounds.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"42 3","pages":"32-58"},"PeriodicalIF":0.0,"publicationDate":"2020-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91453617","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 : 2019-03-31DOI: 10.2174/2211544708666190124112830
M. Ventura, M. Domine, Marvin Chávez-Sifontes
Valorization of lignocellulosic biomass becomes a sustainable alternative against the constant depletion and environmental problems of fossil sources necessary for the production of chemicals and fuels. In this context, a wide range of renewable raw materials can be obtained from lignocellulosic biomass in both polymeric (i.e. cellulose, starch, lignin) and monomeric (i.e. sugars, polyols, phenols) forms. Lignin and its derivatives are interesting platform chemicals for industry, although mainly due to its refractory characteristics its use has been less considered compared to other biomass fractions. To take advantage of the potentialities of lignin, it is necessary to isolate it from the cellulose/ hemicellulosic fraction, and then apply depolymerization processes; the overcoming of technical limitations being a current issue of growing interest for many research groups. In this review, significant data related to the structural characteristics of different types of commercial lignins are presented, also including extraction and isolation processes from biomass, and industrial feedstocks obtained as residues from paper industry under different treatments. The review mainly focuses on the different depolymerization processes (hydrolysis, hydrogenolysis, hydrodeoxygenation, pyrolysis) up to now developed and investigated analyzing the different hydrocarbons and aromatic derivatives obtained in each case, as well as the interesting reactions some of them may undergo. Special emphasis is done on the development of new catalysts and catalytic processes for the efficient production of fuels and chemicals from lignin. The possibilities of applications for lignin and its derivatives in new industrial processes and their integration into the biorefinery of the future are also assessed.
{"title":"Catalytic Processes For Lignin Valorization into Fuels and Chemicals (Aromatics)","authors":"M. Ventura, M. Domine, Marvin Chávez-Sifontes","doi":"10.2174/2211544708666190124112830","DOIUrl":"https://doi.org/10.2174/2211544708666190124112830","url":null,"abstract":"\u0000\u0000Valorization of lignocellulosic biomass becomes a sustainable alternative against the constant\u0000depletion and environmental problems of fossil sources necessary for the production of chemicals\u0000and fuels. In this context, a wide range of renewable raw materials can be obtained from lignocellulosic\u0000biomass in both polymeric (i.e. cellulose, starch, lignin) and monomeric (i.e. sugars, polyols,\u0000phenols) forms. Lignin and its derivatives are interesting platform chemicals for industry, although\u0000mainly due to its refractory characteristics its use has been less considered compared to other biomass\u0000fractions. To take advantage of the potentialities of lignin, it is necessary to isolate it from the cellulose/\u0000hemicellulosic fraction, and then apply depolymerization processes; the overcoming of technical\u0000limitations being a current issue of growing interest for many research groups. In this review, significant\u0000data related to the structural characteristics of different types of commercial lignins are presented,\u0000also including extraction and isolation processes from biomass, and industrial feedstocks obtained as\u0000residues from paper industry under different treatments. The review mainly focuses on the different\u0000depolymerization processes (hydrolysis, hydrogenolysis, hydrodeoxygenation, pyrolysis) up to now\u0000developed and investigated analyzing the different hydrocarbons and aromatic derivatives obtained in\u0000each case, as well as the interesting reactions some of them may undergo. Special emphasis is done on\u0000the development of new catalysts and catalytic processes for the efficient production of fuels and\u0000chemicals from lignin. The possibilities of applications for lignin and its derivatives in new industrial\u0000processes and their integration into the biorefinery of the future are also assessed.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"56 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74626901","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 : 2019-03-31DOI: 10.2174/2211544708666181227152000
V. Coman
Core-magnetic composites offer unique possibilities to accommodate adequate amounts of acid-base and redox functional sites and hence to catalyze the biomass conversion reactions in a one-pot way. Moreover, due to the dual functionality, the core-magnetic composites provide a bridge between homogeneous and heterogeneous catalysis. Hence, this minireview aims to offer a comprehensive account of remarkable recent applications of core-magnetic composites in the catalytic processes for biomass valorization. A critical evaluation of synthetic methodologies utilized for the production of the magnetic nanoparticles, characterization techniques and catalytic applications is provided. The benefits of their utilization are exemplified by most representative examples of one-pot transformation of cellulose and upgrading processes. Other recent examples constitute the lignin fragmentation on magnetic iron oxide-based catalysts and the renewable crude glycerol up-grading using core-shell magnetic iron oxide bio-based materials. The review provides important information on the distinctive properties of the functionalized core-magnetic composites. Moreover, this review offers useful information affording a largescale production development, in terms of catalyst and reaction conditions, tailoring selectivity, and the potential to regenerate the catalysts.
{"title":"Core-Magnetic Composites Catalysts for the Valorization and Up-grading of the Renewable Feedstocks: A Minireview","authors":"V. Coman","doi":"10.2174/2211544708666181227152000","DOIUrl":"https://doi.org/10.2174/2211544708666181227152000","url":null,"abstract":"\u0000\u0000Core-magnetic composites offer unique possibilities to accommodate adequate\u0000amounts of acid-base and redox functional sites and hence to catalyze the biomass conversion\u0000reactions in a one-pot way. Moreover, due to the dual functionality, the core-magnetic composites\u0000provide a bridge between homogeneous and heterogeneous catalysis. Hence, this minireview aims to\u0000offer a comprehensive account of remarkable recent applications of core-magnetic composites in the\u0000catalytic processes for biomass valorization.\u0000\u0000\u0000\u0000 A critical evaluation of synthetic methodologies utilized for the production of the magnetic\u0000nanoparticles, characterization techniques and catalytic applications is provided.\u0000\u0000\u0000\u0000The benefits of their utilization are exemplified by most representative examples of one-pot\u0000transformation of cellulose and upgrading processes. Other recent examples constitute the lignin\u0000fragmentation on magnetic iron oxide-based catalysts and the renewable crude glycerol up-grading\u0000using core-shell magnetic iron oxide bio-based materials.\u0000\u0000\u0000\u0000The review provides important information on the distinctive properties of the functionalized\u0000core-magnetic composites. Moreover, this review offers useful information affording a largescale\u0000production development, in terms of catalyst and reaction conditions, tailoring selectivity, and\u0000the potential to regenerate the catalysts.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86514230","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 : 2019-03-31DOI: 10.2174/2211544708666181129100631
A. Mukherjee, Mrinal K. Adak, A. Chowdhury, D. Dhak
To prevent the environmental pollution, the release of the carcinogenic reagents like nitroarenes, especially nitrobenzene must be reduced or to find a way to convert these hazardous materials into less harmful material. For the reduction of nitroarenes, various types of catalysts such as metal nanoparticles (mainly coinage and group VIII) and platinum group metals were used. The chemo/homo selectivity of the reduction of nitroarenes was tested mainly in an organic solvent medium. Trimetallic oxide nanocatalysts were prepared chemically and characterized via Thermogravimetric analysis (TGA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy FTIR), Scanning electron microscope (SEM) and solid UV studies. A series of nitroarenes were subjected to get their amine analogues using the NaBH4 in an aqueous medium using the synthesized catalysts. The completion of the reduction process was confirmed by the spectroscopic analysis. The average crystallite of the trimetallic oxide nanocatalysts was found to be 14-32nm. The reductions were selective (homo/chemo) and kinetics followed the Lindemann-Hinshelwood pseudofirst order kinetics with the rate constant in the order of 10-3 s-1. Hydroxylamine intermediate was found to be formed in the reduction procedure. The catalysts showed promising for the selectivity (homo/chemo). The reduction processes were less time consuming e.g. nitrobenzene took 10 mins and a series of nitroanilines required 35-40 s for the reduction. In short, the trimetallic nano-oxide catalysts possess fast reaction process, cost-effective, easy to handle, reusable and hence could be promising for industrial waste treatment.
{"title":"Synthesis of Cost-effective Trimetallic Oxide Nanocatalysts for the Reduction of Nitroarenes in Presence of NaBH4 in an Aqueous Medium","authors":"A. Mukherjee, Mrinal K. Adak, A. Chowdhury, D. Dhak","doi":"10.2174/2211544708666181129100631","DOIUrl":"https://doi.org/10.2174/2211544708666181129100631","url":null,"abstract":"\u0000\u0000To prevent the environmental pollution, the release of the carcinogenic\u0000reagents like nitroarenes, especially nitrobenzene must be reduced or to find a way to convert these\u0000hazardous materials into less harmful material. For the reduction of nitroarenes, various types of\u0000catalysts such as metal nanoparticles (mainly coinage and group VIII) and platinum group metals were\u0000used. The chemo/homo selectivity of the reduction of nitroarenes was tested mainly in an organic\u0000solvent medium.\u0000\u0000\u0000\u0000Trimetallic oxide nanocatalysts were prepared chemically and characterized via Thermogravimetric\u0000analysis (TGA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy FTIR),\u0000Scanning electron microscope (SEM) and solid UV studies. A series of nitroarenes were subjected to\u0000get their amine analogues using the NaBH4 in an aqueous medium using the synthesized catalysts. The\u0000completion of the reduction process was confirmed by the spectroscopic analysis.\u0000\u0000\u0000\u0000The average crystallite of the trimetallic oxide nanocatalysts was found to be 14-32nm. The\u0000reductions were selective (homo/chemo) and kinetics followed the Lindemann-Hinshelwood pseudofirst\u0000order kinetics with the rate constant in the order of 10-3 s-1. Hydroxylamine intermediate was\u0000found to be formed in the reduction procedure.\u0000\u0000\u0000\u0000The catalysts showed promising for the selectivity (homo/chemo). The reduction processes\u0000were less time consuming e.g. nitrobenzene took 10 mins and a series of nitroanilines required\u000035-40 s for the reduction. In short, the trimetallic nano-oxide catalysts possess fast reaction process,\u0000cost-effective, easy to handle, reusable and hence could be promising for industrial waste treatment.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79730793","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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