Nilam C. Dige, Chandrama Randive, Omkar Tamhane, Rushikesh Ghorpade, S. Kale, Prasad G Mahajan
Keeping the green chemistry approach in mind we have synthesized a novel morpholine-based ionic liquid [NBMMorph]+Br-. The structure of Ionic liquid was confirmed by spectral techniques viz. IR, 1H NMR, and 13C NMR, analysis. The synthesized novel IL [NBMMorph]+Br- was utilized to prepare 1,2,4-triazolidine-3-thiones of biological significance. The [NBMMorph]+Br- IL shows excellent catalytic activity, and a simple filtration technique can separate the thiazolidinedione products. The structure of the synthesized compounds were confirmed using IR and NMR techniques. All the synthesized compounds were screened for their antimicrobial activity. All compounds shows outstanding biological activity.
{"title":"Morpholine-Based Novel Ionic Liquid for Synthesis and Characterization of Triazolidinethiones and Their Biological Properties","authors":"Nilam C. Dige, Chandrama Randive, Omkar Tamhane, Rushikesh Ghorpade, S. Kale, Prasad G Mahajan","doi":"10.21926/cr.2301011","DOIUrl":"https://doi.org/10.21926/cr.2301011","url":null,"abstract":"Keeping the green chemistry approach in mind we have synthesized a novel morpholine-based ionic liquid [NBMMorph]<sup>+</sup>Br<sup>-</sup>. The structure of Ionic liquid was confirmed by spectral techniques <em>viz</em>. IR, <sup>1</sup>H NMR, and<sup> 13</sup>C NMR, analysis. The synthesized novel IL [NBMMorph]<sup>+</sup>Br<sup>-</sup> was utilized to prepare 1,2,4-triazolidine-3-thiones of biological significance. The [NBMMorph]<sup>+</sup>Br<sup>- </sup>IL shows excellent catalytic activity, and a simple filtration technique can separate the thiazolidinedione products. The structure of the synthesized compounds were confirmed using IR and NMR techniques. All the synthesized compounds were screened for their antimicrobial activity. All compounds shows outstanding biological activity.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127139534","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}
Vsevolod Mymrin, Kirill Alekseev, Walderson Klitzke, Daniela E. Evaniki, Cleber L Pedroso, Fernando H Passig, Karina Q Carvalho, Charles W I Haminiuk, Rodrigo E Catai
INTRODUCTION In one of his interviews, the most celebrated modern-day cosmologist, [1] said that “pollution and human “stupidity” remained the greatest threats to humankind.” He claimed that air pollution had increased 8% within the last five years, and the authors of this paper are convinced that most of that is due to municipal and industrial wastes. According to the authors of this article, the best strategic way to prevent or postpone as much as possible this global ecological tragedy, scientifically predicted by Hawking, is to replace the raw materials with industrial waste. Hawking calculated that, at the current pace, the temperature of the atmosphere would rise, leading to the death of humankind in the next 300 years. It is known that the most significant air pollutants come from industrial and municipal waste dumps. From this, it follows that scientifically based waste disposal will be a crucial factor for the survival of humanity.
{"title":"Hazardous Bauxite Red Mud and Ferrous Slag Management to Produce Sustainable Construction Materials","authors":"Vsevolod Mymrin, Kirill Alekseev, Walderson Klitzke, Daniela E. Evaniki, Cleber L Pedroso, Fernando H Passig, Karina Q Carvalho, Charles W I Haminiuk, Rodrigo E Catai","doi":"10.35702/catalres.10006","DOIUrl":"https://doi.org/10.35702/catalres.10006","url":null,"abstract":"INTRODUCTION In one of his interviews, the most celebrated modern-day cosmologist, [1] said that “pollution and human “stupidity” remained the greatest threats to humankind.” He claimed that air pollution had increased 8% within the last five years, and the authors of this paper are convinced that most of that is due to municipal and industrial wastes. According to the authors of this article, the best strategic way to prevent or postpone as much as possible this global ecological tragedy, scientifically predicted by Hawking, is to replace the raw materials with industrial waste. Hawking calculated that, at the current pace, the temperature of the atmosphere would rise, leading to the death of humankind in the next 300 years. It is known that the most significant air pollutants come from industrial and municipal waste dumps. From this, it follows that scientifically based waste disposal will be a crucial factor for the survival of humanity.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135080206","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}
Rhodamine (RhB) adsorption was carried out on MCM-41 and MCM-41 calcined. The effect of parameters such as pH was investigated. The reusability potential of MCM-41 was also established and the mechanism of RhB adsorption was discussed. MCM-41 was synthesized and calcined, with all samples characterized by X-Ray Diffractometry, X-ray Fluorescence by Dispersive Energy, Infrared Spectroscopy, Scanning Electron Microscopy, and Thermogravimetric analysis. The results of the characterization techniques performed confirmed the formation of the MCM-41 structure. During the adsorption of the RhB dye, high removal percentages and rapid kinetics occur in an acid medium. The adsorption kinetics was evaluated by two models: pseudo-first order and pseudo-second order. The pseudo-first-order kinetic model represented the interaction mechanism well during RhB adsorption by MCM-41. However, the pseudo-second-order model better represented the interaction mechanism during RhB adsorption by MCM-41 calcined. The regeneration study found that the MCM-41 and MCM-41 calcined were maintained at 80 and 90% of their original condition after three successive regeneration cycles. The overall results show that the process could be used as a strategy for environmentally sustainable wastewater treatment.
{"title":"Adsorption of Rhodamine-B (RhB) and Regeneration of MCM-41 Mesoporous Silica","authors":"Thiago Rodrigo Barbosa Barros, Thianne Silva Batista Barbosa, Tellys Lins Almeida Barbosa, Meiry Gláucia Freire Rodrigues","doi":"10.21926/cr.2301010","DOIUrl":"https://doi.org/10.21926/cr.2301010","url":null,"abstract":"Rhodamine (RhB) adsorption was carried out on MCM-41 and MCM-41 calcined. The effect of parameters such as pH was investigated. The reusability potential of MCM-41 was also established and the mechanism of RhB adsorption was discussed. MCM-41 was synthesized and calcined, with all samples characterized by X-Ray Diffractometry, X-ray Fluorescence by Dispersive Energy, Infrared Spectroscopy, Scanning Electron Microscopy, and Thermogravimetric analysis. The results of the characterization techniques performed confirmed the formation of the MCM-41 structure. During the adsorption of the RhB dye, high removal percentages and rapid kinetics occur in an acid medium. The adsorption kinetics was evaluated by two models: pseudo-first order and pseudo-second order. The pseudo-first-order kinetic model represented the interaction mechanism well during RhB adsorption by MCM-41. However, the pseudo-second-order model better represented the interaction mechanism during RhB adsorption by MCM-41 calcined. The regeneration study found that the MCM-41 and MCM-41 calcined were maintained at 80 and 90% of their original condition after three successive regeneration cycles. The overall results show that the process could be used as a strategy for environmentally sustainable wastewater treatment.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121383388","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}
V. Mymrin, Reinaldo H. G. Alarcon, Marília A. Guidolin, K. Alekseev, Rogerio J. Hultmann, Walderson Klitzke, K. Q. Carvalho, F. H. Passig, C. Haminiuk, R. E. Catai
Methanol synthesis catalyst (MSC) waste was applied as the principal component (till 70 wt.%) of sustainable ceramics in composites with bauxite processing waste (RM), and waste foundry sand (FS). The results of the initial components' chemical interaction studies by a complex of methods (XRD, SEM/EDS/mapping, AAS and LAMMA) during heating demonstrated the synthesis of amorphous glasslike new formation, their filling of pores and compaction of the ceramic’s structure. In this case, a strong chemical and mechanical binding of all heavy metals and other hazardous elements of the initial industrial waste occurs with their transfer to an insoluble in an acidic environment. The materials with the highest MSC contents have the highest axial resistance values ill 25.98 MPa after firing at 1050°C.
{"title":"Methanol Synthesis Catalyst Waste as the Principal Component of New Sustainable Cementless Concrete","authors":"V. Mymrin, Reinaldo H. G. Alarcon, Marília A. Guidolin, K. Alekseev, Rogerio J. Hultmann, Walderson Klitzke, K. Q. Carvalho, F. H. Passig, C. Haminiuk, R. E. Catai","doi":"10.21926/cr.2301009","DOIUrl":"https://doi.org/10.21926/cr.2301009","url":null,"abstract":"Methanol synthesis catalyst (MSC) waste was applied as the principal component (till 70 wt.%) of sustainable ceramics in composites with bauxite processing waste (RM), and waste foundry sand (FS). The results of the initial components' chemical interaction studies by a complex of methods (XRD, SEM/EDS/mapping, AAS and LAMMA) during heating demonstrated the synthesis of amorphous glasslike new formation, their filling of pores and compaction of the ceramic’s structure. In this case, a strong chemical and mechanical binding of all heavy metals and other hazardous elements of the initial industrial waste occurs with their transfer to an insoluble in an acidic environment. The materials with the highest MSC contents have the highest axial resistance values ill 25.98 MPa after firing at 1050°C.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127456864","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}
This work demonstrates the possibility of implementing a technology that allows profitable value to be drawn from the meat waste from retail stores. Protein hydrolysate, collagen and fatty acids were recovered from meat waste through enzymatic hydrolysis using a mixture of enzymes: a protease (Alcalase) and a lipase (Resinase). Enzymatic hydrolysis was studied by response surface methodology (RMS). Four independent variables were used to study the response variables. The analysis showed that all factors including protease/proteinic substrate ratio, lipase/lipidic substrate ratio, pH and temperature had a significant effect on responses of recovery of a protein hydrolysate, collagen, and fatty acids. From RSM-generated models, different optimum conditions were obtained depending on the product to be recovered. The economic study showed that operating profit depends on the operating conditions but that, in suitable conditions, it is four or more times higher than that obtained in the transformation of meat waste into meal for animal feed (the current destination of the meat waste that does not go to landfill). Consequently, the enzymatic treatment proposed for meat waste in this work is highly recommendable to maintain a circular economy for this biodegradable waste.
{"title":"Enzymatic Hydrolysis of Meat Waste for a Circular Economy","authors":"M. Angulo, M. C. Márquez","doi":"10.21926/cr.2301008","DOIUrl":"https://doi.org/10.21926/cr.2301008","url":null,"abstract":"This work demonstrates the possibility of implementing a technology that allows profitable value to be drawn from the meat waste from retail stores. Protein hydrolysate, collagen and fatty acids were recovered from meat waste through enzymatic hydrolysis using a mixture of enzymes: a protease (Alcalase) and a lipase (Resinase). Enzymatic hydrolysis was studied by response surface methodology (RMS). Four independent variables were used to study the response variables. The analysis showed that all factors including protease/proteinic substrate ratio, lipase/lipidic substrate ratio, pH and temperature had a significant effect on responses of recovery of a protein hydrolysate, collagen, and fatty acids. From RSM-generated models, different optimum conditions were obtained depending on the product to be recovered. The economic study showed that operating profit depends on the operating conditions but that, in suitable conditions, it is four or more times higher than that obtained in the transformation of meat waste into meal for animal feed (the current destination of the meat waste that does not go to landfill). Consequently, the enzymatic treatment proposed for meat waste in this work is highly recommendable to maintain a circular economy for this biodegradable waste.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"127 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129907616","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}
Sadeq Hamood Saleh Azzam, Amreen Khanum, M. A. Pasha
2-Phenyl-4-arylmethylidene-5-oxazolinones were synthesized in very high yield by subjecting a mixture of an aryl aldehyde/heterocyclic aldehyde/cinnamaldehyde and hippuric acid in anhydrous acetic anhydride and catalytic Zn(OCOCH3)2·2H2O to ultrasonication at 35 KHz for 4 to 8 min. This method has many advantages: use of a green catalyst; yields are high, involves easy workup procedure, is energy efficient and economically feasible.
{"title":"Zn(OCOCH3)2·2H2O Catalysed Efficient Preparation of 2-Phenyl-4-Arylmethylidene-5-Oxazolinones under Ultrasonic Condition","authors":"Sadeq Hamood Saleh Azzam, Amreen Khanum, M. A. Pasha","doi":"10.21926/cr.2301007","DOIUrl":"https://doi.org/10.21926/cr.2301007","url":null,"abstract":"2-Phenyl-4-arylmethylidene-5-oxazolinones were synthesized in very high yield by subjecting a mixture of an aryl aldehyde/heterocyclic aldehyde/cinnamaldehyde and hippuric acid in anhydrous acetic anhydride and catalytic Zn(OCOCH<sub>3</sub>)<sub>2</sub><strong>·</strong>2H<sub>2</sub>O to ultrasonication at 35 KHz for 4 to 8 min. This method has many advantages: use of a green catalyst; yields are high, involves easy workup procedure, is energy efficient and economically feasible.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117132333","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}
Recently the GexOy nanomaterials have been studied intensively due to their interesting electronic materials, which have many particular properties and applications in nanotechnology and nano-devices fabrication. Much work has been done on many different synthesis methods and their properties of Ge and GexOy nanomaterials. However, the effects of the different Ge substrate surface states and Au catalyst layer thicknesses on the formation of different forms/morphologies of nanomaterials (nanowires, nanorods, nanoparticles, and nanocrystals particularly) have yet to be discussed more in detail. This paper outlines the synthesis methods to grow the different GexOy nanomaterials on the different Ge surface states at different Au catalyst layer thicknesses such as mechanically polished surface, deep Chemical etched surface, chemical polishing surface, and initial rough surface. The morphological, and structural properties of GexOy nanomaterials have been investigated using SEM, EDX, and TEM techniques. The formation of different morphological, and structural properties of different GexOy nanomaterials grown have been explained by the effects of the Au/Ge/O droplets/clusters formation situations and surface defects on the Ge substrate surface caused. The growth mechanisms have been explained by the model of the VLS growth method with the Oxide Assist Growth mechanism. The results showed that the effects of the different Ge substrate surface states and Au catalyst layers’ thickness strongly influence the formation of GexOy materials in terms of the sizes, structures, and percentages of elements. The results of the controllable different GexOy nanomaterials have many significant meanings for both theoretical and practical applications in nanomaterials and nano-device fabrication.
{"title":"The Effects of Ge Substrate Surface States and Au Catalyst Layer Thickness on the Growth of Different GexOy Nanomaterials and Nanocrystals Configurations Using Vapor-Liquid-Solid Method with two Steps Temperature Mode","authors":"Khac An Dao, H. T. Pham, V. V. Hoang","doi":"10.21926/cr.2301006","DOIUrl":"https://doi.org/10.21926/cr.2301006","url":null,"abstract":"Recently the GexOy nanomaterials have been studied intensively due to their interesting electronic materials, which have many particular properties and applications in nanotechnology and nano-devices fabrication. Much work has been done on many different synthesis methods and their properties of Ge and GexOy nanomaterials. However, the effects of the different Ge substrate surface states and Au catalyst layer thicknesses on the formation of different forms/morphologies of nanomaterials (nanowires, nanorods, nanoparticles, and nanocrystals particularly) have yet to be discussed more in detail. This paper outlines the synthesis methods to grow the different GexOy nanomaterials on the different Ge surface states at different Au catalyst layer thicknesses such as mechanically polished surface, deep Chemical etched surface, chemical polishing surface, and initial rough surface. The morphological, and structural properties of GexOy nanomaterials have been investigated using SEM, EDX, and TEM techniques. The formation of different morphological, and structural properties of different GexOy nanomaterials grown have been explained by the effects of the Au/Ge/O droplets/clusters formation situations and surface defects on the Ge substrate surface caused. The growth mechanisms have been explained by the model of the VLS growth method with the Oxide Assist Growth mechanism. The results showed that the effects of the different Ge substrate surface states and Au catalyst layers’ thickness strongly influence the formation of GexOy materials in terms of the sizes, structures, and percentages of elements. The results of the controllable different GexOy nanomaterials have many significant meanings for both theoretical and practical applications in nanomaterials and nano-device fabrication.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131154840","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}
{"title":"Insights into Metallic Ag+, Cu2+, Zn2+ Ions-Induced Bacteriolytic Mechanism against S. Aureus and E. Coli","authors":"T. Ishida","doi":"10.35702/catalres.10005","DOIUrl":"https://doi.org/10.35702/catalres.10005","url":null,"abstract":"","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129301509","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}
Stamatia Spyrou, A. Chatzikonstantinou, A. Giannakopoulou, Renia Fotiadou, Silvia Priska, Y. Simos, Aliki Tsakni, D. Peschos, Dimitra P. Houhoula, E. Voutsas, H. Stamatis
Biomass derived from green marine macroalgae Ulva sp. is considered a rich source of bioactive compounds. In the present study, we demonstrate the increased bioactivity of a phenolic-rich extract derived from green marine macroalgae Ulva intestinalis after its treatment with fungal laccases from Trametes versicolor and Agaricus bisporus. The phenolic composition of the extract, before and after its enzymatic treatment, was determined through several analytical methods. Furthermore, the antioxidant, enzyme-inhibitory, antimicrobial and cytotoxic activity of enzymatically modified and non-modified extracts was comparatively investigated. Depending on the laccase used, the enzyme-modified extracts exhibited different phenolic content and enhanced bioactivities compared to the non-treated ones. The enzymatically modified extracts presented enhanced antimicrobial, anti-lipoxygenase and anti-collagenase activities, and mild cytotoxicity. These results indicate that the proposed biocatalytic process could be applied to produce green macroalgal natural extracts with enhanced bioactivities paving the way for their implementation in the food, pharmaceutical, and cosmeceutical industries.
{"title":"Fungal Laccase-Mediated Enhancement of the Bioactivity of Green Algae Extracts","authors":"Stamatia Spyrou, A. Chatzikonstantinou, A. Giannakopoulou, Renia Fotiadou, Silvia Priska, Y. Simos, Aliki Tsakni, D. Peschos, Dimitra P. Houhoula, E. Voutsas, H. Stamatis","doi":"10.21926/cr.2301004","DOIUrl":"https://doi.org/10.21926/cr.2301004","url":null,"abstract":"Biomass derived from green marine macroalgae Ulva sp. is considered a rich source of bioactive compounds. In the present study, we demonstrate the increased bioactivity of a phenolic-rich extract derived from green marine macroalgae Ulva intestinalis after its treatment with fungal laccases from Trametes versicolor and Agaricus bisporus. The phenolic composition of the extract, before and after its enzymatic treatment, was determined through several analytical methods. Furthermore, the antioxidant, enzyme-inhibitory, antimicrobial and cytotoxic activity of enzymatically modified and non-modified extracts was comparatively investigated. Depending on the laccase used, the enzyme-modified extracts exhibited different phenolic content and enhanced bioactivities compared to the non-treated ones. The enzymatically modified extracts presented enhanced antimicrobial, anti-lipoxygenase and anti-collagenase activities, and mild cytotoxicity. These results indicate that the proposed biocatalytic process could be applied to produce green macroalgal natural extracts with enhanced bioactivities paving the way for their implementation in the food, pharmaceutical, and cosmeceutical industries.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115267182","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}
J. Ribeiro, Ronaldo S. Silva, Giancarlo Richard Salazar Banda, K. Eguiluz
This paper describes the synthesis of Pd0.70-Nix-By nanoparticles (x:y = 0.30:0, 0:0.30, 0.25:0.05, 0.20:0.10, 0.15:0.15, and 0.10:0.20) supported on carbon Vulcan XC-72 R by the chemical reduction method using ethylene glycol as a reducing agent for the study of the electrochemical oxidation of ethanol in alkaline media. Neither surfactants nor templates were used during the syntheses. The catalysts were physically characterized by transmission electron microscopy that showed the formation of nanoparticles with diameters of approximately 3 nm. Analyses of X-ray dispersive energy spectroscopy coupled with scanning electron microscopy identified the presence of the synthesized metals in concentrations close to the nominal ones. The electrochemical study was performed by CO-stripping, cyclic voltammetry, chronoamperometry, and steady-state polarization curves. The catalytic efficiency was also evaluated against the oxidation of CO, which is the principal intermediate adsorbed on the surface of catalysts during ethanol oxidation. The Pd0.70Ni0.15B0.15/C catalyst showed the lowest oxidation onset potentials for both CO (0.37 V) and ethanol oxidation (0.51 V) compared with the Pd/C catalyst (0.63 V and 0.64 V). Chronoamperometric tests also revealed that the Pd0.70Ni0.15B0.15/C catalyst displayed current densities four times higher than those of the Pd/C catalyst, probably because of the electronic and geometric effect that favors the removal of intermediate species from the catalyst surface. The synthesized ternary catalysts were more efficient toward the electrochemical oxidation of ethanol in alkaline media than Pd0.7Ni0.3/C and Pd/C catalysts. Thus, the synergistic effect of boron on the structure of binary nanoparticle catalysts supported on carbon for use in direct alcohol fuel cells was demonstrated for the first time.
{"title":"Pd-Ni-B/C Nanocatalysts for Electrochemical Oxidation of Ethanol in Alkaline Media","authors":"J. Ribeiro, Ronaldo S. Silva, Giancarlo Richard Salazar Banda, K. Eguiluz","doi":"10.21926/cr.2301005","DOIUrl":"https://doi.org/10.21926/cr.2301005","url":null,"abstract":"This paper describes the synthesis of Pd0.70-Nix-By nanoparticles (x:y = 0.30:0, 0:0.30, 0.25:0.05, 0.20:0.10, 0.15:0.15, and 0.10:0.20) supported on carbon Vulcan XC-72 R by the chemical reduction method using ethylene glycol as a reducing agent for the study of the electrochemical oxidation of ethanol in alkaline media. Neither surfactants nor templates were used during the syntheses. The catalysts were physically characterized by transmission electron microscopy that showed the formation of nanoparticles with diameters of approximately 3 nm. Analyses of X-ray dispersive energy spectroscopy coupled with scanning electron microscopy identified the presence of the synthesized metals in concentrations close to the nominal ones. The electrochemical study was performed by CO-stripping, cyclic voltammetry, chronoamperometry, and steady-state polarization curves. The catalytic efficiency was also evaluated against the oxidation of CO, which is the principal intermediate adsorbed on the surface of catalysts during ethanol oxidation. The Pd0.70Ni0.15B0.15/C catalyst showed the lowest oxidation onset potentials for both CO (0.37 V) and ethanol oxidation (0.51 V) compared with the Pd/C catalyst (0.63 V and 0.64 V). Chronoamperometric tests also revealed that the Pd0.70Ni0.15B0.15/C catalyst displayed current densities four times higher than those of the Pd/C catalyst, probably because of the electronic and geometric effect that favors the removal of intermediate species from the catalyst surface. The synthesized ternary catalysts were more efficient toward the electrochemical oxidation of ethanol in alkaline media than Pd0.7Ni0.3/C and Pd/C catalysts. Thus, the synergistic effect of boron on the structure of binary nanoparticle catalysts supported on carbon for use in direct alcohol fuel cells was demonstrated for the first time.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125031310","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：