Total oxidation of dichloromethane and ethanol over ceria–zirconia mixed oxide supported platinum and gold catalysts

•Pt/CeZr and Au/CeZr catalysts tested in dichloromethane and ethanol total oxidation.•Catalytic activity in dichloromethane oxidation: CeZr>Pt/CeZr>Au/CeZr.•Au/CeZr with higher Au loading less active in DCM oxidation due to large Au particles.•Catalytic activity in ethanol oxidation: Pt/CeZr&g...

Celý popis

Uloženo v:
Podrobná bibliografie
Vydáno v:Applied catalysis. B, Environmental Ročník 142-143; s. 54 - 64
Hlavní autoři: Matějová, Lenka, Topka, Pavel, Kaluža, Luděk, Pitkäaho, Satu, Ojala, Satu, Gaálová, Jana, Keiski, Riitta L.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Kidlington Elsevier B.V 01.10.2013
Elsevier
Témata:
Catalysis
Catalysts
Ceria
Chemistry
Ethanol
Ethyl alcohol
Exact sciences and technology
General and physical chemistry
Gold
Noble metals
Oxidation
Platinum
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
VOC oxidation
Zirconia
Zirconia
Gold
VOC oxidation
Platinum
Ceria
Binary compound
Ethanol
Support
Transition element compounds
Alcohol
Transition metal
Cerium oxide
Lanthanide compound
Chlorine compounds
Heterogeneous catalysis
Alkanol
Dichloromethane
Oxidation
Catalyst
Environmental protection
ISSN:0926-3373, 1873-3883
On-line přístup:Získat plný text
Tagy: Přidat tag
Žádné tagy, Buďte první, kdo vytvoří štítek k tomuto záznamu!
Popis
Shrnutí:•Pt/CeZr and Au/CeZr catalysts tested in dichloromethane and ethanol total oxidation.•Catalytic activity in dichloromethane oxidation: CeZr>Pt/CeZr>Au/CeZr.•Au/CeZr with higher Au loading less active in DCM oxidation due to large Au particles.•Catalytic activity in ethanol oxidation: Pt/CeZr>Au/CeZr>CeZr.•The influence of Pt loading on the mechanism of ethanol oxidation was revealed. Ce0.5Zr0.5O2 prepared by sol–gel method was used as a support for platinum and gold catalysts that were tested in total oxidation of dichloromethane and ethanol. It was shown that the deposition of platinum and gold on Ce0.5Zr0.5O2 support enhanced the reducibility of surface ceria. This phenomenon was more pronounced for platinum catalysts. Introduction of both noble metals led to the decrease of catalysts’ acidity. In total oxidation of dichloromethane, the noble metal catalysts showed lower catalytic performance compared to parent Ce0.5Zr0.5O2, due to lower amount of acid sites that act as chemisorption sites for chlorinated compounds. On the other hand, platinum catalysts exhibited significantly enhanced selectivity to CO2 in comparison with the Ce0.5Zr0.5O2 support. In total oxidation of ethanol, the deposition of platinum on Ce0.5Zr0.5O2 resulted in a significant increase in catalytic performance, while the introduction of gold had only a minor effect. Moreover, the positive effect of higher noble metal loading on catalytic performance was more pronounced for Pt catalysts. For all investigated catalysts, the temperature of the H2-TPR peak corresponding to the reduction of surface ceria correlated with their catalytic performance. The influence of Pt loading on the mechanism of ethanol oxidation was revealed. Based on the concentration profiles of individual by-products/products detected by on-line FTIR analysis, the possible pathways of their formation were suggested. Both noble metal catalysts exhibited higher selectivity to CO2 than the pristine Ce0.5Zr0.5O2.
Bibliografie:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2013.04.069