期刊
MATERIALS
卷 14, 期 17, 页码 -出版社
MDPI
DOI: 10.3390/ma14174814
关键词
zinc aluminate; palladium; cobalt oxide; copper oxide; propene catalytic oxidation
类别
资金
- Consejo Nacional de Investigaciones Cientificas y Tecnicas
- Agencia Nacional de Promocion Cientifica y Tecnologica [PICT 0737]
- Universidad Nacional de La Plata [X903]
Palladium-modified Co-ZnAl and Cu-ZnAl materials were found to be active for the catalytic oxidation of propene and propane, with oxide species playing a key role in catalytic activity. The addition of palladium enhanced the reducibility of the system and showed a synergic effect for propene oxidation, but this effect was not observed in propane oxidation.
Palladium-modified Co-ZnAland Cu-ZnAl materials were used and found active for the catalytic oxidation of propene and propane. According to the results obtained by XRD, TPR and XPS, the zinc aluminate-supported phases are oxide phases, Co3O4, CuO and PdOx for Co-ZnAl, Cu-ZnAl and Pd-ZnAl catalysts, respectively. These reducible oxide species present good catalytic activity for the oxidation reactions. The addition of palladium to Co-ZnAl or Cu-ZnAl samples promoted the reducibility of the system and, consequently, produced a synergic effect which enhanced the activity for the propene oxidation. The PdCo-ZnAl sample was the most active and exhibited highly dispersed PdOx particles and surface structural defects. In addition, it exhibited good catalytic stability. The H-2 pre-treated PdCu-ZnAl, PdCo-ZnAl and Pd-ZnAl samples showed higher activity than the original oxide catalysts, evidencing the important role of the oxidation state of the species, mainly of the palladium species, on the catalytic activity for the propene combustion. The synergic effect between metal transition oxides and PdOx could not be observed for the propane oxidation.
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