期刊
JOURNAL OF POROUS MATERIALS
卷 21, 期 5, 页码 551-563出版社
SPRINGER
DOI: 10.1007/s10934-014-9802-y
关键词
Support effect; Acidity; Reaction condition; Catalytic oxidation; Pd; Toluene
资金
- National Natural Science Foundation [21107106]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB05050500]
The effects of catalyst physicochemical property and operation condition on toluene destruction over Pd/Z-x (Z: ZSM-5; x: n (Si/Al)) were extensively studied. The support acidity has important impact on active phase dispersion and reaction product desorption. Pd/Z-25 shows the highest catalytic activity with toluene complete conversion at 220 A degrees C, which is about 60 A degrees C lower than that of Pd/Z-300. Both Pd loading and space velocity are key experimental factors determining toluene oxidation activity. The water vapor has a significant negative effect on the oxidation reaction, especially for the catalyst with higher Al content. The activity of the used Pd/Z-25 could not regain its initial level after removal of water vapor due to the formation of coke. Pd-0 and Pd2+ species have a synergetic effect on toluene oxidation, and the catalytic activity is primarily correlated to the support acidity, the active phase dispersion, and the CO2 desorption capability.
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