Kinetics of the Preferential Oxidation of CO over CuO/CeO2 Catalysts in H2-Rich Gases
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- 作者：Tiziana Caputo ; Luciana Lisi ; Raffaele Pirone ; Gennaro Russo
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2007
- 出版时间：October 10, 2007
- 年：2007
- 卷：46
- 期：21
- 页码：6793 - 6800
- 全文大小：204K
- 年卷期：v.46,no.21(October 10, 2007)
- ISSN：1520-5045
文摘
The influence of reaction parameters such as temperature, contact time, and O2, CO, H2, CO2, and H2Opartial pressures on the catalytic performances of 4 wt % CuO/CeO2 in the CO-PROX process (the preferentialoxidation of CO) has been investigated in a fixed-bed reactor. Catalyst appears very active (light-off at 70 C)and selective; reaction kinetics is weakly depressed by CO2 and H2O and not significantly increased withincreasing O2 concentration, while the reaction order in CO is variable with temperature ranging from values<1 up to 110 C and >1 at higher temperatures. A power-law rate equation fitted the experimental dataunder typical CO-PROX conditions in order to evidence the lower activation energy of the catalytic oxidationof CO with respect to H2. A Langmuir-Hinshelwood type reaction rate is able to describe the catalyticbehavior in the whole field of experimental conditions explored.