Effect of SO2 on Catalytic Performance of CoH-FBZ for Selective Catalytic Reduction of NO by CH4 in The Presence of O2
| Autor: | Yuying Liu, Yong He, Jinqiao Zhang, Rui-feng Li, Wei-bin Fan |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Environmental Engineering Science. 24:292-300 |
| ISSN: | 1557-9018 1092-8758 |
| DOI: | 10.1089/ees.2005.0088 |
| Popis: | The effect of SO2 on the catalytic performance of CoH–FBZ (FBZ is composite zeolite with FAU and BEA topology) and CoH–Beta for selective catalytic reduction of NO by CH4 (CH4 –SCR) were studied with SO2 temperature-programmed surface reaction (TPSR) and NO + (O2) adsorption and temperature-programmed desorption (TPD) techniques. The CH4 –SCR activity results showed that the change in topology of the zeolite had a strong impact on effect of SO2. In the same reaction conditions, CH4 –SCR activity decreased less over CoH–FBZ than over CoH–Beta due to the addition of SO2 , regardless of the presence or absence of H2O. Addition of 78 ppm SO2 decreased the NO to N2 conversion from 85% to a stable level at 70% over CoH–FBZ, while from 71% to a stable level at 51% over CoH–Beta at 773 K. Comparing with fresh catalysts, after poisoning reaction in 673–823 K, a decrease of capacity for NO + O2 adsorption over SO2 -exposed CoH–FBZ was less than that over SO2 -exposed CoH–Beta. CoH–FBZ exhibited better SO2 tolerance... |
| Databáze: | OpenAIRE |
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