EPR表征SCR催化剂对NO(或NH3) +O2的吸附

2011 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring Pub Date : 2011-04-11 DOI:10.1109/CDCIEM.2011.492

Du Yun-gui, Liang Yun-tao, Zhong Qin

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引用次数: 0

摘要

采用EPR研究了反应物在商品化SCR催化剂表面的吸附，以及H2O和SO2对催化剂表面吸附的影响。结果表明，在NO + O2气氛下，催化剂上的V4+能被氧化，nh3吸附在Brönsted酸位上。吸附后H2O和so2的存在促进了V4+和超氧离子的数量。但当有H2O和SO2存在时，Fe3+的强度降低，表明Fe3+具有良好的抗中毒作用。

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Adsorption of NO (or NH3) +O2 over the Commercial SCR Catalyst Characterized by EPR

The adsorption of reactants over the commerciallized SCR catalyst suface was investigated by EPR, as well as the influence of H2O and SO2. The results showed that the V4+ over the catalyst could be oxidized under NO + O2 atmosphere, andNH3 was adsorbed on Brönsted acid sites. The amounts of V4+and super oxide ions were promoted at the presence of H2O andSO2 after adsorption. However, the intensity of Fe3+ decreased when H2O and SO2 were present, indicating the favorable effect of Fe3+ for anti-poisoning.

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2011 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring

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