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OALib Journal期刊
ISSN: 2333-9721
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宽工作温度烟气脱硝催化剂制备及反应机理研究
, PP. 101-109
Keywords: 选择性催化还原,脱硝,原位红外光谱,nh3吸附,反应机理
Abstract:
？以溶胶-凝胶法制备介孔tio2载体，采用分步浸渍法制备了v2o5-wo3/tio2催化剂，借助bet、nh3-tpd、h2-tpr、sem、活性评价、in-situft-ir等手段，考察了催化剂的结构、酸性、还原性、脱硝活性及反应机理等。介孔tio2载体比表面积为158.6m2/g，制成催化剂后比表面积略有降低，约为136.7m2/g。针对模拟烟气在φnh3/φno=0.8的条件下测试催化剂的脱硝活性温度窗口为250~400℃，脱硝转化率达到80%。nh3-tpd和h2-tpr表征结果表明，催化剂在活性温度范围内具有典型的表面酸性位，载体tio2与v2o5之间存在的相互作用使得v2o5还原温度降低。利用in-situft-ir研究nh3和no在v2o5-wo3/tio2催化剂表面吸附和氧化的反应过程发现，nh3可同时吸附在l酸位和b酸位，nh3在活性位上氧化脱氢形成nh2物种是scr脱硝反应的控制步骤。研究no+o2+nh3反应时发现，吸附nh3的催化剂引入no和o2后，共价吸附的nh3首先消失。选择性催化还原反应发生在吸附态nh3和气态或弱吸附态的no之间，该反应遵从eley-rideal反应机理。
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