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OALib Journal期刊
ISSN: 2333-9721
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电厂烟气脱硝催化剂v2o5-wo3/tio2失活机理研究
, PP. 1359-1365
Keywords: 燃煤电厂,选择性催化还原,催化剂,失活机理,硫酸铝
Abstract:
？分别以某电厂失活和新鲜的烟气选择性催化还原(scr)脱硝催化剂为研究对象,模拟测试催化剂的脱硝效率,并采用扫描电子显微镜-能量色散x射线光谱(sem-edx)、x荧光光谱(xrf)、x光电子能谱(xps)、氮气吸脱附、傅里叶红外光谱(ft-ir)、x射线衍射(xrd)和热重分析(tg)等手段对催化剂的微观结构和表面形态进行表征,探讨了scr催化剂的失活机制。结果表明,380℃下失活催化剂的脱硝效率(35.0%)和比表面积(1.05m2/g)明显低于新鲜催化剂(88.2%,72.50m2/g)。与新鲜催化剂相比,失活催化剂中v5+的比例由17.4%升高到32.2%,并且表面出现了大量的al2(so4)3。另外,sem和xrd结果表明,失活催化剂出现了烧结。催化剂表面v价态的改变、高温烧结和表面al2(so4)3相的大量生成是催化剂失活的主要原因。
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