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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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γ-al2o3对scr脱硝催化剂v2o5-wo3/tio2的改性研究
, PP. 1258-1263
Keywords: al2o3,tio2,选择性催化还原反应,催化剂,改性
Abstract:
？采用溶胶凝胶法制备了不同γ-al2o3含量的钛铝复合载体,以此为载体采用浸渍法负载v2o5和wo3制备了一系列催化剂。采用x射线衍射(xrd)、比表面积测定(bet)、程序升温还原(h2-tpr)、高分辨率透射电子显微镜(hrtem)等表征技术对催化剂表面形态进行分析,同时在模拟氨气选择性催化还原no(nh3-scr)的反应条件下,对催化剂的脱硝反应活性和so2抗中毒进行考察。结果发现,tio2和γ-al2o3之间的协同作用使得v2o5-wo3/tio2-γ-al2o3催化剂的脱硝效率及活性窗口明显优于单一载体制备的催化剂,表现出了良好的热稳定性和抗so2毒化能力,特别是v2o5-wo3/tio2-15%γ-al2o3在310~460℃,no的转化率均在80%以上,反应窗口最宽。各种表征结果表明,tio2-γ-al2o3复合载体中γ-al2o3高度分散在tio2上,复合载体具有较大的比表面积,同时具有较强的还原能力。
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