• 关键词：浸渍法  V₂O₅/CeO₂催化剂  钒酸铈

• 基金项目：国家自然科学基金项目(No.50878080);湖南省科技计划项目(No.[2008]GK3118);长沙市科技计划项目(No.k0803114-11)

• 李群
• 湖南大学环境科学与工程学院, 长沙 410082

• 李彩亭
• 湖南大学环境科学与工程学院, 长沙 410082

• 罗瑶
• 湖南大学环境科学与工程学院, 长沙 410082

• 田立辉
• 湖南大学环境科学与工程学院, 长沙 410082

• 柯琪
• 湖南大学环境科学与工程学院, 长沙 410082

• 路陪
• 湖南大学环境科学与工程学院, 长沙 410082

• 摘要：采用浸渍法制备了系列V₂O₅/CeO₂催化剂,用于低温NH₃选择性催化还原(NH₃-SCR)NO.同时,考察了催化剂中V₂O₅负载量和煅烧温度对催化活性的影响,并运用SEM、BET和XRD物理化学技术对催化剂进行了表征.结果表明,V₂O₅/CeO₂催化剂对模拟烟气中的NO转化呈现出较高的活性,但是V₂O₅负载量和催化剂的催化活性并不呈线性递增的关系.当V₂O₅负载量超过10%时,催化剂的催化活性开始下降.随着煅烧温度的升高,由于钒酸铈的生成,催化剂的催化活性下降.400℃为最佳煅烧温度.

• Abstract：A series of CeO₂ supported V₂O₅ catalysts were prepared by incipient impregnation for low temperature selective catalytic reduction(SCR) of NO_x with ammonia(NH₃).The effects of V₂O₅ loading of catalysts and calcination temperature on the catalytic activity were investigated.A combination of various physicochemical techniques such as SEM,BET surface area and X-ray diffraction(XRD) were used to characterize the catalysts.The experimental results showed that the V₂O₅/CeO₂ catalysts had high activity,but V₂O₅ loading and catalytic activity had no linear relationship.NO conversion increased significantly when the V₂O₅ loading was from 0 to 10%,but decreased at higher loading.As calcination temperature increased,catalytic activity decreased by the formation of CeVO₄.The best calcination temperature was 400℃.

• Key words：incipient impregnation  V₂O₅/CeO₂ catalysts  cerium vanadate

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