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锆掺杂对Ti-Ce-Ox复合氧化物NH3选择性催化还原NO的影响

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Abstract:

采用共混法制备Ti-Ce-Zr-Ox复合氧化物脱硝催化剂,主要研究Ti-Ce-Zr-Ox复合氧化物催化剂NH3选择性催化还原[selectivecatalyticreduction(SCR),NH3-SCR]NO的活性,重点考察锆掺杂对Ti-Ce-Ox复合氧化物催化剂NH3-SCR脱除NO的影响。用X射线衍射、氮气物理吸附、扫描电镜、能谱分析及氨气程序控温脱附等手段分别表征分析催化剂的晶型、表面积及孔分布、结构形貌、元素组成及固体酸量。结果表明当摩尔比n(NH3)n(NO)=11、体积空间速率为5000/h时,TiCe0.1Zr0.1O2.4复合氧化物的NH3-SCR脱除NO活性最高,达到92.70%,催化活性温度窗口为200~350℃;相比Ti-Ce-Ox复合氧化物,锆掺杂拓宽了催化活性温度窗口,使之向低温区偏移50℃;反应温度为300℃时,NO转化率提高了16.67%。锆掺杂可以细化催化剂晶粒,促进生成氧空位,明显提高催化剂固体酸量,使催化脱硝活性提高。

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