3种制备方法对Mn-Ce/TiO_(2)催化剂的性能影响及成本分析

Performance comparison and cost analysis of Mn-Ce/TiO_(2)catalyst made by different preparation methods

制备方法对催化剂的性能和成本有重要影响。选择共沉淀法、浸渍法和溶胶凝胶法制备Mn-Ce/TiO_(2)催化剂,在90~220℃对比测试不同方法制得催化剂样品的低温SCR性能,利用BET、SEM、XRD、FT-IR、H_(2)-TPR和NH_(3)-TPD分析样品的物理化学性质,并对3种方法的实验室制备过程进行成本分析。结果表明:共沉淀法和浸渍法制备的催化剂低温SCR性能均较好,在反应温度为150℃的条件下,催化剂的脱硝效率达到100%;制备方法不仅会影响催化剂的比表面积、表面形貌,还会对催化剂的氧化还原能力和表面酸性位产生影响;成本由低到高依次为浸渍法、溶胶凝胶法、共沉淀法。3种方法制得同样质量的催化剂时,采用浸渍法所消耗的药剂最少,而且浸渍法制备过程最短,操作最简单。本研究可为锰基低温脱硝催化剂的制备提供参考。

The preparation method has important influence on the performance and cost of the catalyst.MnCe/TiO_(2) catalysts were prepared by co-precipitation method,impregnation method and sol-gel method,and the low-temperature SCR performances of the catalysts were tested at 90~220℃.The physical and chemical properties of the catalyst samples were analyzed by BET,SEM,XRD,FT-IR,H_(2)-TPR and NH_(3)-TPD.And the cost analysis of the catalysts prepared by the three methods was carried out.The results showed that the performances of the catalysts prepared by the co-precipitation method and the impregnation method both were better,and the dnirification efficiencies of the catalysts reached 100%at the reaction temperature of 150℃.The preparation method would not only affect the specific surface area and surface morphology of the catalyst,but also affect the redox capacity and surface acidity of the catalyst.The cost of the three methods from low to high was impregnation method,sol-gel method,coprecipitation method.When the three methods were used to prepare catalysts of the same quality,the impregnation method consumed the least amount of reagents,the impregnation method took the shortest time and the operation of which was the simplest.