The Remarkable Improvement of a CeTi based Catalyst for NOx Abatement, Prepared by a Homogeneous Precipitation Method
The Remarkable Improvement of a CeTi based Catalyst for NOx Abatement, Prepared by a Homogeneous Precipitation Method
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DOI：
10.1002/cctc.201000409
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发表时间：
2011-08
期刊：
影响因子：
4.5
通讯作者：
Wenpo Shan;Fudong Liu;Hong He;Xiaoyan Shi;Changbin Zhang
中科院分区：
文献类型：
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作者：
Wenpo Shan;Fudong Liu;Hong He;Xiaoyan Shi;Changbin Zhang
溶胶-凝胶法用于NH3-SCR。然而，目前报道的CeTi基催化剂在实际应用中仍存在一些问题，如操作温度窗口窄，低温活性差等。研究表明，催化剂的制备方法对CeTi基催化剂的催化性能有显著影响，活性组分CeO 2在TiO 2上的良好分散对提高NH3-SCR活性至关重要。（8-10）均相沉淀，其特征在于通过一些有机碱的热分解实现金属盐溶液的pH的高度均匀增加，是一种合适的催化剂制备方法，其可以制备高度分散的混合金属氧化物。本文报道了以尿素为沉淀剂的均相沉淀法制备的CeTi基催化剂的显著改进。图1中示出了相对于CeaTiOx（500）（a = 0.1、0.2、0.5、1.0）的NOx转化率和N2选择性。Ce0.1TiOx（500）显示
sol-gel method for NH3-SCR. Nevertheless, the reported CeTi based catalysts still have some problems in practical use, such as the narrow operation temperature window and poor activity in the low temperature range. Previous studies have shown that catalyst preparation meth- ods can significantly influence the catalytic performance of CeTi based catalysts, and a good dispersion of active compo- nent CeO2 on TiO2 is very important for the improvement of NH3-SCR activity. (8-10) Homogeneous precipitation, characterized by a highly uniform increase in the pH of metal salts solution achieved by thermal decomposition of some organic alkali, is a suitable catalyst preparation method that can produce highly dispersed mixed metal oxides. In this study, we report a signifi- cant improvement of CeTi based catalyst prepared by a ho- mogeneous precipitation method using urea as precipitator. NOx conversions and N2 selectivity over CeaTiOx(500) (a = 0.1, 0.2, 0.5, 1.0) are presented in Figure 1. Ce0.1TiOx(500) showed