An environmentally-benign CeO2-TiO2 catalyst for the selective catalytic reduction of NOx with NH3 in simulated diesel exhaust

An environmentally-benign CeO2-TiO2 catalyst for the selective catalytic reduction of NOx with NH3 in simulated diesel exhaust
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一种环境友好型 CeO2-TiO2 催化剂,用于选择性催化还原模拟柴油机尾气中的 NH3 氮氧化物

DOI:
10.1016/j.cattod.2011.11.013
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发表时间:
2012-04
期刊:
影响因子:
5.3
通讯作者:
Changbin Zhang
Changbin Zhang
中科院分区:
化学2区
文献类型:
--
作者:
Wenpo Shan;Fudong Liu;Hong He;Xiaoyan Shi;Changbin Zhang

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用优化的均匀沉淀法制备的Ce-Ti基(CeO_2-TiO_2)催化剂具有良好的NH_3-SCR活性、高的N_2选择性、宽的操作温度窗口和高的空速阻力(即使在500000h−1的高空速下也是如此)。与V2O5-WO3/TiO2和Fe-ZSM-5催化剂相比,CeO2-TiO2催化剂对NH3-SCR表现出更好的催化性能。在较真实的模拟柴油机尾气排放条件下,在H2O、CO2和C3H6存在下,当空速为20000h−1时,CeO2-TiO2整体式催化剂在250~450℃范围内的NOx转化率可达90%以上。均相沉淀过程中活性CeO2在TiO2上的高分散性以及CeO2-TiO2中CeO2与TiO2的协同作用是NH3-SCR活性高的重要原因。
A Ce-Ti based (CeO2-TiO2) catalyst prepared by an optimized homogeneous precipitation method showed excellent NH3-SCR activity, high N2selectivity, broad operation temperature window, and high resistance to space velocity (even under a high gas hourly space velocity (GHSV) of 500,000h−1). Compared with V2O5-WO3/TiO2and Fe-ZSM-5 catalysts, the CeO2-TiO2catalyst showed better catalytic performance for NH3-SCR. Under a more realistic condition of simulated diesel engine exhaust, the monolith catalyst of CeO2-TiO2showed over 90% NOxconversion from 250 to 450°C under a GHSV of 20,000h−1in the presence of H2O, CO2, and C3H6. The high dispersion of active CeO2on TiO2in the process of homogenous precipitation and the synergistic effects between CeO2and TiO2in CeO2-TiO2are important reasons for the high NH3-SCR activity.
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