Modifications of CeO2–ZrO2 solid solutions by nickel and sulfate as catalysts for NO reduction with ammonia in excess O2
Modifications of CeO2–ZrO2 solid solutions by nickel and sulfate as catalysts for NO reduction with ammonia in excess O2
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DOI：
10.1016/j.catcom.2010.05.011
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发表时间：
2010-07
影响因子：
3.7
通讯作者：
Zhichun Si;D. Weng;Xiaodong Wu;Jiang Yang;Bin Wang
中科院分区：
文献类型：
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作者：
Zhichun Si;D. Weng;Xiaodong Wu;Jiang Yang;Bin Wang
为了提高CeO 2-ZrO 2催化剂对氨还原NO的活性和选择性，在CeO 2-ZrO 2上浸渍了镍和硫酸盐。催化剂的性能与表面酸中心的类型有关。刘易斯酸中心被认为是低温NH3-SCR反应的重要活性中心，其强度通过镍的改性而提高。硫酸盐改性引入的B酸中心减弱了催化剂对氨的强氧化作用，但提高了催化剂对氨的吸附能力。因此，催化剂的高温活性也得到改善。
Nickel and sulfate were impregnated on CeO2–ZrO2to improve the activity and selectivity of catalyst for NO abatement with ammonia. The performance of catalyst is related to the types of surface acid sites. Lewis acid sites, of which the strength is increased by modification of nickel, are considered as the essential active sites for low-temperature NH3–SCR reaction. The introduction of Brønsted acid sites by sulfate modification weakens the strong oxidation of ammonia but enhances the ammonia adsorption capacity of catalyst. Therefore, the high-temperature activity of catalysts is also improved.