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首页> 外文期刊>Catalysis science & technology >Sulfate promotion of selective catalytic reduction of nitric oxide by ammonia on ceria
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Sulfate promotion of selective catalytic reduction of nitric oxide by ammonia on ceria

机译：硫酸促进选择性催化还原一氧化氮的二氧化铈的氨

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Selective catalytic reduction of nitric oxide by ammonia (NH3-SCR) is a promising technology for NOx emission control. In this work, the recently discovered sulfate promotion effect in this reaction was thoroughly investigated on ceria. Sulfates derived from different organic S precursors all exhibit a promotion effect. Mechanistic studies generate a reaction network including both Langmuir-Hinshelwood and Eley-Rideal mechanisms. Sulfates were shown to be versatile promoters with multiple functions: they tune the adsorption of reactants towards a more balanced intermediate coverage by creating strong Lewis acid sites, facilitate *NH2 formation, and suppress ammonia oxidation through surface oxygen deactivation. The comparison between sulfates and the classic inorganic promoter FeOx revealed that sulfates are more effective, especially at high temperature. This is mainly attributed to the high coverages of Eley-Rideal intermediates and low ammonia oxidation activity on sulfated ceria. This work provides fundamental understanding of the role of surface sulfates in NH3-SCR, which are essential under actual operation conditions. This understanding presents an exciting opportunity for future catalyst design with high durability and low cost.
机译：选择性催化还原一氧化氮氨(NH3-SCR)是一种有前途的技术氮氧化物排放控制。发现硫酸促进效应二氧化铈反应是彻底调查。硫酸盐源自不同的有机前体所有展览促销的效果。机械的研究产生的反应网络包括Langmuir-Hinshelwood和Eley-Rideal机制。多才多艺的推动者与多个功能:他们对一个更优化反应物的吸附通过创建强大的平衡中间覆盖路易斯酸网站,方便*氨基形成,通过表面氧抑制氨的氧化失活。典型的无机发起人FeOx透露硫酸盐更有效,特别是在高温度。很高的Eley-Rideal中间体和保险低硫酸氨的氧化活动二氧化铈。这项工作提供了基本的认识NH3-SCR表面硫酸盐的作用,在实际操作条件下是必不可少的。这种理解是一个令人兴奋的未来催化剂设计与高的机会耐用性和低成本。

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