Selective Catalytic Reduction of NOx with NH3 by Using Novel Catalysts: State of the Art and Future Prospects.,Chemical Reviews

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Selective Catalytic Reduction of NOx with NH3 by Using Novel Catalysts: State of the Art and Future Prospects.
Chemical Reviews ( IF 51.4 ) Pub Date : 2019-08-15 , DOI: 10.1021/acs.chemrev.9b00202
Lupeng Han ₁ , Sixiang Cai _{1,

2} , Min Gao ₃ , Jun-Ya Hasegawa ₃ , Penglu Wang ₁ , Jianping Zhang ₁ , Liyi Shi ₁ , Dengsong Zhang ₁

Affiliation

Selective catalytic reduction with NH3 (NH3-SCR) is the most efficient technology to reduce the emission of nitrogen oxides (NOx) from coal-fired industries, diesel engines, etc. Although V2O5-WO3(MoO3)/TiO2 and CHA structured zeolite catalysts have been utilized in commercial applications, the increasing requirements for broad working temperature window, strong SO2/alkali/heavy metal-resistance, and high hydrothermal stability have stimulated the development of new-type NH3-SCR catalysts. This review summarizes the latest SCR reaction mechanisms and emerging poison-resistant mechanisms in the beginning and subsequently gives a comprehensive overview of newly developed SCR catalysts, including metal oxide catalysts ranging from VOx, MnOx, CeO2, and Fe2O3 to CuO based catalysts; acidic compound catalysts containing vanadate, phosphate and sulfate catalysts; ion exchanged zeolite catalysts such as Fe, Cu, Mn, etc. exchanged zeolite catalysts; monolith catalysts including extruded, washcoated, and metal-mesh/foam-based monolith catalysts. The challenges and opportunities for each type of catalysts are proposed while the effective strategies are summarized for enhancing the acidity/redox circle and poison-resistance through modification, creating novel nanostructures, exposing specific crystalline planes, constructing protective/sacrificial sites, etc. Some suggestions are given about future research directions that efforts should be made in. Hopefully, this review can bridge the gap between newly developed catalysts and practical requirements to realize their commercial applications in the near future.

中文翻译：

通过使用新型催化剂选择性地用NH3还原NOx的技术现状和未来前景。

使用NH3选择性催化还原（NH3-SCR）是减少燃煤工业，柴油发动机等中氮氧化物（NOx）排放的最有效技术。尽管V2O5-WO3（MoO3）/ TiO2和CHA结构的沸石催化剂已经将其用于商业应用中，对宽工作温度范围，对SO2 /碱/重金属的耐受性强以及对水热稳定性高的要求不断提高，刺激了新型NH3-SCR催化剂的开发。这篇综述从一开始就总结了最新的SCR反应机理和新兴的抗毒机理，随后对新开发的SCR催化剂进行了全面概述，包括从VOx，MnOx，CeO2和Fe2O3到基于CuO的金属氧化物催化剂; 含钒酸盐的酸性复合催化剂，磷酸盐和硫酸盐催化剂；离子交换沸石催化剂，例如Fe，Cu，Mn等交换沸石催化剂；整体催化剂，包括挤出，修补基面涂层和基于金属网/泡沫的整体催化剂。提出了每种催化剂的挑战和机遇，同时总结了通过改性提高酸度/氧化还原环和抗毒性，创建新颖的纳米结构，暴露特定的晶面，构造保护/牺牲位点等有效策略。给出了应作出努力的未来研究方向。希望，这篇综述可以弥合新开发的催化剂与实际需求之间的差距，以在不久的将来实现其商业应用。交换沸石催化剂；整体催化剂，包括挤出，修补基面涂层和基于金属网/泡沫的整体催化剂。提出了每种催化剂的挑战和机遇，同时总结了通过改性提高酸度/氧化还原环和抗毒性，创建新颖的纳米结构，暴露特定的晶面，构造保护/牺牲位点等有效策略。给出了应作出努力的未来研究方向。希望，这篇综述可以弥合新开发的催化剂与实际需求之间的差距，以在不久的将来实现其商业应用。交换沸石催化剂；整体催化剂，包括挤出，修补基面涂层和基于金属网/泡沫的整体催化剂。提出了每种催化剂的挑战和机遇，同时总结了通过改性提高酸度/氧化还原环和抗毒性，创建新颖的纳米结构，暴露特定的晶面，构造保护/牺牲位点等有效策略。给出了应作出努力的未来研究方向。希望，这篇综述可以弥合新开发的催化剂与实际需求之间的差距，以在不久的将来实现其商业应用。

更新日期：2019-08-16

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