Selective catalytic oxidation of NH3 over noble metal-based catalysts: state of the art and future prospects,Catalysis Science & Technology

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Selective catalytic oxidation of NH3 over noble metal-based catalysts: state of the art and future prospects
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-07-27 , DOI: 10.1039/d0cy01137a
Tianwei Lan _{1,

2,

3,

4,

5} , Yufei Zhao _{1,

2,

3,

4,

5} , Jiang Deng _{1,

2,

3,

4,

5} , Jianping Zhang _{1,

2,

3,

4,

5} , Liyi Shi _{1,

2,

3,

4,

5} , Dengsong Zhang _{1,

2,

3,

4,

5}

Affiliation

Selective catalytic oxidation of ammonia to nitrogen and water vapor (NH₃-SCO) is considered to be an efficient technique to eliminate hazardous and pungent gaseous NH₃ is mainly emitted from selective catalytic reduction of NO_x with NH₃ units using appropriate catalysts. Due to the satisfactory low-temperature ammonia oxidation activity, noble metal-based catalysts are the primary groups applied in the NH₃-SCO reaction on account of their unique intrinsic properties. Meanwhile, it is essential that selectivity towards byproducts, including NO, NO₂ and N₂O, is as low as possible so that the high N₂ selectivity meets the stringent environmental policies in practical scenarios. To provide an overview of the NH₃-SCO reaction, this review starts with a general understanding of reaction mechanisms and catalyst promotion strategies. After that, the noble metal-based catalysts, namely Pt, Ag, Ru, Ir, Pd, Au and Rh-based catalysts, are discussed from the aspects of the regulation of active species, the adsorption and activation of reactants and intermediates, the formation of N-containing products and the coupling effects with NH₃-SCR catalysts. Finally, a condensed summary of previous work as well as reasonable suggestions and perspectives on future trends in this field are presented. To the best of our knowledge, this is the first comprehensive review on the application of noble metal-based catalysts in the NH₃-SCO reaction and we hope that this article will shed light on the rational catalyst design and in understanding the structure–property relationships of noble metal-based NH₃-SCO catalysts.

中文翻译：

贵金属基催化剂上的NH3选择性催化氧化：技术现状和未来前景

氨为氮和水蒸汽（NH的选择性催化氧化₃ - SCO）被认为是消除危险和辛辣气态NH的有效技术₃主要发射从NO的选择性催化还原_X与NH _3个使用适当的催化剂单元。由于令人满意的低温氨氧化活性，基于贵金属的催化剂由于其独特的固有性质而成为应用于NH ₃ -SCO反应的主要基团。同时，至关重要的是对副产物（包括NO，NO ₂和N ₂ O）的选择性要尽可能低，以使高N ₂在实际情况下，选择性符合严格的环境政策。为了提供NH ₃ -SCO反应的概述，本综述从对反应机理和催化剂促进策略的一般理解开始。然后，从活性物种的调节，反应物和中间体的吸附和活化，催化剂的活性，化学反应，化学反应，化学反应等方面讨论了贵金属基催化剂，即Pt，Ag，Ru，Ir，Pd，Au和Rh基催化剂。含氮产物的形成及其与NH ₃的偶联作用-SCR催化剂。最后，简要总结了以前的工作，以及对该领域未来趋势的合理建议和观点。据我们所知，这是对贵金属基催化剂在NH ₃ -SCO反应中的应用的首次全面综述，我们希望本文能够阐明合理的催化剂设计和对结构-性能的理解。贵金属NH ₃ -SCO催化剂的关系

更新日期：2020-09-05

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