Solvation and Mobilization of Copper Active Sites in Zeolites by Ammonia: Consequences for the Catalytic Reduction of Nitrogen Oxides.,Accounts of Chemical Research

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Solvation and Mobilization of Copper Active Sites in Zeolites by Ammonia: Consequences for the Catalytic Reduction of Nitrogen Oxides.
Accounts of Chemical Research ( IF 16.4 ) Pub Date : 2020-08-11 , DOI: 10.1021/acs.accounts.0c00328
Christopher Paolucci ₁ , John R Di Iorio ₂ , William F Schneider ₃ , Rajamani Gounder ₂

Affiliation

Copper-exchanged chabazite (Cu-CHA) zeolites are catalysts used in diesel emissions control for the abatement of nitrogen oxides (NO_x) via selective catalytic reduction (SCR) reactions with ammonia as the reductant. The discovery of these materials in the early 2010s enabled a step-change improvement in diesel emissions aftertreatment technology. Key advantages of Cu-CHA zeolites over prior materials include their effectiveness at the lower temperatures characteristic of diesel exhaust, their durability under high-temperature hydrothermal conditions, and their resistance to poisoning from residual hydrocarbons present in exhaust. Fundamental catalysis research has since uncovered mechanistic and kinetic features that underpin the ability of Cu-CHA to selectively reduce NO_x under strongly oxidizing conditions and to achieve improved NO_x conversion relative to other zeolite frameworks, particularly at low exhaust temperatures and with ammonia instead of other reductants.

中文翻译：

氨对沸石中铜活性位点的溶解和活化：氮氧化物催化还原的后果。

铜交换菱沸石（Cu-CHA）沸石是用于柴油机排放控制的催化剂，该催化剂通过使用氨作为还原剂的选择性催化还原（SCR）反应来减少氮氧化物（NO _x）。在2010年代初发现这些材料后，柴油排放后处理技术得到了逐步改进。与现有材料相比，Cu-CHA沸石的关键优势包括：它们在柴油机排气的低温特性下具有有效性，在高温水热条件下的耐久性以及对排气中残留的碳氢化合物中毒的抵抗力。基本面催化研究终于揭开机理和动力学特性，巩固铜-CHA的选择地降低NO的能力_X强氧化性的条件下，实现改进的NO _X相对转化到其他沸石骨架，特别是在低排气温度和用氨来代替其他还原剂。

更新日期：2020-09-15

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