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Adsorption-Induced Active Vanadium Species Facilitate Excellent Performance in Low-Temperature Catalytic NOx Abatement
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2021-06-30 , DOI: 10.1021/jacs.1c05354 Zhihua Lian 1 , Jie Wei 2 , Wenpo Shan 1 , Yunbo Yu 1, 3, 4 , Petar M Radjenovic 2 , Hua Zhang 2 , Guangzhi He 3 , Fudong Liu 5 , Jian-Feng Li 2 , Zhong-Qun Tian 2 , Hong He 1, 3, 4
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2021-06-30 , DOI: 10.1021/jacs.1c05354 Zhihua Lian 1 , Jie Wei 2 , Wenpo Shan 1 , Yunbo Yu 1, 3, 4 , Petar M Radjenovic 2 , Hua Zhang 2 , Guangzhi He 3 , Fudong Liu 5 , Jian-Feng Li 2 , Zhong-Qun Tian 2 , Hong He 1, 3, 4
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Vanadia-based catalysts have been widely used for catalyzing various reactions, including their long-standing application in the deNOx process. It has been commonly considered that various vanadium species dispersed on supports with a large surface area act as the catalytically active sites. However, the role of crystalline V2O5 in selective catalytic reduction of NOx with NH3 (NH3-SCR) remains unclear. In this study, a catalyst with low vanadia loading was synthesized, in which crystalline V2O5 was deposited on a TiO2 support that had been pretreated at a high temperature. Surprisingly, the catalyst, which had a large amount of crystalline V2O5, showed excellent low-temperature NH3-SCR activity. For the first time, crystalline V2O5 on low-vanadium-loading catalysts was found to be transformed to polymeric vanadyl species by the adsorption of NH3. The generated active polymeric vanadyl species played a crucial role in NH3-SCR, leading to remarkably enhanced catalytic performance at low temperatures. This new finding provides a fundamental understanding of the metal oxide-catalyzed chemical reaction and has important implications for the development and commercial applications of NH3-SCR catalysts.
中文翻译：
吸附诱导的活性钒物质在低温催化 NO x减排中具有出色的性能
钒基催化剂已广泛用于催化各种反应，包括其在DENO长期应用X的过程。通常认为分散在具有大表面积的载体上的各种钒物质充当催化活性位点。然而，结晶V 2 O 5在用NH 3 (NH 3 -SCR)选择性催化还原NO x 中的作用仍不清楚。在这项研究中，合成了一种低钒负载的催化剂，其中结晶 V 2 O 5沉积在 TiO 2已在高温下预处理的载体。令人惊讶的是，具有大量结晶V 2 O 5的催化剂表现出优异的低温NH 3 -SCR活性。首次发现低钒负载催化剂上的结晶 V 2 O 5通过吸附 NH 3转化为聚合氧钒物质。生成的活性聚合氧钒物种在 NH 3 中起着至关重要的作用-SCR，在低温下显着提高催化性能。这一新发现提供了对金属氧化物催化化学反应的基本理解，并对NH 3 -SCR 催化剂的开发和商业应用具有重要意义。
更新日期：2021-07-14
中文翻译：
吸附诱导的活性钒物质在低温催化 NO x减排中具有出色的性能
钒基催化剂已广泛用于催化各种反应，包括其在DENO长期应用X的过程。通常认为分散在具有大表面积的载体上的各种钒物质充当催化活性位点。然而，结晶V 2 O 5在用NH 3 (NH 3 -SCR)选择性催化还原NO x 中的作用仍不清楚。在这项研究中，合成了一种低钒负载的催化剂，其中结晶 V 2 O 5沉积在 TiO 2已在高温下预处理的载体。令人惊讶的是，具有大量结晶V 2 O 5的催化剂表现出优异的低温NH 3 -SCR活性。首次发现低钒负载催化剂上的结晶 V 2 O 5通过吸附 NH 3转化为聚合氧钒物质。生成的活性聚合氧钒物种在 NH 3 中起着至关重要的作用-SCR，在低温下显着提高催化性能。这一新发现提供了对金属氧化物催化化学反应的基本理解，并对NH 3 -SCR 催化剂的开发和商业应用具有重要意义。
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