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Birnessite as a Highly Efficient Catalyst for Low-Temperature NH3-SCR: The Vital Role of Surface Oxygen Vacancies
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-07-23 , DOI: 10.1021/acs.iecr.0c00188 Xue Fang 1 , Yongjun Liu 1, 2 , Wanglai Cen 2 , Yan Cheng 3
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-07-23 , DOI: 10.1021/acs.iecr.0c00188 Xue Fang 1 , Yongjun Liu 1, 2 , Wanglai Cen 2 , Yan Cheng 3
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Birnessite was synthesized by a simple hydrothermal method and used for low-temperature selective catalytic reduction of NO with NH3 (NH3-SCR). Physicochemical characterizations showed that the exposure of surface oxygen vacancies on birnessite was affected by heat treatment through the removal of water molecules. The sample heat-treated at a temperature of 150 °C, having the most exposed surface oxygen vacancies, exhibited excellent catalytic activity with 100% NO removal rate at 99 °C. In addition, density functional theory (DFT) calculations were combined with TPD techniques and in situ Fourier transform infrared (FTIR) to disclose the mechanism of NH3-SCR over birnessite. The results indicated that surface oxygen vacancies played a vital role in adsorption and oxidiation of reactant molecules and participated in the formation of acidic sites. This study shows that regulation of the exposure of surface oxygen vacancies of birnessite significantly improves its low-temperature NH3-SCR catalytic activity.
中文翻译：
水钠锰矿作为低温NH 3 -SCR的高效催化剂：表面氧空位的重要作用
通过简单的水热法合成水钠锰矿，并将其用于NH 3（NH 3 -SCR）的低温选择性催化还原NO 。理化特性表明，水钠锰矿上表面氧空位的暴露受到热处理的影响，方法是去除水分子。在150°C的温度下进行热处理的样品具有最大的暴露表面氧空位，在99°C时具有100％NO去除率的优异催化活性。此外，将密度泛函理论（DFT）计算与TPD技术和原位傅立叶变换红外（FTIR）相结合，以揭示NH 3的机理。-SCR在水钠锰矿上。结果表明，表面氧空位在反应物分子的吸附和氧化中起着至关重要的作用，并参与了酸性位点的形成。这项研究表明，调节水钠锰矿表面氧空位的暴露显着改善了其低温NH 3 -SCR催化活性。
更新日期：2020-08-19
中文翻译：
水钠锰矿作为低温NH 3 -SCR的高效催化剂：表面氧空位的重要作用
通过简单的水热法合成水钠锰矿，并将其用于NH 3（NH 3 -SCR）的低温选择性催化还原NO 。理化特性表明，水钠锰矿上表面氧空位的暴露受到热处理的影响，方法是去除水分子。在150°C的温度下进行热处理的样品具有最大的暴露表面氧空位，在99°C时具有100％NO去除率的优异催化活性。此外，将密度泛函理论（DFT）计算与TPD技术和原位傅立叶变换红外（FTIR）相结合，以揭示NH 3的机理。-SCR在水钠锰矿上。结果表明，表面氧空位在反应物分子的吸附和氧化中起着至关重要的作用，并参与了酸性位点的形成。这项研究表明，调节水钠锰矿表面氧空位的暴露显着改善了其低温NH 3 -SCR催化活性。
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