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Tailored activity of Cu–Fe bimetallic Beta zeolite with promising C3H6 resistance for NH3-SCR
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-10-27 , DOI: 10.1039/d0cy01631d Qi Zhao 1, 2, 3, 4, 5 , Bingbing Chen 1, 2, 3, 4, 5 , Bolin Zou 1, 2, 3, 4, 5 , Limei Yu 1, 2, 3, 4, 5 , Chuan Shi 1, 2, 3, 4, 5
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-10-27 , DOI: 10.1039/d0cy01631d Qi Zhao 1, 2, 3, 4, 5 , Bingbing Chen 1, 2, 3, 4, 5 , Bolin Zou 1, 2, 3, 4, 5 , Limei Yu 1, 2, 3, 4, 5 , Chuan Shi 1, 2, 3, 4, 5
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The application of Beta zeolites in the selective catalytic reduction of NOx with NH3 in diesel engines is limited to some extent by catalyst deactivation due to hydrocarbons, especially in the case of Fe-Beta. One possible solution is to introduce an oxidative component that can facilitate the partial oxidation of hydrocarbons and prevent their deposition in the form of polyene, therefore improving the hydrocarbon resistance of Beta zeolites. Herein, copper ions with better redox ability cooperated with Fe ions in a Beta zeolite, and this is demonstrated to improve the NH3-SCR performance in the presence of C3H6. Cu6.8-Fe-Beta possesses NOx conversion higher than 80% over a wide temperature range (200–550 °C) and preferable N2 selectivity in the presence of C3H6. The introduction of Cu inhibited the polymerization of C3H6 and promoted the oxidation of C3H6, which alleviated competitive adsorption between C3H6 and NOx. Furthermore, Cu6.8-Fe-Beta can maintain great NOx conversion levels after hydrothermal aging at 750 °C, giving this bimetallic Cu-Fe-Beta zeolite conspicuous practical application prospects.
中文翻译：
具有预期的C3H6耐NH3-SCR性能的Cu-Fe双金属β沸石的定制活性
Beta沸石在柴油机中用NH 3选择性催化还原NO x的应用在某种程度上受到烃类引起的催化剂失活的限制，特别是在Fe-β的情况下。一种可能的解决方案是引入一种氧化组分，该组分可以促进烃的部分氧化并防止其以多烯形式沉积，因此提高了β沸石的耐烃性。在本文中，具有更好的氧化还原能力的铜离子与β沸石中的Fe离子配合，这被证明可以改善在C 3 H 6存在下的NH 3 -SCR性能。Cu 6.8 -Fe-Beta具有NO x在较宽的温度范围（200–550°C）中，转化率高于80％，在C 3 H 6存在下，N 2的选择性更好。引入铜的抑制C的聚合3 ħ 6，促进C的氧化3 ħ 6，这减轻℃之间竞争吸附3 ħ 6和NO X。此外，Cu 6.8 -Fe-β沸石在750°C的水热老化后仍可保持较高的NO x转化水平，从而使这种双金属Cu-Fe-β沸石具有明显的实际应用前景。
更新日期：2020-11-18
中文翻译：
具有预期的C3H6耐NH3-SCR性能的Cu-Fe双金属β沸石的定制活性
Beta沸石在柴油机中用NH 3选择性催化还原NO x的应用在某种程度上受到烃类引起的催化剂失活的限制，特别是在Fe-β的情况下。一种可能的解决方案是引入一种氧化组分，该组分可以促进烃的部分氧化并防止其以多烯形式沉积，因此提高了β沸石的耐烃性。在本文中，具有更好的氧化还原能力的铜离子与β沸石中的Fe离子配合，这被证明可以改善在C 3 H 6存在下的NH 3 -SCR性能。Cu 6.8 -Fe-Beta具有NO x在较宽的温度范围（200–550°C）中，转化率高于80％，在C 3 H 6存在下，N 2的选择性更好。引入铜的抑制C的聚合3 ħ 6，促进C的氧化3 ħ 6，这减轻℃之间竞争吸附3 ħ 6和NO X。此外，Cu 6.8 -Fe-β沸石在750°C的水热老化后仍可保持较高的NO x转化水平，从而使这种双金属Cu-Fe-β沸石具有明显的实际应用前景。
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