Fabrication of PdZn alloy catalysts supported on ZnFe composite oxide for CO2 hydrogenation to methanol
Fabrication of PdZn alloy catalysts supported on ZnFe composite oxide for CO2 hydrogenation to methanol
复制标题
ZnFe复合氧化物负载PdZn合金催化剂的制备用于CO2加氢制甲醇
DOI：
10.1016/j.jcis.2021.03.135
复制
发表时间：
2021
影响因子：
9.9
通讯作者：
Hong Xinlin
中科院分区：
文献类型：
--
作者：
Wang Yanqiu;Wu Dengdeng;Liu Tangkang;Liu Guoliang;Hong Xinlin
CO2转化为甲醇对于提供CO2固定手段和未来燃料的开发具有重要意义。负载型Pd催化剂在CO2加氢制甲醇反应中表现出良好的催化活性，PdZn合金在该反应中起着关键作用。因此，采用富ZnO载体来增加纳米PdZn合金颗粒的数量是开发理想催化剂的有效策略。本文以富ZnO的ZnFe 2 O 4尖晶石为载体，制备了一种高效CO2加氢制甲醇的PdZn合金催化剂。考察了ZnFe 2 O 4上ZnO浓度对PdZn合金生成量和催化剂结构的影响，得到了最佳的Pd-Z1 FO催化剂，在290 °C、4.5 MPa和21600 mL g−1h − 1的反应条件下，甲醇时空产率（STY）为593 g kgcat−1h−1（12 g gPd−1h − 1），CO2转化率为14%。此外，暴露的PdZn合金网站的数量进行了测量，通过使用CO脉冲化学吸附，我们发现甲醇生产率和PdZn合金网站之间的线性关系。
The conversion of CO2to methanol is of great significance for providing a means of CO2fixation and the development of future fuels. Supported Pd catalysts have been demonstrated to be active for CO2hydrogenation to methanol and PdZn alloy plays a key role in this reaction. Therefore, using ZnO-enriched support to increase the amount of nanometric PdZn alloy particles on the surface is an effective strategy to develop ideal catalysts. Herein, we fabricated a PdZn alloy catalyst supported on ZnO-enriched ZnFe2O4spinel for efficient CO2hydrogenation to methanol. The amount of formed PdZn alloy and catalyst structure influenced by ZnO concentration on ZnFe2O4were explored to obtain the best Pd-Z1FO catalyst, which achieves a methanol space-time yield (STY) of 593 g kgcat−1h−1(12 g gPd−1h−1) with CO2conversion of 14% under reaction conditions of 290 °C, 4.5 MPa and 21600 mL g−1h−1. Furthermore, the amount of exposed PdZn alloy sites were measured by using CO-pulse chemisorption and we find a linearity between methanol production rate and PdZn alloy sites.