Zn Loading Effects on the Selectivity of PdZn Catalysts for CO2 Hydrogenation to Methanol

Zn Loading Effects on the Selectivity of PdZn Catalysts for CO2 Hydrogenation to Methanol
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Zn 负载量对 PdZn 催化剂 CO2 加氢制甲醇选择性的影响

DOI:
10.1007/s10562-023-04437-5
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发表时间:
2023
期刊:
影响因子:
2.8
通讯作者:
Lawes N
Lawes N
中科院分区:
化学4区
文献类型:
--
作者:
Lawes N

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研究了PdZn/TiO2催化剂在二氧化碳加氢制甲醇反应中的催化性能。以二氧化钛为载体,改变Pd和Zn的比例对催化剂的催化性能有很大影响。采用化学气相浸渍法制备了PdZn合金。X射线衍射、X射线光电子能谱和扫描电子显微镜分析表明,在不同PdZn摩尔比的情况下,PdZn合金的结构发生了变化。与单金属Pd/TiO2相比,引入低负载量的锌极大地改变了产品的选择性。当Pd与Zn合金化的摩尔比超过总的Zn/Pd = 1时,甲醇的选择性得到提高。因此,对于提高甲醇生产率,锌负载量高于1:1β-PdZn合金的化学计量形成所需的锌负载量是至关重要的。
PdZn/TiO2catalysts have been investigated for the hydrogenation of CO2to methanol. Varying the ratio of Pd and Zn using TiO2as a support has a dramatic effect on catalytic performance. Chemical vapour impregnation was used to produce PdZn alloys on TiO2and X-ray diffraction, X-ray photoelectron spectroscopy, and scanning transmission electron microscopy revealed changes in the structure at varying total PdZn molar ratios. Compared to monometallic Pd/TiO2, introducing a low loading of Zn drastically changes product selectivity. When Pd is alloyed with Zn above a total Zn/Pd = 1 molar ratio, methanol selectivity is improved. Therefore, for enhanced methanol productivity, it is crucial for the Zn loading to be higher than that required for the stoichiometric formation of the 1:1 β-PdZn alloy.Graphical Abstract
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