Abstract

PdZn/TiO₂ catalysts have been investigated for the hydrogenation of CO₂ to methanol. Varying the ratio of Pd and Zn using TiO₂ as a support has a dramatic effect on catalytic performance. Chemical vapour impregnation was used to produce PdZn alloys on TiO₂ and 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

中文翻译：

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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

摘要

PdZn/TiO ₂催化剂已被研究用于CO ₂加氢生成甲醇。_{使用TiO 2}作为载体改变Pd和Zn的比例对催化性能具有显着影响。采用化学气相浸渍法在TiO ₂上生产PdZn 合金，X 射线衍射、X 射线光电子能谱和扫描透射电子显微镜揭示了不同总PdZn 摩尔比下结构的变化。与单金属Pd/TiO ₂相比，引入低负载量的Zn会极大地改变产物选择性。当 Pd 与 Zn 的总摩尔比高于 Zn/Pd = 1 时，甲醇选择性会提高。因此，为了提高甲醇生产率，Zn 负载量必须高于化学计量形成 1:1 β-PdZn 合金所需的负载量。

图形概要