Catalytic upgrading of CO2 to value-added chemicals is an important challenge within the chemical sciences. Of particular interest are catalysts which are both active and selective for the hydrogenation of CO2 to methanol. PdZn alloy nanoparticles supported on TiO2 via a solvent-free chemical vapour impregnation method are shown to be effective for this reaction. This synthesis technique is shown to minimise surface contaminants, which are detrimental to catalyst activity. The effect of reductive heat treatments on both structural properties of PdZn/TiO2 catalysts and rates of catalytic CO2 hydrogenation are investigated. PdZn nanoparticles formed upon reduction showed high stability towards particle sintering at high reduction temperature with average diameter of 3-6 nm to give 1710 mmol kg-1 h of methanol. Reductive treatment at high temperature results in the formation of ZnTiO3 as well as PdZn, and gives the highest methanol yield.

中文翻译：

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无溶剂合成PdZn / TiO2催化剂，用于将CO2加氢为甲醇。

将CO2催化转化为增值化学品是化学科学领域的一项重要挑战。特别令人感兴趣的是对于将CO 2加氢为甲醇既具有活性又具有选择性的催化剂。通过无溶剂化学气相浸渍法负载在TiO2上的PdZn合金纳米颗粒显示出对该反应有效。该合成技术显示出最小化对催化剂活性有害的表面污染物。研究了还原热处理对PdZn / TiO2催化剂的结构性能和催化CO2加氢速率的影响。还原后形成的PdZn纳米颗粒在高还原温度下对颗粒烧结表现出很高的稳定性，平均直径为3-6 nm，得到1710 mmol kg-1 h的甲醇。