Synergistic Pd–In2O3 catalysts are promising candidates for producing methanol via CO2 hydrogenation, and the metal phases in them can be tuned by thermal reduction treatment affecting the catalytic activity significantly. This work presents a comprehensive investigation to gain an insight into the effect of thermal reduction temperature on the variation and interaction of Pd and In2O3 phases supported on CeO2 (viz., PdIn/CeO2) and their correlations with CO2 hydrogenation toward methanol synthesis. The findings show that Pd/In‐rich PdIn alloys and In2O3 with relatively strong interaction are key phases (by reducing the PdIn/CeO2 at 300°C) for promoting methanol formation, leading to a high selectivity to methanol at 78.9% and space–time yield (STY) of 3.6 gCH3OH gPdIn−1 h−1. A further increase in reduction temperature (from 300 to 500°C) promoted the formation of homogenized PdIn intermetallic alloys with significantly poor ability for H2 dissociation and CO2 activation, and hence poor methanol yield.

中文翻译：

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通过热还原调节双金属 PdIn/CeO2 催化剂的活性以改善通过 CO2 加氢合成甲醇


协同Pd-In2O3催化剂是通过CO2加氢生产甲醇的有前途的候选者，并且其中的金属相可以通过热还原处理来调节，从而显着影响催化活性。这项工作进行了全面的研究，以深入了解热还原温度对 CeO2 上负载的 Pd 和 In2O3 相（即 PdIn/CeO2）的变化和相互作用的影响，以及它们与 CO2 加氢合成甲醇的相关性。研究结果表明，具有较强相互作用的Pd/In富PdIn合金和In2O3是促进甲醇形成的关键相（通过在300°C还原PdIn/CeO2），导致甲醇选择性高达78.9%，并且空间- 3.6 gCH3OH gPdIn−1 h−1 的时间产量 (STY)。还原温度的进一步升高（从300℃到500℃）促进了均质PdIn金属间合金的形成，其H2解离和CO2活化能力明显较差，因此甲醇收率较差。