CO2 Hydrogenation to Methanol over PdZnZr Solid Solution: Effects of the PdZn Alloy and Oxygen Vacancy
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作者
CATALYSTS; AROMATICS; DRIFTS; PD/ZNO; SITES; GAS; ZNO
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刊物名称
ACS Appl. Energ. Mater.
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年、卷、文献号
2021, 4,
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关键词
CATALYSTS; AROMATICS; DRIFTS; PD/ZNO; SITES; GAS; ZNO
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摘要
Utilization of CO2 with renewable hydrogen to produce value-added chemicals is highly desirable to reduce the dependence on fossil fuels. Methanol is a key intermediate for hydrocarbon products as they require a high methanol selectivity at high temperature to connect the methanol-to-olefin and methanol-to-aromatic processes. To improve the performance of CO2 hydrogenation at a higher temperature, this study prepared a 0.1% Pd/ZnZr catalyst using the coprecipitation method, which showed an 87% methanol selectivity and a space time yield of 735 g(methanol) kg(cat)(-1) h(-1) at 320 degrees C, significantly higher than that of the binary ZnZr solid solution (434 g(methanol) kg(cat)(-1) h(-1)). The characterization of the catalyst revealed that Pd2+ species formed a PdZn alloy from the ZrO2 lattice. More oxygen vacancies were generated on the surface, which enhanced the CO2 adsorption and activation capacity and then led to the formation of a higher amount of *HCOO species and better catalytic performance.
