Structure and performance of Cu/ZrO2 catalyst for the synthesis of methanol from CO2 hydrogenation
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摘要: 采用低温氮气吸脱附、XRD、 TPR、In-situ IR和XPS等表征手段,对分步沉淀法、浸渍沉淀法和固态反应法制备的CuO/ZrO2催化剂进行表征,同时考察了其CO2加氢合成甲醇反应性能。结果表明,制备方法对CuO/ZrO2的物理结构和还原性能影响很大,其中浸渍沉淀法制备的催化剂Cu与ZrO2相互作用最强,并显示了较高的CO2转化率和甲醇收率。Cu与ZrO2相互作用的强弱直接影响CO2加氢合成甲醇反应性能的优劣,而催化剂的比表面积不是影响反应性能的主导因素。Abstract: Cu/ZrO2 catalysts were prepared through fractional precipitation, impregnation-precipitation and solid-state reaction methods and characterized by N2 sorption, XRD, TPR, in-situ IR and XPS techniques. Their catalytic performances in methanol synthesis from CO2 hydrogenation were investigated. The results showed that the physical structure and reducibility as well as the interaction between Cu and ZrO2 of a Cu/ZrO2 catalyst are greatly affected by the preparation method. The catalytic performance of Cu/ZrO2 is mainly determined by the interaction between Cu and ZrO2 rather than by the surface area. Compared with the catalysts prepared by other methods, the Cu/ZrO2 catalyst prepared by impregnation-precipitation is provided with higher CuO dispersion and stronger interaction between Cu and ZrO2; it also exhibits higher CO2 conversion and higher methanol yield when used as catalyst in the synthesis of methanol from CO2 hydrogenation.
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Key words:
- copper oxide /
- zirconia /
- methanol synthesis /
- carbon dioxide hydrogenation /
- impregnation-precipitation /
- XPS
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