A series of CuO-Bi2O3/Al2O3 catalysts doped with different Ce contents are prepared through the co-precipitation method,and the effects of Ce on the structure of catalysts and their performance in formaldehyde ethynylation are studied by using XRD,H2-TPR,SEM,and XPS techniques.Studies show that the synergistic effect between Ce and Cu improves the dispersion of CuO on the carrier surface of the catalysts,and also promotes the reduction and activation process of CuO,which making CuO in the catalysts efficiently convert into cuprous acetylide,the active cuprous species,while maintaining high dispersion and stability throughout the reaction process.Therefore,the catalysts modified with Ce exhibit higher catalytic activity.Ce5-CB/Al2O3 catalyst achieves a 93.7％formaldehyde conversion rate and a 98.1％of 1,4-butylenediol selectivity in the formaldehyde ethynylation,which also remains stable after six cycles,not showing significant loss in catalytic activity.
关键词
Ce掺杂/Ce-CB/Al2O3催化剂/协同作用/甲醛乙炔化
Key words
Ce doping/Ce-CB/Al2O3 catalyst/synergistic effect/formaldehyde ethynylation
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