关键词: CO2辅助老化, 浆态床, CuO/ZnO/Al2O3催化剂, 甲醇合成

Abstract: The CuO/ZnO/Al2O3 catalysts were prepared by co-precipitation，and the effects of CO2 addition during the aging process on the phase composition of precursors，the microstructure of the calcined catalysts and catalytic performance for slurry phase methanol synthesis were investigated. The characterization by XRD，FT-IR，DTG，H2-TPR and XPS showed that adding CO2 helps to keep the mother liquor pH close to neutral，and generates CO32? ions，thus to facilitate Zn2+ precipitate and to promote Cu2+ into Zn5(CO3)2(OH)6 lattice substitution of Zn2+ formation the aurichalcite(Zn,Cu)5 (CO3)2(OH)6，leading to the improvement of content in precursors. While the catalyst is calcined，it exhibits a strong interaction between CuO and ZnO，well dispersion of CuO crystal particles around ZnO surface，and the best catalytic performance，including the methanol space-time yield (STY) and the stability. While the volume flow of CO2 was 40 mL/min，the methanol space-time yield (STY) and deactivation rate of the catalyst were 302.45 g/(kg?h) and 0.15%/d，respectively. Compared with the catalyst prepared without adding CO2 in the aging process，the methanol STY and deactivation rate of the catalyst were increased and decreased by 7.36% and 28.57%，respectively。

Key words: CO2 assisted aging, slurry reactor, CuO/ZnO/Al2O3 catalyst, methanol synthesis