微量Li助剂对Co/AC催化剂合成高碳醇性能的影响

doi:10.3866/PKU.WHXB201405301

Abstract

Abstract:

15Co_xLi/AC catalysts promoted by different trace amounts of Li doping were prepared by incipientwetness impregnation. The catalysts were investigated by means of CO hydrogenation and characterized by X-ray diffraction (XRD), temperature-programmed reduction (H₂-TPR), and temperature-programmed surface reaction (TPSR) techniques. The results show that CO conversion, selectivity towards C₅₊ hydrocarbons, selectivity towards mixed linear α-alcohols and the distribution of higher alcohols (C₆₊OH) in the alcohol products were improved by adding trace amounts of Li to the 15Co/AC catalysts. XRD, H₂-TPR, and TPSR results indicate that the existence of trace amounts of Li promotes weak interaction between Li and Co species, disperses the Co species of the catalysts, decreases the size of metallic Co particles, and promotes the formation of Co₂C species.

Key words: Syngas, Mixed linear α-alcohols, Co/AC catalyst, Trace amounts of Li doping, Co₂C species

DONG Wen-Da, ZHU He-Jun, DING Yun-Jie, PEI Yan-Peng, DU Hong, WANG Tao. Effect of Trace Amounts of Li Doping on Performance of Co/AC Catalysts for Syntheses of Mixed Linear α-Alcohols[J]. Acta Phys. -Chim. Sin. 2014, 30(9), 1745-1751. doi: 10.3866/PKU.WHXB201405301

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Effect of Trace Amounts of Li Doping on Performance of Co/AC Catalysts for Syntheses of Mixed Linear α-Alcohols

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