Citation: DENG Hao-yue, GAO Zhi-hua, HUANG Wei. Effect of heat treatment time on the performance of CuZnAl catalysts in the synthesis of higher alcohols from syngas[J]. Journal of Fuel Chemistry and Technology, ;2019, 47(5): 532-539. shu

Effect of heat treatment time on the performance of CuZnAl catalysts in the synthesis of higher alcohols from syngas

Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China

Corresponding author: GAO Zhi-hua, gaozhihua@tyut.edu.cn
Received Date: 25 January 2019
Revised Date: 19 March 2019

Fund Project: Natural Science Foundation of Shanxi Province 201601D011021The project was supported by the National Natural Science Foundation of China (21336006) and Natural Science Foundation of Shanxi Province (201601D011021, 201601D202017)Natural Science Foundation of Shanxi Province 201601D202017the National Natural Science Foundation of China 21336006

Figures(6)

A series of CuZnAl catalysts were prepared by the complete liquid-phase method with different heat treatment times and characterized by XPS, XRD, H₂-TPR, NH₃-TPD-MS and N₂ adsorption-desorption; their catalytic performances in the synthesis of higher alcohols from syngas were investigated in a slurry bed reactor. The results indicate that an increase in the heat treatment time can enhance the interaction between the Cu and Al species and alter the amount of Cu⁺ species over the CuZnAl catalysts, influencing the synergistic effect of Cu⁺-Cu⁰ sites. In addition, with the increase of heat treatment time, the surface acidity of CuZnAl catalyst decreases, accompanying with an increase in the pore volume and pore size; small amount of surface weak acid sites, large pore volume and large pore size are beneficial to the formation of higher alcohols. The CuZnAl catalyst obtained by heat-treating for 7 h exhibits excellent performance in the synthesis of higher alcohols, with a CO conversion of 38.1% and a higher alcohols mass fraction of 65.9% in the total alcohols.
- complete liquid-phase method,
- CuZnAl catalyst,
- heat treatment time,
- higher alcohols,
- Cu⁺-Cu⁰
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