Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (6): 1846.doi: 10.7503/cjcu20200883

• Physical Chemistry • Previous Articles     Next Articles

Effect of CuAl2O4 Spinel Structure on CO Hydrogenation in Slurry Reactor

YAN Pengquan, WANG Jingrong, SHEN Yaxing, ZUO Zhijun, GAO Zhihua(), HUANG Wei   

  1. State Key Laboratory of Clean and Efficient Coal Utilization,Taiyuan University of Technology,Taiyuan 030024,China
  • Received:2020-12-21 Online:2021-06-10 Published:2021-06-08
  • Contact: GAO Zhihua E-mail:gaozhihua@tyut.edu.cn
  • Supported by:
    the Technological Achievements Programs of Higher Education Institutions in Shanxi, China(2020CG012);the National Natural Science Foundation of Shanxi Province, China(201601D011021)

Abstract:

The CuAl2O4 spinels were prepared by the solid-phase method, co-precipitation method, citric acid method, and sol-gel method. The activity of CO hydrogenation over CuAl2O4 spinel was evaluated in the slurry reactor. And the structure of CuAl2O4 spinel was characterized by XRD, BET, SEM, TEM, NH3-TPD-MS, H2-TPR and XPS. The results showed that CuAl2O4 spinel prepared by different methods had various texture parameters, surface enrichment degree, decomposition and reduction ability, which further affected the catalytic performance. The CuAl2O4 spinel prepared by the solid-phase method showed a larger pore size and pore volume, and the highest CuAl2O4 surface enrichment degree, resulting in incomplete decomposition of the spinel. However, CuO produce by the spinel decomposition was totally redyced, and the ratio of Cu+/Cu0 was relatively high, which favored the formation of higher alcohols. The selectivity of C2+OH in the product was as high as 31.1%. The other three spinels with relatively low CuAl2O4 surface enrichment were completely decomposed, but part of the CuO was not reduced. Moreover, the proportion of Cu0 was obviously increased. The synergistic effect of Cu0 and γ-Al2O3 was beneficial to the production of dimethyl ether(DME). The highest DME selectivity was up to 72.9%.

Key words: CuAl2O4, CO hydrogenation, Dimethyl ether, Lower alcohol, Slurry reactor

CLC Number: 

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