高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (6): 1846.doi: 10.7503/cjcu20200883

• 物理化学 • 上一篇    下一篇

CuAl2O4尖晶石结构对浆态床一氧化碳加氢性能的影响

闫鹏泉, 王竟荣, 沈亚星, 左志军, 高志华(), 黄伟   

  1. 太原理工大学省部共建煤基能源清洁高效利用国家重点实验室, 太原 030024
  • 收稿日期:2020-12-21 出版日期:2021-06-10 发布日期:2021-06-08
  • 通讯作者: 高志华 E-mail:gaozhihua@tyut.edu.cn
  • 基金资助:
    山西省高等学校科技成果转化培育项目(2020CG012);山西省自然科学基金(201601D011021)

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)

摘要:

采用固相法、 共沉淀法、 柠檬酸法和溶胶-凝胶法制备了CuAl2O4尖晶石, 在浆态床反应器上对其进行一氧化碳加氢反应活性评价, 并对CuAl2O4尖晶石的结构进行了表征. 研究发现, 不同方法制备的CuAl2O4尖晶石在织构参数、 表面富集程度和分解还原性能上存在明显差异, 进而影响其催化性能. 固相法所制尖晶石的孔径和孔容大, CuAl2O4表面富集程度最高, 致使尖晶石分解不完全, 但是其分解释放的CuO全部被还原, 且Cu+/Cu0占比相当高, 有利于提高产物中C2+OH选择性(达到31.1%). 而表面富集程度相对低的其它3种尖晶石分解完全, 但部分CuO未被还原, 且还原产物中Cu0占比提高, Cu0γ-Al2O3发生协同作用促进二甲醚的生成, 其选择性最高可达72.9%.

关键词: 铝酸铜, 一氧化碳加氢, 二甲醚, 低碳醇, 浆态床

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

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