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酸碱性硅溶胶对浆状Cu/Zn/Al催化剂性能的影响

孙凯,  张小雨,  张琳,  边仲凯,  黄伟,  赵志换

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文章导航 > 燃料化学学报（中英文）  > 2015 >  43(10): 1221-1229
孙凯, 张小雨, 张琳, 边仲凯, 黄伟, 赵志换. 酸碱性硅溶胶对浆状Cu/Zn/Al催化剂性能的影响[J]. 燃料化学学报（中英文）, 2015, 43(10): 1221-1229.
引用本文: 孙凯, 张小雨, 张琳, 边仲凯, 黄伟, 赵志换. 酸碱性硅溶胶对浆状Cu/Zn/Al催化剂性能的影响[J]. 燃料化学学报（中英文）, 2015, 43(10): 1221-1229.
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SUN Kai, ZHANG Xiao-yu, ZHANG Lin, BIAN Zhong-kai, HUANG Wei, ZHAO Zhi-huan. Influence of acid and alkaline silica sol on the performance of Cu/Zn/Al slurry catalysts[J]. Journal of Fuel Chemistry and Technology, 2015, 43(10): 1221-1229.
Citation: SUN Kai, ZHANG Xiao-yu, ZHANG Lin, BIAN Zhong-kai, HUANG Wei, ZHAO Zhi-huan. Influence of acid and alkaline silica sol on the performance of Cu/Zn/Al slurry catalysts[J]. Journal of Fuel Chemistry and Technology, 2015, 43(10): 1221-1229.
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酸碱性硅溶胶对浆状Cu/Zn/Al催化剂性能的影响

  • 1.

    太原理工大学 煤科学与技术教育部和山西省重点实验室, 山西 太原 030024;

  • 2.

    太原理工大学 化学与化工学院, 山西 太原 030024

基金项目: 国家自然科学基金重点项目(21336006),国家自然科学基金面上项目(21176176)和高等学校博士学科点专项(优先发展领域)(20111402130002)资助
详细信息
    通讯作者:

    黄伟,Tel:13934149467,E-mail:huangwei@tyut.edu.cn;赵志换,Tel:(0351)6018534,E-mail:zhaozhihuan@tyut.edu.cn.

  • 中图分类号: O643

Influence of acid and alkaline silica sol on the performance of Cu/Zn/Al slurry catalysts

  • 1.

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

  • 2.

    College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Funds: The project was supported by the National Natural Science Foundation of China(21336006), General Program of National Natural Science Foundation of China (21176176), and Research Fund for the Doctoral Program of Higher Education of China(20111402130002).

    摘要
  • 摘要: 在完全液相法研究发现的基础上,选用酸、碱性硅溶胶,制备Cu/Zn/Al/Si浆状催化剂,采用X射线衍射(XRD)、氢气程序升温还原(H2-TPR)、红外光谱分析(FT-IR)、氮气吸附、氨气程序升温脱附(NH3-TPD)、X射线光电子能谱(XPS)、透射电子显微镜(TEM)等对催化剂进行了表征。结果表明,两类硅溶胶引入Cu/Zn/Al催化体系后,与前驱体制备环境一致的酸性硅溶胶能显著提高催化剂的CO的转化率和二甲醚的选择性,最高分别可达65.38%和76.26%。酸性硅溶胶削弱了Cu与其他组分的相互作用力,催化剂表现为易于还原、晶粒度大,暴露出丰富的反应所需的Cu0活性晶面。此外,硅溶胶的酸碱性质还改变催化剂酸中心的强度和数量且使强、弱酸中心均向低温方向迁移,酸性硅胶制备的催化剂中弱酸中心数量多,进而提高了催化剂活性和二甲醚的选择性。大比表面积和介孔孔隙丰富的催化剂孔结构亦有利于催化剂活性和二甲醚选择性的提高。
    Abstract: A series of Cu/Zn/Al/Si slurry catalysts were prepared by the complete liquid-phase technology with acid and alkaline silica sol in the paper. The catalysts are characterized by means of XRD, H2-TPR, FT-IR, BET, NH3-TPD, XPS and TEM. When the acid silica sol is added, which has the similar environment with the process of precursor preparation, the conversion of CO and selectivity of dimethyl ether reach maxiumum, being 65.38% and 76.26% respectively. The acid silica sol weakens the force between Cu and other components, resulting in the Cu component is easy to be reduced and more active lattice planes of Cu0 on the catalyst are exposed. The acid/alkaline properties of silica sol influence acid site strength and the number of acid sites of catalysts and make both strong acidic sites and the weak acidic sites migrate to lower temperature position. In DME synthesis reaction, it is found that the acid silica sol can increase the ratio of the weak acidic sites to the strong acidic sites on the catalysts, which promotes dehydration performance of methanol and the selectivity of DME. In addition, the catalysts with large specific surface area and mesoporous pore structure are favorable for the activity and selectivity of DME.
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  • 收稿日期:  2015-05-28
  • 修回日期:  2015-07-19
  • 刊出日期:  2015-10-31

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