SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2018, Vol. 26 ›› Issue (6): 1278-1284.DOI: 10.1016/j.cjche.2018.03.001

• Catalysis • Previous Articles     Next Articles

Selective propylene epoxidation in liquid phase using highly dispersed Nb catalysts incorporated in mesoporous silicates

Wenjuan Yan1, Yuhui Wu1, Xiang Feng1, Chaohe Yang1, Xin Jin1, Jian Shen2   

  1. 1 State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, Qingdao 266580, China;
    2 Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, China
  • Received:2017-11-30 Revised:2018-03-05 Online:2018-08-03 Published:2018-06-28
  • Contact: Chaohe Yang,E-mail address:yangch@upc.edu.cn;Jian Shen,E-mail address:js_xtuhzy@xtu.edu.cn
  • Supported by:

    Supported by the China Postdoctoral Science Foundation (2017 M612374), the Natural Science Foundation of Shandong Province (ZR2017BB007), the Postdoctoral Research Funding of Shandong Province (201703016), the Qingdao Postdoctoral Research Funding (BY20170210), the Fundamental Research Funding of Qingdao (17-1-1-67-jch, 17-1-1-80-jch), the Fundamental Research Funds for the Central Universities (18CX02145A, 17CX02017A), the New Faculty Start-up Funding from China University of Petroleum (YJ201601058) and the Natural Science Foundation of China (21606254).

Selective propylene epoxidation in liquid phase using highly dispersed Nb catalysts incorporated in mesoporous silicates

Wenjuan Yan1, Yuhui Wu1, Xiang Feng1, Chaohe Yang1, Xin Jin1, Jian Shen2   

  1. 1 State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, Qingdao 266580, China;
    2 Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, China
  • 通讯作者: Chaohe Yang,E-mail address:yangch@upc.edu.cn;Jian Shen,E-mail address:js_xtuhzy@xtu.edu.cn
  • 基金资助:

    Supported by the China Postdoctoral Science Foundation (2017 M612374), the Natural Science Foundation of Shandong Province (ZR2017BB007), the Postdoctoral Research Funding of Shandong Province (201703016), the Qingdao Postdoctoral Research Funding (BY20170210), the Fundamental Research Funding of Qingdao (17-1-1-67-jch, 17-1-1-80-jch), the Fundamental Research Funds for the Central Universities (18CX02145A, 17CX02017A), the New Faculty Start-up Funding from China University of Petroleum (YJ201601058) and the Natural Science Foundation of China (21606254).

Abstract: Selective propylene epoxidation to propylene oxide (PO) with hydrogen peroxide (H2O2) was carried out in a catalytic semi-batch reactor. High propylene epoxidation activity (44 h-1) was observed over Nb based mesoporous silicate materials Nb-TUD-1 under mild operating conditions. The physical and chemical properties of the Nb based silicates characterized using BET, FTIR, TPD, TEM and UV-Vis revealed that the site isolation and surface acidity are crucial for PO production. Catalyst synthesis methods were investigated for their effects on PO productivity, PO selectivity and H2O2 utilization efficiency. It is found that Nb-TUD-1 material synthesized by the sol-gel method is more active and selective than impregnated materials for liquid phase propylene epoxidation. Surface characterization confirms that thus synthesized Nb-TUD-1 catalysts have more Lewis acidity and less Bronsted acidity compared to the catalysts by impregnation.

Key words: Propylene, Epoxidation, Propylene oxide, TUD-1, Niobium, mesoporous materials

摘要: Selective propylene epoxidation to propylene oxide (PO) with hydrogen peroxide (H2O2) was carried out in a catalytic semi-batch reactor. High propylene epoxidation activity (44 h-1) was observed over Nb based mesoporous silicate materials Nb-TUD-1 under mild operating conditions. The physical and chemical properties of the Nb based silicates characterized using BET, FTIR, TPD, TEM and UV-Vis revealed that the site isolation and surface acidity are crucial for PO production. Catalyst synthesis methods were investigated for their effects on PO productivity, PO selectivity and H2O2 utilization efficiency. It is found that Nb-TUD-1 material synthesized by the sol-gel method is more active and selective than impregnated materials for liquid phase propylene epoxidation. Surface characterization confirms that thus synthesized Nb-TUD-1 catalysts have more Lewis acidity and less Bronsted acidity compared to the catalysts by impregnation.

关键词: Propylene, Epoxidation, Propylene oxide, TUD-1, Niobium, mesoporous materials