Journal of Inorganic Materials ›› 2022, Vol. 37 ›› Issue (10): 1058-1064.DOI: 10.15541/jim20220093

• RESEARCH ARTICLE • Previous Articles     Next Articles

Heteroatom-doped Biochar for Direct Dehydrogenation of Propane to Propylene

GAN Hongyu1(), FENG Yan1, YANG Dehong1, TIAN Yubin1, LI Yang1, XING Tao2, LI Zhi2,3, ZHAO Xuebo1, DAI Pengcheng1()   

  1. 1. College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
    2. New Energy Division, Shandong Energy Group Co., Ltd., Jining 273500, China
    3. School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
  • Received:2022-02-28 Revised:2022-03-26 Published:2022-10-20 Online:2022-04-07
  • Contact: DAI Pengcheng, associate professor. E-mail: dpcapple@upc.edu.cn
  • About author:GAN Hongyu (1998-), male, Master candidate. E-mail: hongyugan@163.com
  • Supported by:
    National Natural Science Foundation of China(51702365);Key Research and Development Projects in Shandong Province(2019GGX102056)

Abstract:

Carbon materials have been widely used in various catalytic reactions due to their excellent properties, such as low cost and good chemical/ thermal stability. In this study, nitrogen-doped, boron-doped, and boron-nitrogen co-doped biochars were prepared by in-situ gas-phase doping strategy using natural absorbent cotton as the raw materials. In the reaction of direct dehydrogenation of propane to propylene, the heteroatom-doped biochar showed higher propane conversion and propylene selectivity than the undoped biochar. It was also found that the catalytic performance of nitrogen and boron independently doped biochar was better than that of boron and nitrogen co-doped biochar. The nitrogen-doped biochar exhibited the best catalytic performance of which, at the reaction temperature of 600 ℃, the propane conversion reached 17.6%, and the olefins yield was 14.8%. After dehydrogenation reaction for 12 h, the catalyst’s performance exhibited no apparent declination. The characterization results revealed that nitrogen doping and boron doping in biochars could transform many C-O groups on the surface of biochar into C=O groups at an advantage of propane dehydrogenation activity, which inhibits the C-C bond breaking in the reaction process and improves the selectivity of propylene. Furthermore, duo to biochars rich in resources and low cost, they would promote the industrialization of direct dehydrogenation of propane.

Key words: biochar, heteroatom-doping, direct dehydrogenation, propane, propylene

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