Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (01): 70-74.doi: 10.3866/PKU.WHXB20030116

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Modification of CoMo/TiO2-Al2O3 Catalyst by Gas Phase Fluorination

Ling Lan;Wang Xu-Xu;Weng Hao;Yang Qing;Fu Xian-Zhi   

  1. Research Institute of Photocatalysis, National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002
  • Received:2002-04-15 Revised:2002-05-27 Published:2003-01-15
  • Contact: Wang Xu-Xu E-mail:xwang@fzu.edu.cn

Abstract: The effect of support pre-fluorination on the physical properties and catalytic activity of MoCo/TiO2-Al2O3 was studied by XRD, N2 adsorption ,and thiophene hydrodesulfurization (HDS).Freon (CFC-12) in wet air or in NH4F solution was used as fluorinating reagents. The influences of CFC-12 content, effect of fluorination temperature and fluorinating time on the structure and hydrodesulfurization activity of the catalysts were examined systematically. The results revealed that hydrodesulfurization activity of the catalyst fluorinated by 1% CFC-12 at 623 K was obviously improved with an increase of 20%~30 % as compared with that of the unfluorinated catalyst, the commercially available BY2 catalyst, and NH4F-fluorinated catalysts. Moreover, the catalyst fluorinated by the Freon gas presented excellent stability on catalytic activity and structure.

Key words: Hydrodesulfurization(HDS), Freon, Gas phase fluorination, CoMo/ TiO2-Al2O3 catalyst