高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (1): 123.

• 研究快报 • 上一篇    下一篇

强酸促进的W/HZSM-5基催化剂上甲烷非氧化脱氢芳构化

曾金龙, 熊智涛, 林国栋, 张鸿斌   

  1. 厦门大学化学化工学院, 固体表面物理化学国家重点实验室, 厦门, 361005
  • 收稿日期:1997-08-18 出版日期:1998-01-24 发布日期:1998-01-24
  • 通讯作者: 张鸿斌
  • 作者简介:曾金龙,男,55岁,副教授.
  • 基金资助:

    国家自然科学基金、国家教育委员会博士点基金资助课题.

Non-oxidative Dehydro-aromatization of Methane over Strong Acid-promoted W/HZSM-5-based Catalysts

ZENG Jin-Long, XIONG Zhi-Tao, LIN Guo-Dong, ZHANG Hong-Bin   

  1. Institute of Chemistry and Chem. Eng., State Key Lab. for Phys. Chem. of the Solid Surface, Xiamen University, Xiamen, 361005
  • Received:1997-08-18 Online:1998-01-24 Published:1998-01-24

关键词: 甲烷, 脱氢芳构化, W-Zn(La, Nb)-H2SO4/HZSM-5催化剂, 芳烃

Abstract: Highly active and heat-resisting strong acid-promoted W/HZSM-5-based catalysts, W-Zn (La, Nb)-H2SO4/HZSM-5, for non-oxidative dehydro-aromatization of methane have been developed. Over a W-Zn-H2SO4/HZSM-5 catalyst and under the reaction conditions of 1123 K, 0. 1 MPa, and GHSV=1500 mL/h per gram cat., methane conversion (XCH4) reached 23%, with a selectivity to benzene at 97% and an amount of coking for 3 h operation at 0. 02% of the weight of the catalyst used. During a stability test at 1073 Kfor 3 h, XCH4 had been maintaind at about 21.5% over the W-Zn-H2SO4/HZSM-5 catalyst,whereas dropped gradually to 13% from 19% in the initial stage over the Mo-Zn-H2SO4/HZSM-5, demonstrating that the former has a better heat-resisting peculiarity than the latter. The results of investigation of optimization of the catalyst composition showed that the optimal W-loading on the HZSM-5[n-(Si)/n-(Al)=38] zeolite support was about 2.5%, and that an optimal match-ratio existed among the Wand the promoters, Zn (or La or Nb) and H2SO4. The experimental results also indicated that the promoting effects of Zn and La were more pronounced than Nb.

Key words: Methane, Dehydro-aromatizatlon, W-Zn (La, Nb)-H2SO4/HZSM-5 catalysts, Aromatic hydrocarbons

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