催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (1): 34-38.

• 研究论文 • 上一篇    下一篇

MCM-22和ITQ-2分子筛负载型催化剂加氢裂化性能的对比研究

刘百军1,冯乐刚2,侯辉娟1,高山松1,查显俊1   

  1. 1 中国石油大学(北京)中国石油天然气集团公司催化重点实验室, 北京 102249; 2 中国石油兰州石化公司思达公司精化厂, 甘肃兰州 730060
  • 收稿日期:2007-01-25 出版日期:2007-01-25 发布日期:2010-08-28

Comparative Study on Hydrocracking over MCM-22 and ITQ-2 Zeolite-Supported Catalysts

LIU Baijun1*, FENG Legang2, HOU Huijuan1, GAO Shansong1, ZHA Xianjun1   

  1. 1 Key Laboratory of Catalysis of CNPC, China University of Petroleum, Beijing 102249, China; 2 Sida Refine Chemical Plant of Lanzhou Petrochemical Company, PetroChina, Lanzhou 730060, Gansu, China
  • Received:2007-01-25 Online:2007-01-25 Published:2010-08-28

PDF

846

被引次数

31

摘要： 以MCM-22和ITQ-2分子筛为载体, WNi为活性组分,制得两种负载型催化剂,考察了两种催化剂的加氢裂化性能,并通过N2吸附、氨程序升温脱附和原位红外光谱对催化剂进行了表征. 减压瓦斯油加氢裂化反应结果表明, WNi/ITQ-2的加氢裂化活性高于WNi/MCM-22, 并且前者的反应温度相对较低. WNi/ITQ-2具有高催化活性是因为ITQ-2分子筛具有空旷的次级结构和较多的可接近的酸性位; 中油选择性高是因为空旷的次级结构使裂化产物快速离开酸性位而避免了二次裂化.

关键词: MCM-22分子筛, ITQ-2分子筛, 钨, 镍, 减压瓦斯油, 加氢裂化, 次级结构

Abstract: A series of supported WNi catalysts for hydrocracking of vacuum gas oil (VGO) were prepared using ITQ-2 and MCM-22 zeolites as supports. The catalysts were characterized by temperature-programmed desorption of ammonia, infrared spectroscopy of pyridine adsorption, and nitrogen adsorption. The acidities of WNi/MCM-22 and WNi/ITQ-2 catalysts were similar; but the surface area and pore volume of WNi/ITQ-2 were larger than those of WNi/MCM-22. The results of VGO hydrocracking indicated that WNi/ITQ-2 catalysts had higher catalytic activity and selectivity for middle distillates. The higher activity was due to the large secondary pore structure of the ITQ-2 zeolite and its rich accessible acidic centers. The reason for the higher selectivity was that products left acid centers rapidly and secondary cracking was avoided because of the large secondary structure.

Key words: MCM-22, ITQ-2, tungsten, nickel, vaccum gas oil, hydrocracking, secondary structure