催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (12): 1112-1116.

• 研究论文 • 上一篇    下一篇

FCC硫转移剂MgAlCuFe复合氧化物的结构与性能: 金属盐前体的影响

程文萍,王雯娟,刘玲,赵月昌,杨建国,何鸣元   

  1. 华东师范大学化学系, 上海市绿色化学与化工过程绿色化重点实验室, 上海 200062
  • 收稿日期:2007-12-25 出版日期:2007-12-25 发布日期:2007-12-25

Properties of MgAlCuFe Complex Oxides for FCC Desulfurization: Effect of Metal Salt Precursors

CHENG Wenping, WANG Wenjuan, LIU Ling, ZHAO Yuechang, YANG Jianguo*, HE Mingyuan   

  1. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai 200062, China
  • Received:2007-12-25 Online:2007-12-25 Published:2007-12-25

PDF

985

被引次数

23

摘要： 分别以硝酸盐、盐酸盐和硫酸盐为金属盐前体,采用共沉淀法合成了MgAlCuFe类水滑石前驱体,经过700 ℃焙烧6 h后,制得三种新型FCC硫转移剂. 运用X射线衍射、热重、氮气吸附和红外光谱对这三种硫转移剂的结构和性能进行了表征,并采用改装的WRP-3热重天平评价了其氧化吸硫和还原脱硫的性能. 结果表明,三种金属盐均可得到结构规整的类水滑石前驱体,经过焙烧后得到复合氧化物MgAlCuFe. 与采用盐酸盐和硫酸盐作前体相比,由硝酸盐制得的硫转移剂具有较大的比表面积,其饱和吸附硫容和氧化吸硫速率均较高, 6 min可达到1.54 g/g的饱和吸附能力,同时具有较强的还原脱硫能力.

关键词: 硫转移剂, 类水滑石, 复合氧化物, 金属盐, 氧化吸硫, 还原脱附

Abstract: A series of MgAlCuFe complex oxides used for the removal of SOx from FCC flue gas were prepared by decomposition of MgAlCuFe hydrotalcite precursors at 700 ℃ for 6 h. The influence of different metal salts in the sulfur transfer catalyst was investigated.X-raydiffraction, thermogravimetric analysis, N2 adsorption, and infrared spectroscopy showed that all the sulfur transfer catalysts exhibited a better dispersion of metal oxides in the matrix. The results of the SO2 adsorption-reduction test showed that the novel catalyst MgAlCuFe prepared from nitrates reached 1.54 g/g of total saturation adsorption capacity in6 minunder the conditions similar to those of typical FCC. These catalysts achieved high oxidative adsorption rate, short saturation time, and large reductive capacity.

Key words: sulfur transfer catalyst, hydrotalcite-like compound, complex oxide, metal salt, sulfur oxidative adsorption, reductive desorption