催化学报

催化学报 ›› 2011, Vol. 32 ›› Issue (2): 250-257.DOI: 10.1016/S1872-2067(10)60172-6

• 研究论文 • 上一篇    下一篇

高负载量 LaMnOx/SBA-15 的制备及其催化甲苯燃烧性能

张泽凯, 梁一微, 任倩茹, 刘华彦, 陈银飞   

  1. 浙江工业大学化学工程与材料学院, 绿色化学合成技术国家重点实验室培育基地, 浙江杭州 310014
  • 收稿日期:2010-09-19 修回日期:2010-10-27 出版日期:2011-01-26 发布日期:2014-06-25

Preparation of Highly Loaded LaMnOx/SBA-15 Catalyst and Its Toluene Combustion Performance

ZHANG Zekai, LIANG Yiwei, REN Qianru, LIU Huayan, CHEN Yinfei*   

  1. State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
  • Received:2010-09-19 Revised:2010-10-27 Online:2011-01-26 Published:2014-06-25

PDF

1176

摘要： 采用逐层负载-孔道内氨/水蒸气原位羟化法制备了高负载量的 LaMnOx/SBA-15 催化剂, 并采用 X 射线衍射、N2 吸附-脱附和程序升温还原等技术对催化剂进行了表征, 考察了其催化甲苯燃烧的性能. 结果表明, 孔道内氨/水蒸气原位羟化提高了 LaMnOx 活性物种在 SBA-15 孔道内的分散度和还原性, 显著改善了高负载量的 LaMnOx/SBA-15 催化剂的活性. 在空速 5000 h–1 的条件下, 温度升至 205 oC 时甲苯转化率即可达 50%, 较之普通浸渍法制得的催化剂上甲苯达到该转化率所需温度降低了约 105 oC. 实验得到 LaMnOx/SBA-15 的适宜原位羟化处理温度为 60 oC, 处理时间 40 min.

关键词: 高负载量, 镧, 锰, 复合氧化物, SBA-15, 原位羟化, 催化燃烧, 甲苯

Abstract: A highly loaded LaMnOx/SBA-15 catalyst (60%) was prepared by step coating NH3/water vapor-induced internal hydrolysis (VIH) and characterized by X-ray diffraction, N2 adsorption-desorption, and temperature-programmed reduction (H2-TPR). Its catalytic performance for toluene combustion was also evaluated. The results showed that the VIH process clearly improved the activity of the LaMnOx/SBA-15 catalyst. Using a toluene concentration of 0.86% and a GHSV of 5000 h–1, a 50% toluene conversion was obtained at 205 °C for the LaMnOx/SBA-15 sample prepared by the VIH process. This temperature was 105 °C lower than that for the sample prepared by conventional impregnation. N2 adsorption-desorption and H2-TPR revealed that the VIH process improved the distribution of the LaMnOx active phase in the pores of SBA-15 and improved its reduction properties. The optimal VIH conditions were a temperature of 60 °C and a reaction time of 40 min.

Key words: highly loaded, lanthanum, manganese, composite oxide, SBA-15, vapor-induced internal hydrolysis, catalytic combustion, toluene