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TPAOH/NaOH混合碱体系对ZSM-5沸石的改性及其催化性能研究

李莎,  李玉平,  狄春雨,  张鹏飞,  潘瑞丽,  窦涛

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文章导航 > 燃料化学学报（中英文）  > 2012 >  40(05): 583-588
李莎, 李玉平, 狄春雨, 张鹏飞, 潘瑞丽, 窦涛. TPAOH/NaOH混合碱体系对ZSM-5沸石的改性及其催化性能研究[J]. 燃料化学学报（中英文）, 2012, 40(05): 583-588.
引用本文: 李莎, 李玉平, 狄春雨, 张鹏飞, 潘瑞丽, 窦涛. TPAOH/NaOH混合碱体系对ZSM-5沸石的改性及其催化性能研究[J]. 燃料化学学报（中英文）, 2012, 40(05): 583-588.
shu
LI Sha, LI Yu-ping, DI Chun-yu, ZHANG Peng-fei, PAN Rui-li, DOU Tao. Modification and catalyst performance of ZSM-5 zeolite by treatment with TPAOH/NaOH mixed alkali[J]. Journal of Fuel Chemistry and Technology, 2012, 40(05): 583-588.
Citation: LI Sha, LI Yu-ping, DI Chun-yu, ZHANG Peng-fei, PAN Rui-li, DOU Tao. Modification and catalyst performance of ZSM-5 zeolite by treatment with TPAOH/NaOH mixed alkali[J]. Journal of Fuel Chemistry and Technology, 2012, 40(05): 583-588.
shu

TPAOH/NaOH混合碱体系对ZSM-5沸石的改性及其催化性能研究

  • 1.

    太原理工大学 精细化工研究所, 山西 太原 030024;

  • 2.

    太原理工大学材料学院, 山西 太原 030024;

  • 3.

    太原科技大学 化学与生物工程学院, 山西 太原 030024;

  • 4.

    中国石油大学(北京)化工学院, 北京 102249

基金项目: 国家重点基础研究发展规划(973计划,2004CB217806);国家自然科学基金(20973123)。
详细信息
    通讯作者:

    李玉平, Tel: 0351-6010550-7, E-mail: yupingli123@163.com; 窦涛, Tel: 0351-010550-7, E-mail: dtao1@163.com。

  • 中图分类号: TQ423.93

Modification and catalyst performance of ZSM-5 zeolite by treatment with TPAOH/NaOH mixed alkali

  • 1.

    Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, China;

  • 2.

    College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;

  • 3.

    Institute of Chemical and Biological Technology, Taiyuan University of Science and Technology, Taiyuan 030024, China;

  • 4.

    College of Chemical Engineering, China University of Petroleum(Beijing), Beijing 102249, China

Funds: 国家重点基础研究发展规划(973计划,2004CB217806);国家自然科学基金(20973123)。

    摘要
  • 摘要: 采用四丙基氢氧化铵和氢氧化钠有机无机混合碱TPAOH/NaOH体系对ZSM-5分子筛进行改性处理,得到了具有介孔和微孔的ZSM-5分子筛。用XRD、N2吸附脱附、NH3-TPD、SEM等手段对改性后的产物进行表征。结果表明,碱处理ZSM-5分子筛会使分子筛同时脱硅和脱铝。当混合碱体系中总OH-浓度一定时,随TPA+/OH-比值的降低和处理时间的延长,均会使分子筛的微孔结构数量减少,介孔结构数量增加。同时,还会改变分子筛的酸性,TPA+/OH-比值适合的混合碱体系可在生成介孔的同时最大限度保留微孔结构,并减少分子筛的强酸数量,在甲醇制烯烃反应(MTO)中表现出较高的丙烯选择性。与无机碱NaOH相比,TPAOH对分子筛的改性速率较慢而且温和,具有可控性,可以起到孔道生长调节剂的作用。
    Abstract: The composites with mesoporous and microporous structure were obtained by treatment of ZSM-5 zeolite in mixed alkali aqueous solution of tetrapropylammonium hydroxide and inorganic base NaOH. The products were characterized by XRD, N2-adsorption/desorption, NH3-TPD, SEM and so on. The results showed that the alkaline solution would cause the zeolite desilication and dealumination and either decreasing the TPA+/OH- ratio or prolonging the alkali treatment time will cause reduction of micropore structure and increasement of mesopore amount increasingly while keeping the concentration of OH- at a fixed value. And meanwhile, the treatment also changed the acidity of zeolite. Mixed alkali treatment with proper TPA+/OH- ratio could preserve micropore structure to the maximum extent while formed the mesopore, reduce zeolite’s strong acid quantity and increase the selectivity of propylene when performanced on methanol-to-olefins (MTO) reaction. Compared with the inorganic base NaOH, the modification rate of zeolite by TPAOH was slower, milder and more controllable that could act as pore-growth moderator.
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    • 参考文献(16)
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出版历程
  • 收稿日期:  2011-07-03
  • 修回日期:  2011-09-28
  • 刊出日期:  2012-05-31

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