华南理工大学学报(自然科学版) ›› 2010, Vol. 38 ›› Issue (4): 83-86.doi: 10.3969/j.issn.1000-565X.2010.04.016

• 材料科学与技术 • 上一篇    下一篇

偏高岭土基磷酸硅铝分子筛合成及其催化性能研究

钟明峰 张志杰 周新涛   

  1. 华南理工大学 材料科学与工程学院, 广东 广州 510640
  • 收稿日期:2009-05-05 修回日期:2009-09-09 出版日期:2010-04-25 发布日期:2010-04-25
  • 通信作者: 钟明峰(1976-),男,博士,讲师,主要从事生态环境材料研究. E-mail:mfzhong@seut.edu,cn
  • 作者简介:钟明峰(1976-),男,博士,讲师,主要从事生态环境材料研究.
  • 基金资助:

    广东省科技计划项目(2008A030202006)

Synthesis and Catalytic Performance of Silicoaluminophosphate Molecular Sieves from Metakaolin

Zhong Ming-feng  Zhang Zhi-jie  Zhou Xin-tao   

  1. School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2009-05-05 Revised:2009-09-09 Online:2010-04-25 Published:2010-04-25
  • Contact: 钟明峰(1976-),男,博士,讲师,主要从事生态环境材料研究. E-mail:mfzhong@seut.edu,cn
  • About author:钟明峰(1976-),男,博士,讲师,主要从事生态环境材料研究.
  • Supported by:

    广东省科技计划项目(2008A030202006)

摘要: 以偏高岭土兼作Al、Si源,H3PO4作磷源,十六烷基三甲基溴化铵-三乙醇胺为复合模板剂,采用分段晶化的方法制备磷酸硅铝分子筛。利用X射线衍射分析、扫描电镜、XPS及NH3-TPD等手段对产物进行了表征。实验结果表明:产物为柱状的磷酸硅铝分子筛,其晶粒尺寸大约为20 μm×5 μm×5 μm,其晶体结构中P:Al:Si=1:1.19:0.67(摩尔比),硅含量较高;采用分段晶化方式制备的SAPO-5分子筛的总酸量为578.0 μmol/g高于一段晶化方式制备的SAPO-5分子筛的总酸量;采用分段晶化生成的SAPO-5分子筛的催化正丁烷异构化反应初始活性可达到24.8 %,远高于一段晶化制备的SAPO-5分子筛的初始活性14.1 %。

关键词: 偏高岭土, 水热, 磷酸硅铝分子筛, 催化性能

Abstract:

Silicoaluminophosphate(SAPO-5) molecular sieves were synthesized respectively by the piecewise and one-step crystalline methods,with metakaolin as the silicon and aluminum sources,phosphoric acid as the phosphorus source and with triethylamine combined with hexadecyl trimethyl ammonium bromide as the template agent.Then,the prepared molecular sieves were characterized by means of XRD,SEM,XPS and NH3-TPD analysis.The results show that the product prepared by the piecewise crystalline method is of uniform pillar-like morphology,large size(about 20μm×5μm×5μm),proper P∶Al∶Si molar ratio(1∶1.19∶0.67),high Si content and higher total acid content(578.0μmol/g),and that its initial activity(24.8%) is much higher than that of the product prepared by the one-step method(14.1%).

Key words: metakaolin, crystallization, silicoaluminophosphate molecular sieve, catalytic performance