催化学报

催化学报 ›› 2013, Vol. 34 ›› Issue (1): 176-184.DOI: 10.1016/S1872-2067(11)60510-X

• 研究论文 • 上一篇    下一篇

以深度脱铁Fe-YNU-1分子筛为硅源制备Al-YNU-1及其形成机理

王鹏飞a,b, 李俊汾a, 董梅a, 秦张峰a, 王建国a, 樊卫斌a,?   

  1. a中国科学院山西煤炭化学研究所煤转化国家重点实验室, 山西太原030001; b中国科学院大学, 北京100049
  • 收稿日期:2012-11-14 修回日期:2012-12-10 出版日期:2013-01-23 发布日期:2013-01-23

Preparation and formation mechanism of Al-YNU-1 using highly acid-treated Fe-YNU-1 molecular sieve as a silica source

WANG Pengfei a,b, LI Junfen a, DONG Mei a, QIN Zhangfeng a, WANG Jianguo a, FAN Weibin a,*   

  1. a State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, Shanxi, China; b University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2012-11-14 Revised:2012-12-10 Online:2013-01-23 Published:2013-01-23

PDF

527

被引次数

2

摘要： 主要研究了以哌啶为模板剂, 深度脱铁的Fe-YNU-1分子筛为硅源, 采用后合成法制备Al-YNU-1分子筛及其形成机理. 通过考察铝含量、水含量、晶化时间和酸处理条件对形成Al-YNU-1分子筛结构的影响规律, 发现Al-YNU-1分子筛骨架中的Al含量较以深度脱硼的B-MWW为硅源得到的样品提高了近一倍. 结果表明, Si源中存在大量晶格缺陷位、酸处理脱除Al-MWW层状前驱中大部分模板剂分子与大量骨架Al是形成Al-YNU-1分子筛的必要条件.

关键词: Al-YNU-1, 水热合成, 酸处理, 机理, Fe-YNU-1

Abstract: Al-YNU-1 molecular sieve was synthesized through the post-synthesis method from highly acid-treated Fe-YNU-1 in the presence of piperidine. The effects of silica sources, structure-directing agents, composition of raw materials, and crystallization conditions on the structure and Al content of Al-YNU-1 were investigated. Optimizing the Al and H2O amounts in the synthesis mixture, as well as the crystallization time and the acid treatment conditions applied to the as-synthesized lamellar precursors, produced a large increase in the content of Al in the Al-YNU-1 framework, to nearly double that of a sample prepared using deborated MWW as the silica source. To form Al-YNU-1, it is essential to remove most of the template molecules and framework Al species from the lamellar Al-MWW precursor by acid treatment, and to have a large number of defect sites within the Si source.

Key words: Al-YNU-1, Hydrothermal synthesis, Acid treatment, Formation mechanism, Fe-YNU-1