Role of heteroatoms in precursor formation of zeolites

摘要：

The structures of amorphous precursors formed prior to the onset of crystallization of microporous aluminosilicates (mordenite) and zincosilicates (VPI-7) are determined employing high-energy X-ray diffraction (HEXRD) technique. Without heteroatoms, silicate ring size is distributed around 6 ring (6R). Aluminum incorporation promotes the formation of smaller rings (especially 4R), while zinc incorporation promotes the formation of 3R before their crystallizations. The ring statistics for the crystalline zeolites are formed in the corresponding amorphous precursors.

作者: Toru Wakihara Wei Fan Yasuhiro Suzuki Masaru Ogura Shinji Kohara Gopinathan Sankar Tatsuya Okubo

作者单位: Department of Chemical System Engineering, The University of Tokyo, Tokyo 113-8656,Japan Japan Synchrotron Radiation Research Institute and CREST-JST, Hyogo 679-5198, Japan Davy Faraday Research Laboratory, Royal Institution of Great Britain, London W1S 4BS,U.K

会议类型: 国际会议

会议名称: 第15届国际分子筛大会

会议地点: 北京

会议语种:英文

在线出版日期: 2007-08-12（万方平台首次上网日期，不代表论文的发表时间）