Synthesis of MCM-41 with high content of framework aluminum using mixed templates

✍ Scribed by Ying Wan; Jianxin Ma; Zheng Wang; Wei Zhou

• Book ID: 104055161
• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 353 KB
• Volume: 76
• Category: Article
• ISSN: 1387-1811
• DOI: 10.1016/j.micromeso.2004.07.027

✦ Synopsis

High content structural aluminum incorporated MCM-41 molecular sieves were synthesized via a hydrothermal method using cetyltrimethylammonium bromide and cetyltrimethylammonium hydroxide as mixed templates. This method provides Al-MCM-41 of different Si/Al atom ratios from 3 to 100 corresponding to 0.91-30.3 mol% Al. Characterization using X-ray diffraction and nitrogen adsorption measurements revealed that Al-MCM-41 prepared by this method had a highly ordered structure of pore arrays. Solid state 27 Al MAS-NMR investigation showed further that the Al atoms were in tetrahedral coordination even at a high level of aluminum (30.3 mol% Al). In order to distinguish the new method, the samples prepared by the conventional hydrothermal method were also investigated and compared with the former.