Effect of selective removal of aluminium from external surfaces of HZSM-5 zeolite on shape selectivity

✍ Scribed by S. Namba; A. Inaka; T. Yashima

• Book ID: 104290429
• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 390 KB
• Volume: 6
• Category: Article
• ISSN: 0144-2449
• DOI: 10.1016/s0144-2449(86)80006-9

✦ Synopsis

Tokyo

By treating NaZSM-5 zeolite with SiCl4 vapour at 723-923 K, the ZSM-5 zeolite was dealuminated. The aluminium atoms on the external surface of ZSM-5 crystallites were removed more selectively than those in the pores. More selective dealumination took place at the higher temperatures.

The selectively dealuminated HZSM-5 zeolites exhibit a higher shape selectivity for the alkylation of 1,2,4-trimethyl benzene with methanol than the parent HZSM-5. The selective dealumination reduces the aging rate for the cracking of cumene.