Solid-state ion exchange in beta zeolites. I: Alkaline chlorides/NH4-β

✍ Scribed by Vesselina P. Mavrodinova

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 188 KB
• Volume: 24
• Category: Article
• ISSN: 1387-1811
• DOI: 10.1016/s1387-1811(98)00138-3

✦ Synopsis

Solid-state ion exchange between Na and Cs chloride and two NH 4 -b zeolites with different SiO 2 /Al 2 O 3 ratios proceeding during heat treatment in He has been studied. Temperature-programmed gas evolution monitored by mass spectrometry ( TPE/MS ) and thermogravimetric analysis combined with 1-propylamine adsorption (DTG/1-PA) reveals differences in the rate of the reaction and the degree of exchange depending on the host zeolite and the guest salt used. The interaction is controlled not only by the temperature and the ability of the salt to disaggregate, but also by the type of exchangeable sites formed during the post-synthesis treatments.