Preparation of an A-type zeolite film on the surface of an alumina ceramic filter

✍ Scribed by Takao Masuda; Hiroshisa Hara; Mitsuhiro Kouno; Hiroshi Kinoshita; Kenji Hashimoto

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 507 KB
• Volume: 3
• Category: Article
• ISSN: 0927-6513
• DOI: 10.1016/0927-6513(94)00071-3

✦ Synopsis

An A-type zeolite film was prepared on the outer surface of an alumina ceramic filter by repeated hydrothermal syntheses using the same sample (referred to as repeated batch synthesis). The thickness of the film was found to increase to 35 gm by precipitating the crushed zeolite crystal on the ceramic filter and to 50 gm by precipilating the crushed alumina before repeated batch synthesis. The structure and atomic composition of the zeolite film obtained were found to be the same as those of the corresponding original zeolite using several spectrometric methods: X-ray diffraction (XRD), 298i magic-angle spinning nuclear magnetic resonance (MAS NMR) and electron-probe m!croanalysis (EPMA). The morphology and thickness of the zeolite film were dependent on the reaction time and temperature, and especially on the types of silica and alumina sources. The preferred silica and alumina sources were Na~SiO3 and AI(OH )3, respectively; these are different from the usual sources for the synthesis of powdery A-type zeolites.