NDLI: Preparation of zeolite-coated cordierite honeycombs prepared by an in situ crystallization method

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Preparation of zeolite-coated cordierite honeycombs prepared by an in situ crystallization method

Content Provider	Taylor & Francis Online
Author	Madhusoodana, Chengala D. Kameshima, Yoshikazu Das, Rathindra N. Okada, Kiyoshi
Abstract	Zeolite thin films were prepared on cordierite (Mg2Al4Si5O18) honeycomb substrates by in situ crystallization using soft hydrothermal conditions. The synthesized zeolite films (zeolite A and ZSM-5) were characterized by XRD, FTIR, SEM, NH3-TPD, and Ns2 and propane gas adsorption. Zeolite-A films were prepared by dip-coating on a cordierite substrate in a precursor of molar composition of Na2O:Al2O3: SiO2: H2O = 4:1:2:100 and heating in an autoclave at 80 °C for 6–10 h. The resultant zeolite-A films consisted of cubic crystals about 2–3 μm in size, achieving a thickness of 20 μm after re-coating. ZSM-5 films were similarly formed using a microporous silica precursor obtained by selective leaching of metakaolinite with tetrapropylammonium hydroxide (TPAOH) as the templating agent. The molar composition of the precursor was NaOH:microporous silica:TPAOH:H2O = 1:10:1:200. The dipped substrate covered with the wet precursor gel was heated in an autoclave at 150 °C for 24 h. The resultant films were composed of short prismatic <1 μm crystals achieving thickness of several to 10 μm after re-coating. The microstructure and porous properties of the ZSM-5 films were found to change according to the chemical composition and surface treatment of the cordierite substrates. The presence of a SiO2-rich interfacial layer between the substrate and zeolite film increased the amount of zeolite formed and the physical adsorption but decreased the solid acidity and amount of chemisorption.
Starting Page	479
Ending Page	484
Page Count	6
File Format	PDF HTM / HTML
ISSN	14686996 18785514
DOI	10.1016/j.stam.2004.03.001
Journal	Science and Technology of Advanced Materials
Volume Number	5
Issue Number	4
Language	English
Publisher	Taylor & Francis
Publisher Date	2004-04-12
Access Restriction	Open
Subject Keyword	Zeolite films In situ crystallization Porous properties Microstructure Hydrothermal treatment
Content Type	Text
Resource Type	Article
Subject	Materials Science

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