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Vapor‐Phase Transport Crystallization of Micro‐ HZSM ‐5 Zeolite Coatings
Author(s) -
Liu Guozhu,
Zhang Likang,
You Zhiqiang,
Wang Li,
Zhang Xiangwen
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13099
Subject(s) - zeolite , crystallization , catalysis , chemical engineering , materials science , coating , fluid catalytic cracking , supercritical fluid , phase (matter) , amorphous solid , mordenite , cracking , composite material , chemistry , organic chemistry , engineering
A novel structured catalyst of binderless micro‐ HZSM ‐5 zeolite coating was prepared on stainless‐steeled tubes (i.d. 2 mm) through wash coating and vapor‐phase transport (VPT) crystallization method. The subsequent crystallization of amorphous SiO 2 binders improved the coatings adhesion tremendously by more than 10 times with the least amount of binders (<20% by weight), attributed to the remarkably enhanced interlock by the formed Mordenite Framework Inverted structure between zeolite particles. Catalytic cracking of supercritical n ‐dodecane (500°C, 4 MP a) was used to examine the catalytic performance of the coatings as prepared, indicating that MZC ‐V0.2 exhibited a catalytic activity improvement by 8% and a decreased deactivation rate by 48%. The improved catalytic performance may result from its high acid sites amount by incorporating extra‐framework Al into HZSM ‐5 framework, and the possible depressing of pore‐mouth deactivation through partial modification of surface acid sites during VPT treatment. This work provides a potential technique to prepare mechanically stable zeolite coatings with high catalytic activity but less binder usage.