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Formation of Mesopores in USY Zeolites: A Case Revisited
Author(s) -
Lutz Wolfgang,
Kurzhals Rolf,
Kryukova Galina,
Enke Dirk,
Weber Manfred,
Heidemann Detlef
Publication year - 2010
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201000025
Subject(s) - mesoporous material , crystallite , zeolite , crystallinity , aluminosilicate , amorphous solid , materials science , chemical engineering , catalysis , steaming , inorganic chemistry , mineralogy , chemistry , organic chemistry , metallurgy , composite material , engineering , food science
Abstract Steaming of NH 4 Y zeolite at 723 K and 873 K is accompanied by the formation of extra‐framework amorphous aluminosilicate and silica gel in addition to earlier observed extra‐framework aluminum species. Their occurrence is directly associated with the formation of mesopores. Bulk (intracrystalline) mesopores occur inside the crystallite nuclei and surface (intercrystalline) mesopores are located nearby the crystallite surface. Corrosion of the zeolite framework results in a loss of crystallinity and, consequently, decreased catalytic activity of the USY catalysts synthesized. Analysis of the reasons of mesopore formation may help to reduce these disadvantages.