Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2013-08-01

Journal: MICROPOROUS AND MESOPOROUS MATERIALS

Included Journals: EI、SCIE

Volume: 176

Page Number: 155-161

ISSN: 1387-1811

Key Words: Magadiite; Mordenite; Conversion; Cyclohexylamine

Abstract: Hydrothermal conversion of magadiite, in the presence of cyclohexylamine (CHA), into a commercially important mordenite (MOR zeolite) has been investigated. The effects of various parameters such as the reactant H2O/SiO2 ratio, CHA/SiO2 ratio, reaction time, the presence of sodium ions and potassium ions are studied. Thermal and acid stability of the as-made MOR zeolite were examined. The pure MOR zeolite with high crystallinity, which is composed of parallelepiped crystals agglomerate, was obtained at 140 degrees C for 28 h with the molar composition: 0.14M(2)O:SiO2:xAl(2)O(3):54H(2)O:16CHA (M2O = K2O + Na2O, K/K + Na = 0.3, x = 0.028 and 0.04). The structure of the sample was totally destroyed at 1100 degrees C and the product is exceptionally stable towards strong acid. (c) 2013 Elsevier Inc. All rights reserved.