Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2013-07-01

Journal: MICROPOROUS AND MESOPOROUS MATERIALS

Included Journals: EI、SCIE

Volume: 174

Page Number: 108-116

ISSN: 1387-1811

Key Words: SUZ-4 zeolite; Seed slurry; Controllable synthesis; Green synthesis

Abstract: The influence of chemical composition of initial gel on the crystallization kinetic, product yield, particularly, on the morphology and SiO2/Al2O3 ratio of zeolite was investigated for the SUZ-4 zeolite synthesis with the assistance of seed slurry. It was found that the SiO2/Al2O3 ratio and morphology of the SUZ-4 zeolite can be controlled by manipulating the H2O content, SiO2/Al2O3 ratio, and K+ content of the initial gel. The crystallization time for obtaining the 100% SUZ-4 zeolite was shortened to 12 h from 96 h at 150 C for the first time by reducing the H2O content in the gel. It was found that coexistence of Na+ with K+ in the gel does not influence the SUZ-4 zeolite synthesis, while only K+ can incorporate into the SUZ-4 framework. The SUZ-4 zeolite with the SiO2/Al2O3 ratio as high as 18.0 was obtained by decreasing K+ content and increasing SiO2/Al2O3 ratio of the gel with the assistance of seed slurry. Well-crystalline SUZ-4 was obtained in the synthesis recycling 100% mother liquid. As the mother liquid produced from each batch of synthesis was not changed in amount, a possible green process of SUZ-4 synthesis in industry was proposed. Crown Copyright (C) 2013 Published by Elsevier Inc. All rights reserved.