Indexed by:期刊论文

Date of Publication:2014-03-01

Journal:JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY

Included Journals:SCIE、EI、Scopus

Volume:89

Issue:3

Page Number:419-424

ISSN No.:0268-2575

Key Words:crystallization; synthesis; characterization; zeolites

Abstract:BACKGROUNDZeolite omega is used as a catalyst in various fields. Expensive tetramethylammonium cations are the conventional structure-directing agents for the synthesis of zeolite omega. In this work, glycerol was used as both solvent and structure-directing agent instead of expensive quaternary ammonium compounds. Zeolite omega has been obtained through conversion of magadiite in this glycerol-water system. The effects of various parameters such as reaction time, temperature, alkalinity and glycerol content were discussed.
   RESULTSPure zeolite omega could be obtained at 120 degrees C for 10 days with the reactants molar composition of 14 SiO2: Al2O3: 10 Na2O: 169 H2O: 200 glycerol. Water content plays an important role in the solvothermal conversion of magadiite to zeolite omega.
   CONCLUSIONThe zeolite omega obtained from this system is a rather pure phase free from impurities. A preferential location of the Al atoms in the six-membered rings of the gmelinites in zeolite omega was observed. A method including extraction and calcination was introduced to remove organic species by which highly ordered pore structure of zeolite was well retained. The present work develops a novel synthesis method for zeolite omega. (c) 2013 Society of Chemical Industry