Synthesis of zeolite omega. Influence of the temperature and the reagents on the crystallization kinetics |
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| Affiliation: | 1. Institut Charles Gerhardt (ICG), UMR-5253, CNRS, UM, ENSCM, Ingénierie et Architectures Macromoléculaires (IAM), Matériaux Avancés pour la Catalyse et la Santé (MACS), Ecole Nationale Supérieure de Chimie, 8 rue de l’Ecole Normale, 34296 Montpellier Cedex 5, France;2. Institut Européen des Membranes, UMR-5635, CNRS, ENSCM, UM, CC047, Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France;3. Institut de Chimie Séparative de Marcoule (ICSM), UMR-5257, CEA, CNRS, UM, ENSCM, Centre de Marcoule, BP 17171, 30207 Bagnols sur Cèze Cedex, France;4. Department of Chemical Engineering, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa;5. Quantum Nanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands;6. Università di Messina, ERIC aisbl and CASPE/INSTM, Sect. Industrial Chemistry, V.le F. Stagno D''Alcontres 31, 98166 Messina, Italy;1. School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, PR China;2. Department of Ecosystem Science and Management and Materials Research Institute, 204 Energy and the Environment Laboratory, The Pennsylvania State University, University Park, PA, 16802, USA;1. KU Leuven, Center for Surface Chemistry and Catalysis, Department of Microbial and Molecular Systems (M2S), Celestijnenlaan 200F, Box 2461, 3001, Leuven, Belgium;2. Centre for Nanoporous Materials, School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK;3. Institut Lavoisier de Versailles, UVSQ, University of Paris-Saclay, 45 Avenue des Etats-Unis, 78035, Versailles Cedex, France;1. Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX, 77204, USA;2. Department of Mechanical Engineering Technology, University of Houston, Houston, TX, 77204, USA |
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| Abstract: | The kinetics of the crystallization of zeolite omega in the system Na2O, TMA2O, Al2O3, SiO2, H2O have been determined as a function of the temperature and the nature of the sources of silicon and aluminium. At 100°C, faujasite appears first and is then dissolved while crystals of zeolite omega develop. Sodalite is also formed but pure zeolite omega can be isolated after 15 days. At 135°C the transient formation of faujasite is not observed. The crystallization kinetics of zeolite omega are not sensitive to the nature of the reagents but those of the secondary products (sodalite, analcite, mordenite, cristobalite) depend on their reactivity. Porous silica gel favours the nucleation of sodalite. Reaction mixtures prepared from kaolinite lead to die-shaped monocrystals which are stable in the medium whereas sodium aluminate produces polycrystalline aggregates which are progressively dissolved. Under these conditions pure zeolite omega was obtained after only one day of reaction using sodium aluminate and a non-porous silica gel as starting materials. |
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