Effect of the Si/Al ratio on the structure and surface properties of silica-alumina-pillared clays |
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| Affiliation: | 1. Departamento de Química Aplicada, Edificio Los Acebos, Universidad Pública de Navarra, Campus de Arrosadía, s/n, E-31006 Pamplona, Spain;2. Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad de Salamanca, Plaza de la Merced, s/n, E-37008 Salamanca, Spain;1. Unit Sustainable Materials Management, Flemish Institute for Technological Research (VITO), Boeretang 200, 2400 Mol, Belgium;2. Materials and Chemistry, SINTEF, PB 124 Blindern, N-0314 Oslo, Norway;1. Johnson Matthey, PO Box 1, Belasis Avenue, Billingham, Cleveland, TS23 1LB, UK;2. TNO, Westerduinweg 3, NL 1755 LE, Petten, the Netherlands;3. Swerim AB, Aronstorpsvägen 1, 974 37, Luleå, Sweden;4. Johnson Matthey, Blounts Court Road, Sonning Common, Reading, RG4 9NH, UK;1. Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin, 300072, China;2. Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, China |
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| Abstract: | In the present work, the synthesis of silica-alumina-pillared montmorillonites and their structure are studied. Hydroxy-silico-aluminum oligocations have been obtained by treating previously synthesised aluminum polycations with Si(OC2H5)4. Several Si/Al ratios (0, 0.5, 1, and 2) have been used to prepare pillared clays with various microporous accessibility and acidic properties. The study of the fractal dimensions of the solids shows that their surface becomes more heterogeneous after pillaring. The acidity of alumina- and silica-alumina-pillared montmorillonites is mainly of the Lewis type, and the nature of the acid sites detected by pyridine adsorption seems to be independent of the Si/Al ratio. These results are supported by the product distribution obtained in the 1-butanol dehydration reaction. |
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