Synthesis of aluminosilicates under high pressure and using sulfur as directing agent

Sandra Loera 1 , Enrique Lima 2 , Heriberto Pfeiffer 2 , and Victor Lara 3
  • 1 Metropolitan Autonomous University-Azcapotzalco
  • 2 National Autonomous University of Mexico
  • 3 Metropolitan Autonomous University-Iztapalapa

Abstract

Two aluminosilicates were prepared under hydrothermal conditions. Silica, sodium aluminate, sodium sulfide and sulfur were used as raw materials. Starting with similar reacting mixtures, analcime (zeolite, Na(Si2Al)O6·H2O) and beidellite (clay, Na0.3Al2(Si, Al)4O10(OH)2·2H2O) were synthesized by varying pressures, 2 kbar and 1 kbar, respectively. Sulfur was present in both aluminosilicate surfaces, which confer to them particular adsorption properties. Additionally, water adsorption isotherms, under dynamical conditions, were obtained. Fractal dimension values and SEM micrographs reveal very different textural and morphological properties of the two prepared aluminosilicates

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