SILICON SPECIES IN A SAPO-5 MOLECULAR-SIEVE

[[abstract]]The incorporation of silicon into a AlPO4-5 molecular sieve modifies the acidity of the host without disrupting its microporous structure. The amount of silicon substitution in AlPO4-5 was found to be dependent on the silicon source and the template used in the synthesis condition. The silicon substitution of phosphorous was studied by Si-29 magic angle spinning-nuclear magnetic resonance and electron probe microanalysis. The strength and concentration of the Bronsted acidity of SAPO-5 were also studied by the temperature-programmed desorption of ammonia and IR spectroscopy.[[fileno]]2010323010038[[department]]化學