Effects of silica sources on the morphology and acid properties of SAPO-34 molecular sieves
Abstract
Silicon-substituted aluminophosphates SAPO-34 molecular sieve has been synthesized under hydrothermal condition by using triethylamine, tetraethylammonium hydroxide, and morpholine as organic structure-directing agents, with different silica sources, such as TEOS and colloidal silica. The extent and effects of silicon substitution on these materials have been investigated by X-ray diffraction, field emission scanning electron microscopy and energy-dispersive X-ray analysis. Their acidity has been measured quantitatively by temperature-programmed desorption of ammonia. Using TEOS as silica source may result in smaller particles, but a lower level of silicon substitution for aluminium and phosphorus compared to colloidal silica.
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