THE EFFECT OF GEL VOLUME IN AUTOCLAVE ON THE SYNTHESIS OF MORDENITE FROM RICE HUSK SILICA BY HYDROTHERMAL METHOD
Keywords:
Mordenite, hydrothermal synthesis, rice husk silica, reflux, precipitationAbstract
Two types of rice husk silica (RHS) were used in hydrothermal syntheses of mordenite in sodium form (NaMOR). Acid treated RHS was prepared by refluxing rice husk with hydrochloric acid followed by calcination. Precipitated rice husk ash (RHA) was prepared by dissolution of RHA in sodium hydroxide solution followed by precipitation. The synthesis gel volume was 30, 50, and 70% of that of a Teflon-lined stainless steel autoclave. The NaMOR products from both silica sources were analyzed by X-ray diffraction (XRD), X-ray fluorescence, N2 adsorption-desorption analysis, ammonia temperature programmed desorption, and scanning electron microscopy. All samples showed characteristic XRD peaks of the NaMOR. The properties of the products including the Si/Al ratio, surface area, acidity, and morphology were influenced by the gel volume in the autoclave and the silica sources.
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