Didik Prasetyoko(1*), Zainab Ramli(2), Salasiah Endud(3), Halimaton Hamdan(4), Bogdan Sulikowski(5)

(1) Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 Johor
(2) Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 Johor
(3) Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 Johor
(4) Ibnu Sina Insitute for Fundamental Science Studies, Universiti Teknologi Malaysia, 81310 Johor
(5) Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Cracow
(*) Corresponding Author


White rice husk ash obtained from complete uncontrolled burning of rice husk contains more than 94% silica. The ash, which consists of crystalline silica of the type tridymite and α-crystobalite, was used directly as a source of silica in the synthesis of zeolite beta. The mole oxide ratio of the initial gel of 1.25-8Na2O: 10-120SiO2: Al2O3: 1-20TEA2O: 150-1000H2O was prepared and heated at 150°C in a static condition for 6 d. The solid phases formed were monitored by XRD technique. Influence of reaction mixture ratio in the initial gel to the crystalline products formed was studied. Results showed that the pure zeolite beta was formed in a certain range of reaction mixture, i.e.: 1.25-4Na2O : 15-45SiO2 : Al2O3 : 4-10TEA2O : 240-480H2O. The other ratio of reaction mixtures produced crystalline phases such as analcime, Na-P, mordenite, and gismondine, and non-reacted of α-crystobalite and tridymite.


rice husk ash; tridymite; α-crystobalite; zeolite beta; synthesis

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