SYNTHESIS OF ZEOLITE BETA DIRECTLY FROM RICE HUSK ASH: EFFECT OF REACTION COMPOSITION ON CRYSTALLINITY OF ZEOLITE BETA
ABSTRACT: 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
-crystobalite, was used directly as a source
of silica in the synthesis of zeolite beta. The mole oxide ratio of the initial
gel of 1.25-8Na 2 O: 10-120SiO 2 : Al 2 O 3 : 1-20TEA 2 O: 150-1000H 2 O 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.: 1.25-4Na 2 O :
15-45SiO 2 : Al 2 O 3 : 4-10TEA 2 O : 240-480H 2 O. The other ratio of reaction
mixtures produced crystalline phases such as analcime, Na-P, mordenite, and
gismondine, and non-reacted of -crystobalite and
tridymite.
Author: Didik Prasetyoko,
Zainab Ramli, Salasiah Endud , Halimaton Hamdan b and Bogdan Sulikowski
Journal Code: jpkimiagg060009
