The Synthesis and Properties of an OFF-type Zeolite
K. K. Gorshunova
Institute of Petroleum Chemistry and Catalysis of the Russian Academy of Sciences, 141 October Avenue, Ufa, Russia.
O. S. Travkina *
Institute of Petroleum Chemistry and Catalysis of the Russian Academy of Sciences, 141 October Avenue, Ufa, Russia.
M. L. Pavlov
Institute of Petroleum Chemistry and Catalysis of the Russian Academy of Sciences, 141 October Avenue, Ufa, Russia.
B. I. Kutepov
Institute of Petroleum Chemistry and Catalysis of the Russian Academy of Sciences, 141 October Avenue, Ufa, Russia.
L. M. Kustov
N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences, Russia.
*Author to whom correspondence should be addressed.
Abstract
The technique for synthesizing powdered OFF-type zeolite of high phase purity and crystallinity has been developed. The effect of crystallization conditions on the characteristics of powdered OFF-type zeolite samples, namely, crystallinity, particle-size distribution, and adsorption of molecules has been studied. An increase in the crystallization temperature has been found to reduce the synthesis duration time; however it resulted in the formation of larger OFF-type zeolite crystals and aggregates thereof. It has been discovered than the particle size of the obtained OFF-type zeolite samples does not affect the adsorption of H2O molecules. On the coarse-crystalline samples the slower diffusion rate of n-С6Ð14 molecules into the zeolite channels is observed; it is associated with the larger size of the adsorbed substance molecules. And for yet larger С6Ð12 molecules the equilibrium adsorption capacity values are decreased.
Keywords: OFF-type zeolite, crystallization, particle-size distribution, adsorption.