Physicochemical and Catalytic Properties of Granular Mordenites of High Crystallinity Degree with a Hierarchical Porous Structure: Influence of Post-synthetic Treatment
O. S. Travkina *
Institute of Petrochemistry and Catalysis of Russian Academy of Sciences, 141 Pr. Oktyabrya, Ufa 450075, Russian Federation and Department of Oil and Gas Technology, Ufa State Petroleum Technological University, 1 Cosmonavtov Street, Ufa 450062, Russian Federation
A. N. Khazipova
Institute of Petrochemistry and Catalysis of Russian Academy of Sciences, 141 Pr. Oktyabrya, Ufa 450075, Russian Federation
I. N. Pavlova
Institute of Petrochemistry and Catalysis of Russian Academy of Sciences, 141 Pr. Oktyabrya, Ufa 450075, Russian Federation
A. F. Akhmetov
Department of Oil and Gas Technology, Ufa State Petroleum Technological University, 1 Cosmonavtov Street, Ufa 450062, Russian Federation
B. I. Kutepov
Institute of Petrochemistry and Catalysis of Russian Academy of Sciences, 141 Pr. Oktyabrya, Ufa 450075, Russian Federation and Department of Oil and Gas Technology, Ufa State Petroleum Technological University, 1 Cosmonavtov Street, Ufa 450062, Russian Federation
L. S. Galyautdinova
Department of Oil and Gas Technology, Ufa State Petroleum Technological University, 1 Cosmonavtov Street, Ufa 450062, Russian Federation
*Author to whom correspondence should be addressed.
Abstract
The purpose of this research was to study the influence of post-synthetic treatment of a granular mordenite of a high degree of crystallinity with a hierarchical porous structure in water vapour medium and aqueous solutions of citric acid. The conditions providing the increase of the modulus from 4.5 to 8.5 with a constant degree of crystallinity were specified. It was found that the volume of mesopores in the zeolite increases from 0.20 - 0.23 cm3/g indicating the decrease of micropore volume. The results showed that dealuminated granular H-form mordenites of a high degree of crystallinity with a hierarchical porous structure after the promotion of 0.3 wt% platinum exhibited high activity and selectivity in the hydroisomerisation of a model mixture of benzene-heptane into methylcyclopentane and n-heptane isomers.
Keywords: Zeolites mordenite, micro-mesoporous materials, post-synthetic treatment, hydro-isomerization