CRYSTALLIZATION OF THE SILICOALUMOPHOSPHATE MOLECULAR SIEVE SAPO-5 FROM REACTION GELS WITH DIFFERENT SiO2/Al2O3 RATIOS AND ITS APPLICATION IN HYDROISOMERIZATION OF n-HEXADECANE

Мұқаба

Дәйексөз келтіру

Толық мәтін

Аннотация

Microporous silicoaluminophosphate molecular sieves SAPO-5 are considered promising acidic catalysts for hydrocarbon conversion processes. However, their catalytic performance is hindered by diffusion limitations, which can be mitigated by reducing crystal size and fine-tuning the acidic properties. The effect of the initial SiO2/Al2O3 ratio in the synthesis gel on the structural and acidic features of SAPO-5 was investigated using XPS, XRD, SEM, N2 adsorption–desorption, NH3-TPD, and IR spectroscopy. An increase in silicon content was found to decrease crystal size and enhance the external surface area. The concentration of Brønsted acid sites reaches a maximum, suggesting limited Si incorporation into the framework. In the hydroisomerization of n-hexadecane, the highest catalytic activity and selectivity towards isoparaffins were observed for the SAPO-5 sample with the smallest crystals and the highest acidity. These findings demonstrate that the structural and acidic properties of SAPO-5 can be effectively controlled through adjustment of the synthesis gel composition.

Авторлар туралы

D. Serebrennikov

Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre of the Russian Academy of Sciences

Email: d25c25@yandex.ru
450054 Ufa, Russian Federation

N. Filippova

Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre of the Russian Academy of Sciences

450054 Ufa, Russian Federation

A. Malunov

Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre of the Russian Academy of Sciences

450054 Ufa, Russian Federation

R. Kuvatova

Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre of the Russian Academy of Sciences

450054 Ufa, Russian Federation

O. Travkina

Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre of the Russian Academy of Sciences

450054 Ufa, Russian Federation

B. Kutepov

Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre of the Russian Academy of Sciences

450054 Ufa, Russian Federation

M. Agliullin

Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre of the Russian Academy of Sciences

450054 Ufa, Russian Federation

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