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RAS PresidiumДоклады Российской академии наук. Химия, науки о материалах Doklady Chemistry

  • ISSN (Print) 2686-9535
  • ISSN (Online) 3034-5111

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

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PII
S3034511125040031-1
DOI
10.7868/S3034511125040031
Publication type
Article
Status
Published
Authors
D. V. Serebrennikov
  • Affiliation: Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre of the Russian Academy of Sciences
N. A. Filippova
  • Affiliation: Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre of the Russian Academy of Sciences
A. I. Malunov
  • Affiliation: Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre of the Russian Academy of Sciences
R. Z. Kuvatova
  • Affiliation: Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre of the Russian Academy of Sciences
O. S. Travkina
  • Affiliation: Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre of the Russian Academy of Sciences
B. I. Kutepov
  • Affiliation: Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre of the Russian Academy of Sciences
M. R. Agliullin
  • Affiliation: Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre of the Russian Academy of Sciences
Volume/ Edition
Volume 523 / Issue number 1
Pages
18-28
Abstract
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 SiO/AlO ratio in the synthesis gel on the structural and acidic features of SAPO-5 was investigated using XPS, XRD, SEM, N adsorption—desorption, NH-TPD, and IR spectroscopy. An increase in silicon content was found to decrease crystal size and enhance the external surface area. The concentration of Bronsted acid sites reaches a maximum, suggesting limited Si incorporation into the framework. In the hydroisomerization of -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.
Keywords
молекулярные сита силикоалломофосфат SAPO-5 высокодисперсные кристаллы Pt-катализаторы гидроизомеризация -парафинов
Date of publication
01.08.2025
Year of publication
2025
Number of purchasers
0
Views
31

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