Direct Synthesis of Nanoscale SAPO-11 Without Crystal Growth Modifiers: Application in Industrial Diesel Fraction Isodewaxing
Full article
| Journal |
Fuel
ISSN: 0016-2361
, E-ISSN: 1873-7153
|
| Output data |
Year: 2026,
Volume: 407,
Number: Part A,
Article number
: 137304,
Pages count
: 21
DOI:
10.1016/j.fuel.2025.137304
|
| Tags |
SAPO-11, hydroisomerization, isodewaxing of diesel fuel, nanocrystals, micro-mesoporous structure, arctic fuel |
| Authors |
Agliullin Marat R.
1
,
Serebrennikov Dmitry V.
1
,
Gerasimov Evgeny Yu.
2
,
Fedorov Alexey Yu.
3
,
Filippova Nadezhda A.
1
,
Zabirov Arthur R.
1
,
Malunov Arthur I.
1
,
Chemes Anastasia A.
4
,
Volik Andrey V.
4
,
Yakovenko Roman E.
4
|
| Affiliations |
| 1 |
Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre of the Russian Academy of Sciences (UFRC RAS), 450075 Ufa, Russia
|
| 2 |
Federal Research Center Boreskov Institute of Catalysis (BIC SB RAS), 630090 Novosibirsk, Russia
|
| 3 |
Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis, Nikolsky Prosp., 1, Kol’tsovo, 630559, Russia
|
| 4 |
Platov South-Russian State Polytechnic University (NPI), Prosveschenya 132, 346428 Novocherkassk, Russia
|
|
Funding (1)
|
1
|
Ministry of Science and Higher Education of the Russian Federation
|
FMRS-2024-0012 (124110200003-2)(075-00570-24-01)
|
The effectiveness of bifunctional SAPO-11-based catalysts in the isodewaxing process − a key technology for improving the low-temperature properties of diesel fuels − is critically limited by diffusion constraints in conventional microcrystals. This results in reduced selectivity and stability due to side reactions such as hydrocracking and coke formation. In this work, we present a novel hydrothermal synthesis method for producing nanosized SAPO-11 (~80–100 nm) in the absence of crystal growth modifiers or surfactants, based on controlling the particle size of SiO2 sol and the concentration of the reaction gel. A combination of physicochemical characterization techniques (XRD, XRF, SEM, HRTEM, TEM-SAED, 29Si MAS NMR and XPS) revealed that the use of SiO2 nanoparticles (~3 nm) promotes a higher nucleation rate and more uniform incorporation of silicon into the framework. This leads to the formation of nanocrystals with a hierarchical micro-mesoporous structure (SBET =
277 m2/g, SEX = 66 m2/g, Vmicro = 0.08 cm3/g, Vmeso = 0.22 cm3/g) and an increased concentration of accessible Brønsted acid sites. The Pt catalyst supported on nanosized SAPO-11 exhibited superior performance not only in the model hydroisomerization reaction of n-hexadecane, but, more importantly, in the isodewaxing of a real industrial diesel fraction. A high yield (>98 %) of isomerized diesel components was obtained, producing arcticgrade (CP = − 42 ◦C, CFPP = − 50 ◦C, PP = − 61 ◦C) with minimal hydrocracking and maintenance of the cetane number. This work presents not only a practically relevant strategy for designing highly efficient catalysts but also makes a significant contribution to the fundamental understanding of the role of the SiO2 source in the rational design of SAPO-n molecular sieves.