Abstract
Two series of microporous silicoaluminophosphates SAPO-31 with different Si content (Si/Al = 0—0.5) were synthesized using silica sources characterized by various degree of polymerization (fumed silica and tetraethoxysilane). Physicochemical properties of the resulted materials were studied by X-ray diffraction, XPS, scanning (SEM) and transmission (TEM) electron microscopy. The nature of the silicon species was identified by 29Si NMR method and the acidity was measured by IR-spectroscopy of adsorbed pyridine. The activity and selectivity of Pd modified SAPO-31 samples from both series were evaluated in the isomerization of n-decane. It was found that the use of the monomer as a silicon source ensured more efficient silicon incorporation, which resulted in the higher activity of Pd/SAPO-31 catalysts. Moreover, the selectivity of these samples for isomerization was found to be independent of the silicon content and its distribution.
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Research Institute of Inorganic Chemistry, RENTECH-Uni-CRE, Czech Republic, 436 70 Litvinov, Chempark Litvinov, Zaluzi.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 0231—0240, February, 2017.
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Smirnova, M.Y., Davydova, M.G., Titkov, A.I. et al. Physicochemical and catalytic properties of SAPO-31 materials prepared from the silica sources characterized by a different degree of polymerization. Russ Chem Bull 66, 231–240 (2017). https://doi.org/10.1007/s11172-017-1723-x
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DOI: https://doi.org/10.1007/s11172-017-1723-x