TY - JOUR

T1 - Physicochemical and catalytic properties of SAPO-31 materials prepared from the silica sources characterized by a different degree of polymerization

AU - Smirnova, M. Yu

AU - Davydova, M. G.

AU - Titkov, A. I.

AU - Ayupov, A. B.

AU - Kikhtyanin, O. V.

PY - 2017/2/1

Y1 - 2017/2/1

N2 - 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.

AB - 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.

KW - fumed silica

KW - isomerization

KW - mechanism of silicon incorporation

KW - microporous silicoaluminophosphates

KW - n-decane

KW - tetraethoxysilane

KW - CRYSTALLIZATION

KW - SILICOALUMINOPHOSPHATES

KW - ISOMERIZATION

KW - HYDROISOMERIZATION

KW - MOLECULAR-SIEVES

KW - N-OCTANE

KW - ACIDIC PROPERTIES

KW - 1-BUTENE

KW - SI

KW - PARAFFINS

UR - http://www.scopus.com/inward/record.url?scp=85021837398&partnerID=8YFLogxK

U2 - 10.1007/s11172-017-1723-x

DO - 10.1007/s11172-017-1723-x

M3 - Article

AN - SCOPUS:85021837398

VL - 66

SP - 231

EP - 240

JO - Russian Chemical Bulletin

JF - Russian Chemical Bulletin

SN - 1066-5285

IS - 2

ER -