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High-loaded nickel–silica catalysts for hydrogenation, prepared by sol–gel Route: structure and catalytic behavior Full article

Общее Language: Английский, Genre: Full article,
Status: Published, Source type: Original
Journal Applied Catalysis A: General
ISSN: 0926-860X , E-ISSN: 1873-3875
Output data Year: 2003, Volume: 245, Number: 2, Pages: 277-288 Pages count : 12 DOI: 10.1016/S0926-860X(02)00648-8
Tags Benzene hydrogenation, Ethyl silicate-32, Heterophase sol-gel synthesis, High-loaded, Hydrated NiO, Nickel-silica catalysts
Authors Ermakova Marina A. 1 , Ermakov Dmitry Yu. 1
Affiliations
1 Boreskov Institute of Catalysis, Prosp. Ak. Lavrentieva 5, Novosibirsk 630090, Russia

Abstract: Ni/SiO2 catalysts (from 50 to 95 wt.% of nickel) were prepared by the heterophase sol–gel method through impregnation of dispersed hydrated nickel oxide with commercial ethyl silicate-32. Impregnation of a porous metal precursor with alcoholic solution of the ethyl silicate followed by drying makes it condensed to form polysiloxane films directly on the precursor surface. The next steps of calcination and reduction lead to formation of a silica matrix with metal nanoparticles confined in its pores. 29Si NMR, IR spectroscopy, differentiating dissolution, temperature-programmed reaction (TPR), X-ray powder diffraction (XRD) and transmission electron microscope (TEM) techniques were used for studies of the precursors and catalysts. It was shown that silicate species favoring formation of fine nickel particles under reduction were produced by interaction of hydrated NiO with ethyl silicate. As the silica content increased from 5 to 52%, the nickel particles decreased in size from 10 to 4 nm. The sol–gel catalysts were tested in the reaction of benzene hydrogenation to show that the nickel surface was not blocked by silica but exposed to reactants. As a result, the observed catalytic activity was higher than the activity of a number of commercial nickel catalysts.
Cite: Ermakova M.A. , Ermakov D.Y.
High-loaded nickel–silica catalysts for hydrogenation, prepared by sol–gel Route: structure and catalytic behavior
Applied Catalysis A: General. 2003. V.245. N2. P.277-288. DOI: 10.1016/S0926-860X(02)00648-8 publication_identifier_short.wos_identifier_type publication_identifier_short.scopus_identifier_type publication_identifier_short.rinz_identifier_type
Dates:
Submitted: Sep 20, 2002
Accepted: Dec 4, 2002
Published online: Jan 31, 2003
Published print: Jun 10, 2003
Identifiers:
publication_identifier.wos_identifier_type WOS:000183414400006
publication_identifier.scopus_identifier_type 2-s2.0-0038188617
publication_identifier.rinz_identifier_type 13438462
publication_identifier.accession_number_identifier_type 2003:407454
publication_identifier.chemical_accession_number_identifier_type 139:12933
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