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Structure sensitivity of methanol decomposition on Ni/SiO2 catalysts

Authors
  • Mihaylov, Mihail1
  • Tsoncheva, Tanya2
  • Hadjiivanov, Konstantin1
  • 1 Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Sofia, 1113, Bulgaria , Sofia (Bulgaria)
  • 2 Institute of Organic Chemistry with a Centre of Phytochemistry, Bulgarian Academy of Sciences, Sofia, 1113, Bulgaria , Sofia (Bulgaria)
Type
Published Article
Journal
Journal of Materials Science
Publisher
Springer-Verlag
Publication Date
Nov 01, 2011
Volume
46
Issue
22
Pages
7144–7151
Identifiers
DOI: 10.1007/s10853-011-5437-4
Source
Springer Nature
Keywords
License
Yellow

Abstract

Three different silica-supported nickel samples were prepared by successive adsorption, reduction, and passivation (SARP) of nickel. The materials obtained were characterized by various techniques (TEM, XRD, H2 chemisorption, FTIR spectroscopy of adsorbed CO, FMR). Metal nickel particles were uniformly distributed by size with all samples. With increasing the number SARP cycles (1, 3, and 5, respectively) the metal concentration (3.6, 7.6, and 12.6 wt%, respectively) and the mean particle size (4–5, ca. 6 and ca. 7 nm, respectively) also increased without substantial increase of the number of metal particles. The samples were tested as catalysts in methanol decomposition to CO and H2. It was found that this reaction was structure sensitive and the turn-over frequency decreased with the particle size increase. In contrast, the secondary interaction between the reaction products, i.e., CO methanation (occurring above 515 K) appears to be structure insensitive.

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