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Journal of Materials Science

, Volume 46, Issue 22, pp 7144–7151 | Cite as

Structure sensitivity of methanol decomposition on Ni/SiO2 catalysts

  • Mihail MihaylovEmail author
  • Tanya Tsoncheva
  • Konstantin Hadjiivanov
Size Dependent Effects

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.

Keywords

Metal Particle Passivated Sample Nickel Particle Structure Sensitivity Metal Particle Size 

Notes

Acknowledgments

This study was supported by the Bulgarian Scientific Fund (Grants 02-290/2008 and DCVP 02/2009). The authors thank Dr. M. Shopska for her assistance with the H2 chemisorption measurements.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Mihail Mihaylov
    • 1
    Email author
  • Tanya Tsoncheva
    • 2
  • Konstantin Hadjiivanov
    • 1
  1. 1.Institute of General and Inorganic Chemistry, Bulgarian Academy of SciencesSofiaBulgaria
  2. 2.Institute of Organic Chemistry with a Centre of Phytochemistry, Bulgarian Academy of SciencesSofiaBulgaria

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