Ultrasonically controlled deposition-precipitation Co-Mo HDS catalysts deposited on wide-pore MCM material

M. V. Landau, L. Vradman, M. Herskowitz, Y. Koltypin, A. Gedanken

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9 Scopus citations


Mo and Co oxides were precipitated under ultrasonication treatment from Mo(CO)6 and Co(CO)3NO dissolved in decalin. Introduction of wide-pore Al-MCM-41 material with an average pore diameter 8.3 nm and a surface area of 840 m2/g increased the Mo oxide precipitation rate by an order of magnitude. This is a result of an ultrasonically induced chemical interaction between metal carbonyl (oxide) and the surface silica atomic layer yielding surface silicates (XPS, MAS NMR). It was demonstrated for the first time that ultrasonication of such a slurry yields deposition-precipitation of the corresponding metal oxide, forming a close-packed monolayer at the support’s surface (N2 adsorption, HR-TEM, XPS, XRD). Ultrasonically controlled deposition-precipitation produced ∼45 wt% MoO3 loading, which is saturation of the wide-pore Al-MCM-41 surface monolayer. The high-loading Co-Mo/Al-MCM-41 catalyst prepared by ultrasonically controlled deposition-precipitation was 1.7 times more active in HDS of dibenzothiophene, based on the reaction rate normalized per catalyst weight, than commercial Co-Mo-Al catalyst.

Original languageEnglish
Pages (from-to)22-36
Number of pages15
JournalJournal of Catalysis
Issue number1
StatePublished - 2001

Bibliographical note

Funding Information:
We acknowledge the financial support of the Israeli Ministry of Science. This research was supported in part by the Israel Science Foundation founded by the Israel Academy of Science & Humanities. We also thank Prof. S. Vega and Dr. S. Kababya for conducting the MAS NMR measurements and for useful discussions.


  • Catalyst preparation by ultrasonication
  • Co-Mo on MCM-41
  • Deposition-precipitation
  • HDS
  • Mo oxide monolayer


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