Mesoporous molecular sieve MCM-41 supported Co-Mo catalyst for hydrodesulfurization of petroleum resids

Kondam Madhusudan Reddy, Boli Wei, Chunshan Song

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Abstract

In this work, we explored the potential of mesoporous zeolite-supported Co-Mo catalyst for hydrodesulfurization of petroleum resids, atmospheric and vacuum resids at 350-450°C under 6.9 MPa of H2 pressure. A mesoporous molecular sieve of MCM-41 type was synthesized; which has SiC2/Al2O3 ratio of about 41. MCM-41 supported Co-Mo catalyst was prepared by co-impregnation of Co(NO3)2·6H2O and (NH4)6Mo7O24 followed by calcination and sulfidation. Commercial Al2O3 supported Co-Mo (criterion 344TL) and dispersed ammonium tetrathiomolybdate (ATTM) were also tested for comparison purposes. The results indicated that Co-Mo/MCM-41(H) is active for HDS, but is not as good as commercial Co-Mo/Al2O3 for desulfurization of petroleum resids. It appears that the pore size of the synthesized MCM-41 (28 Å) is not large enough to convert large-sized molecules such as asphaltene present in the petroleum resids. Removing asphaltene from the resid prior to HDS has been found to improve the catalytic activity of Co-Mo/MCM-41(H). The use of ATTM is not as effective as that of Co-Mo catalysts, but is better for conversions of >540°C fraction as compared to noncatalytic runs at 400-450°C.

Original languageEnglish (US)
Pages (from-to)261-272
Number of pages12
JournalCatalysis Today
Volume43
Issue number3-4
DOIs
StatePublished - Aug 27 1998

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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