Stability of MCM-41-supported CoMo hydrotreating catalysts

P. J. Kooyman, P. Waller, A. D. Van Langeveld, Chunshan Song, K. M. Reddy, J. A.R. Van Veen

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Abstract

The performance of sulfided CoMo hydrotreating catalysts supported on MCM-41 has been evaluated using hydrodesulfurization of 4-ethyl, 6-methyl-dibenzothiophene (4E,6M-DBT) model compound in n-hexadecane and of 4-methyl, 6-methyl-dibenzothiophene (4,6-DMDBT) in a commercial feed as a test reaction. Although the performance of CoMoS/MCM-41 is high for the model feed reaction as compared to commercial CoMoS/alumina, for the commercial feed reaction the performance of the commercial catalyst is much better. Model feed reaction with the addition of carbazole shows that, although this nitrogen-containing compound has a strong inhibiting effect, the lower catalytic performance of CoMoS/MCM-41 in the commercial feed test is probably not solely due to the presence of nitrogen. TEM investigations show that the decrease in activity of the CoMoS/MCM-41 in the nitrogen-containing and commercial feed reactions is not due to sintering of the sulfidic phase. However, it appears that the MCM-41 collapses during the catalytic reactions, and this effect is most pronounced for the commercial feed test. The degradation of the MCM-41 support material does not affect the dispersion of the CoMoS, but induces increased coking.

Original languageEnglish (US)
Pages (from-to)131-135
Number of pages5
JournalCatalysis Letters
Volume90
Issue number3-4
DOIs
StatePublished - Sep 1 2003

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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    Kooyman, P. J., Waller, P., Van Langeveld, A. D., Song, C., Reddy, K. M., & Van Veen, J. A. R. (2003). Stability of MCM-41-supported CoMo hydrotreating catalysts. Catalysis Letters, 90(3-4), 131-135. https://doi.org/10.1023/B:CATL.0000004105.58023.b6