Deactivation mechanism of NiMo catalyst during the ultra deep hydrodesulfurization of gas oil: Characterization of the spent catalysts by means of temperature programmed oxidation and laser desorption/ionization-time of flight mass spectroscopy

Naoto Koizumi, Yoshihisa Urabe, Hikotaro Suzuki, Takashi Itoh, Muneyoshi Yamada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The present study has characterized the spent NiMo catalysts used for the ultra deep HDS of gas oil in commercial plants for ca. 2 years by means of temperature programmed oxidation and laser desorption/ionization-time of flight mass spectroscopy, in order to make clear its deactivation mechanism under commercial operations. The deposition of carbonaceous compounds was observed by these techniques on all the spent catalysts examined here. Furthermore, their molecular structure and chemical nature (combustive property) strongly depended on the catalyst position in the HDS reactor, where more refractory carbonaceous compound with condensed aromatic structures was observed only on the spent catalysts charged near the outlet of the HDS reactor. Considering the residual HDS activity of the spent catalysts, we proposed that the deposition of such the refractory carbonaceous compound on the catalysts causes the (entire) catalyst deactivation during the ultra deep HDS of gas oil, especially at the beginning of on stream.

Original languageEnglish
Title of host publicationAbstracts of Papers - 232nd American Chemical Society Meeting and Exposition
Volume232
Publication statusPublished - 2006 Dec 1
Event232nd American Chemical Society Meeting and Exposition - San Francisco, CA, United States
Duration: 2006 Sep 102006 Sep 14

Other

Other232nd American Chemical Society Meeting and Exposition
Country/TerritoryUnited States
CitySan Francisco, CA
Period06/9/1006/9/14

ASJC Scopus subject areas

  • Chemistry(all)

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