Mechanism of hydrodesulfurization of dibenzothiophenes on unsupported NiMoW catalyst

YIN Chang-long; ZHAI Xi-ping; ZHAO Lei-yan; LIU Chen-guang

Volume 41 Issue 08

Aug. 2013

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Article Navigation > Journal of Fuel Chemistry and Technology > 2013 > 41(08): 991-997

YIN Chang-long, ZHAI Xi-ping, ZHAO Lei-yan, LIU Chen-guang. Mechanism of hydrodesulfurization of dibenzothiophenes on unsupported NiMoW catalyst[J]. Journal of Fuel Chemistry and Technology, 2013, 41(08): 991-997.

Citation:

YIN Chang-long, ZHAI Xi-ping, ZHAO Lei-yan, LIU Chen-guang. Mechanism of hydrodesulfurization of dibenzothiophenes on unsupported NiMoW catalyst[J]. Journal of Fuel Chemistry and Technology, 2013, 41(08): 991-997.

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Mechanism of hydrodesulfurization of dibenzothiophenes on unsupported NiMoW catalyst

State Key Laboratory of Heavy Oil Processing, Key Laboratory of Catalysis, CNPC, China University of Petroleum(East China), Qingdao 266580, China

Received Date: 2013-03-19
Rev Recd Date: 2013-05-20
Publish Date: 2013-08-30

Abstract

Abstract

Hydrodesulfurization (HDS) of dibenzothiophene (DBT), 4-methyldibenzothiophene (4-MDBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) on unsupported NiMoW catalyst was studied. Moreover, mechanisms and reaction networks were revealed on the basis of GC and GC-MS analyses of the reaction products. The result shows that, the HDS rate of dibenzothiophenes is in the order of 4,6-DMDBT≈4-MDBT＜DBT for the spatial restraining effect of the methyl group. Unsupported NiMoW catalyst has high hydrogenation activity in aromatics saturation, it favours the hydrogenation of alkyl-substituted aromatic ring, weakens the spatial restraining effect, leads to the effectively removing of alkyl-substituted dibenzothiophenes. The hydrodesulfurization products of DBT could be hydrogenated further and its distribution is similar to the hydrogenation products of biphenyl(BP). The hydrogenation route of the hydrodesulfurization of 4-MDBT have two reaction pathways, the electron donor induction of the methyl group could promote the hydrogenation of the adjacent phenyl. On the lewis acid sites of catalyst, part of 4-MDBT and 4,6-DMDBT transformed into DBT through the demethylation reaction in their hydrodesulfurization process.
- dibenzothiophene,
- 4-methyldibenzothiophene,
- 4,6-dimethyldibenzothiophene,
- hydrodesulfurization,
- reaction networks,
- unsupported NiMoW catalyst

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References(16)

References

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