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Hydrodesulfurization of dibenzothiophene, 4,6-dimethyldibenzothiophene, and their hydrogenated intermediates over Ni–MoS2/y-Al2O3

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Abstract.
The rate constants of all reaction steps in the hydrodesulfurization (HDS) of dibenzothiophene (DBT), 4,6-
dimethyldibenzothiophene (DMDBT), and their tetra- and hexahydro intermediates TH(DM)DBT and
HH(DM)DBT over Ni–MoS2/y-Al2O3 were determined. DBT, THDBT, DMDBT, and THDMDBT underwent
desulfurization by hydrogenolysis of both C–S bonds, while HHDBT and HHDMDBT underwent desulfurization
by cleavage of the aryl C–S bond by hydrogenolysis, followed by cleavage of the cycloalkyl C–S
bond by elimination as well as by hydrogenolysis. Ni promoted the C–S bond breakage of DBT, THDBT,
and HHDBT strongly, but promoted the (de)hydrogenation only weakly. The methyl groups suppressed
the desulfurization in the order DMDBT > THDMDBT > HHDMDBT and promoted hydrogenation.
These different degrees of steric hindrance are due to the hydrogenation of a phenyl ring, which
makes the THDBT and HHDBT rings flexible. H2S strongly inhibited the desulfurization rates in the
order (DM)DBT > TH(DM)DBT > HH(DM)DBT, but inhibited the (de)hydrogenation rates only slightly.
2-Methylpiperidine inhibited the hydrogenation of all molecules.

Keywords:
Hydrodesulfurization
HDS
Dibenzothiophene
4,6-Dimethyldibenzothiophene
Hydrogenated intermediates
Mechanism
Kinetics
Inhibition by H2S
Effect of piperidine
Sulfided NiMo/y-Al2O3

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Informasi Detail

Judul Seri

Journal of Catalysis

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Catalysis 264 (2009) 31–43

Bahasa

English

ISBN/ISSN

00219517

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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