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Effects of oxidative modification of carbon surface on the adsorption of sulfur compounds in diesel fuel

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Abstract.
This work examines the effects of modification of activated carbons (ACs) by HNO3 oxidation and gasphase
O2 oxidation, respectively, on the liquid-phase adsorption of sulfur compounds in diesel fuel. The
adsorption characteristics of the oxidized and the original AC samples were evaluated in a fixed-bed
flow systemby using amodel diesel fuel containing 400 parts per million byweight (ppmw) of sulfur as
thiophenic compounds and 10 wt% of aromatics in a paraffinic solvent. The pore structure and surface
properties of the AC samples were characterized by N2 adsorption, SEM, FTIR, XPS and surface pH
measurements. The adsorptive selectivity factor of the AC samples increases in the order of
benzothiophene (BT)  naphthalene (Nap) < 2-methyl naphthalene (2-MNap) < dibenzothiophene
(DBT) < 4-methyldibenzothiophene (4-MDBT) < 4,6-dimethyldibenzothiophene (4,6-DMDBT). It was
found that the HNO3 oxidationwas an efficient method in improvement of the adsorption performance
of the AC for sulfur compounds. The improved adsorption performance upon theHNO3 oxidation can be
attributed mainly to an increase in the acidic oxygen-containing functional groups. However, the
improved adsorption capacity upon oxidation is unlikely due to an increase in mesoporous or
microporous surface/volume, although such attribution might have been inferred from the literature.
An excellent correlation between the concentration of the surface oxygen-containing functional groups
and the adsorption capacity per unit area aswell as a good relationship between the adsorption capacity
and the surface pH value were observed in this work, which suggest that the adsorption of the sulfur
compounds over AC from the liquid hydrocarbon fuel may involve an interaction of the acidic oxygencontaining
groups on AC with the sulfur compounds.

Keywords: Oxidative modification, Carbon surface, Adsorption, Adsorptive desulfurization, Sulfur compounds, Diesel fuel, Activated carbon, Dibenzothiophene, Dimethyldibenzothiophene

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Informasi Detail

Judul Seri

Applied Catalysis B: Environmental

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Catalysis B: Environmental 87 (2009) 190–199

Bahasa

English

ISBN/ISSN

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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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