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Preparation of hydrotreating catalysts via an oxalic acid-assisted hydrothermal deposition method

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Abstract.
An oxalic acid-assisted hydrothermal deposition method to prepare highly dispersed W/γ -Al2O3 and
NiW/γ -Al2O3 hydrodesulfurization catalysts without strengthening the metal–support interaction was
developed and compared with the conventional impregnation method. The resulting oxidic and sulfided
catalysts were characterized, and their catalytic performance was assessed. The results showed that the
oxalic acid-assisted hydrothermal deposition method can better disperse tungsten oxide on γ -Al2O3
while decreasing the metal–support interaction, resulting in more efficient sulfidation of tungsten oxide
and formation of highly stacked WS2 slabs with short length, and thereby the significantly enhanced
hydrodesulfurization activity of the resulting catalysts. The improved dispersion of W species is attributed
to the anti-aggregation effect of the oxalic acid adsorbed on active metal particles formed during the
hydrothermal deposition process, whereas the strong interaction between carboxyl groups of oxalic acid
and hydroxyl groups or unsaturated Al3+ on alumina surface accounts for the weakened metal–support
interaction.

Keywords:
Oxalic acid
Hydrothermal deposition method
Dispersion
Metal–support interaction
Hydrodesulfurization catalyst

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Informasi Detail

Judul Seri

Journal of Catalysis

No. Panggil

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Penerbit

London : Elsevier Inc.., 2008

Deskripsi Fisik

Journal of Catalysis 260 (2008) 119–127

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

Versi lain/terkait

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