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Selective hydrogenation of nitrobenzene to aniline in dense phase carbon dioxide over Ni/y-Al2O3: Significance of molecular interactions

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Abstract.
The selective hydrogenation of nitrobenzene (NB) over Ni/y-Al2O3 catalysts was investigated using different
media of dense phase CO2, ethanol, and n-hexane. In dense phase CO2, the total rate of NB hydrogenation
was larger than that in organic solvents under similar reaction conditions; the selectivity to the
desired product, aniline, was almost 100% over the whole conversion range of 0–100%. The phase behavior
of the reactant mixture in/under dense phase CO2 was examined at reaction conditions. In situ highpressure
Fourier transform infrared measurements were made to study the molecular interactions of CO2
with the following reactant and reaction intermediates: NB, nitrosobenzene (NSB), and N-phenylhydroxylamine
(PHA). Dense phase CO2 strongly interacts with NB, NSB, and PHA, modifying the reactivity
of each species and contributing to positive effects on the reaction rate and the selectivity to aniline. A
possible reaction pathway for the hydrogenation of NB in/under dense phase CO2 over Ni/y-Al2O3 is also
proposed.

Keywords:
Nitrobenzene
Aniline
Nickel
Hydrogenation
Carbon dioxide
Pressure effect
Intermolecular interaction

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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) 1–10

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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