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The role of rhenium in the conversion of glycerol to synthesis gas over carbon supported platinum–rhenium catalysts

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Abstract.
Reaction kinetics measurements were carried out to study the conversion of aqueous solutions of glycerol
(30 and 80 wt%) over carbon-supported Pt and Pt–Re catalysts at temperatures from 483 to 523 K. The
results of these studies show that the turnover frequencies for production of H2, CO, CO2, and light
alkanes (primarily methane) all increase upon the addition of Re to Pt/C catalysts. The molar ratio of
H2/CO increases, while the CO/CO2 ratio decreases with Re addition, indicating increased rate of water–
gas shift. For glycerol conversion over a Pt–Re/C catalyst with an atomic Pt:Re ratio of 1:1, increasing
pressure or decreasing temperature leads to an increase in the production of alkanes and light oxygenated
hydrocarbons (ethanol, methanol, propanediols, and acetone) at the expense of CO and CO2. Temperatureprogrammed desorption studies and microcalorimetric measurements indicate that addition of Re to Pt modifies the interaction of CO with surface sites. X-ray absorption spectroscopy and transmission electron
microscopy studies provide evidence indicating that Pt–Re/C catalysts consist primarily of bimetallic
nanoparticles with sizes below 2 nm, and Re inhibits the sintering of these nanoparticles during reaction
conditions for glycerol conversion. The results of these reaction kinetic studies and characterization
studies indicate that the performance of Pt–Re/C catalysts for glycerol conversion is related to the
formation of Pt–Re nanoparticles, for which Re promotes the overall rate of glycerol reforming by
reducing the binding energy of CO to Pt, thereby leading to less extensive blocking of surface sites by
reaction intermediates and/or products. In addition, the presence of Re facilitates water–gas shift and
C–O bond cleavage reactions.

Keywords:
Glycerol
Reforming
Platinum
Rhenium
Bimetallic 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) 164–177

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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