@Article{OliveiraValeViei:2015:WaGaSh,
author = "Oliveira, N. M. B. and Valen{\c{c}}a, G. P. and Vieira, Ricardo",
affiliation = "{Universidade Estadual de Campinas (UNICAMP)} and {Universidade
Estadual de Campinas (UNICAMP)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)}",
title = "Water gas shift reaction on copper catalysts supported on alumina
and carbon nanofibers",
journal = "Chemical Engineering Transactions",
year = "2015",
volume = "43",
pages = "931--936",
abstract = "The water gas shift (WGS) reaction is widely used in the
production of hydrogen, by the conversion of carbon monoxide into
CO2 and of water into H2. In the present work, copper catalysts
supported on alumina or carbon nanofibers (CNF) were used to study
the WGS reaction. The catalysts were prepared by impregnating
copper nitrate in the supports, with a nominal mass metallic
content of 5%. The solids were dried, calcined and characterized
by X-Ray Diffraction (XRD), nitrogen adsorption, nitrous oxide
chemisorption and Inductively Coupled Plasma Optical Emission
Spectrometry (ICP OES). After calcination, the catalysts were
loaded into the reactor, reduced and then tested in the WGS
reaction at medium temperatures (398-573 K). The gases from
reactor were analyzed online by Gas Chromatography (GC). The
products were CO2, H2 and, probably, small amounts of coke. The CO
partial pressure varied between 4.6 and 6.6 kPa, and the water
partial pressure varied between 20.0 and 47.4 kPa. Among the
catalysts tested, 5% Cu/Al2O2 was the most active under all
conditions used in this work, due to the high dispersion of the
metal particles on the support. The most favorable reaction
conditions for this catalyst were pH2O 0 = 38.6 kPa and pCO 0 =
5.3 kPa (H2O:CO molar ratio of 7.3), for all reaction temperatures
used in this work. Cu/CNF had low CO conversions, due to the
support hydrophobicity. In case of this catalyst, the most
favorable conditions were pH2O 0 = 20.0 kPa and pCO 0 = 6.6 kPa,
corresponding to a H2O:CO molar ratio of 3.1. The apparent
activation energy calculated for the WGS reaction was 86.1 kJ
mol-1 for 5%Cu/Al2O and 69.8 kJ mol-1 for 5%Cu/CNF. For Cu/CNF a
co-operative redox reaction mechanism was proposed, and apparent
reaction orders were 0.64 in relation to CO and approximately zero
in relation to water.",
doi = "10.3303/CET1543156",
url = "http://dx.doi.org/10.3303/CET1543156",
issn = "1974-9791",
language = "en",
targetfile = "2015_oliveira.pdf",
urlaccessdate = "27 abr. 2024"
}