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Surface State and Catalytic Performance of Ceria‐Supported Cobalt Catalysts in the Steam Reforming of Ethanol
Author(s) -
Turczyniak Sylwia,
Greluk Magdalena,
Słowik Grzegorz,
Gac Wojciech,
Zafeiratos Spyridon,
Machocki Andrzej
Publication year - 2017
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201601343
Subject(s) - catalysis , steam reforming , selectivity , cobalt , dehydrogenation , oxygen , chemistry , coke , inorganic chemistry , molar ratio , ethanol , oxidation state , particle size , chemical engineering , cobalt oxide , organic chemistry , hydrogen production , engineering
The effect of the particle size and the addition of a K promoter on the oxidation state of Co/CeO 2 was investigated and correlated with selectivity for ethanol steam reforming performed with various H 2 O/EtOH molar ratios. Spectroscopic studies showed that the oxidation state of the catalyst components depends on the H 2 O/EtOH molar ratio. Surface oxygen‐containing species (OH and K δ + −O δ − ) are necessary to achieve a good catalyst selectivity, to decrease the amount of coke deposited and to change the nature of the product from fully dehydrogenated C=C to CH x . Besides the surface concentration of oxygen‐containing species, the catalyst morphology and the location at which oxygen‐containing species are chemisorbed may be equally important to their abundance; the selective ceria‐supported Co catalyst should have well‐dispersed Co particles deposited on a well‐dispersed support.