Journal
APPLIED CATALYSIS A-GENERAL
Volume 407, Issue 1-2, Pages 155-162Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2011.08.038
Keywords
Steam reforming; Ethanol; Nickel catalyst; Calcium oxide; Acidity; Surface OH groups; Water adsorption
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Funding
- Agency of Science, Technology and Research (A*STAR), Singapore
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The effect of Ca modification to Ni/Al2O3 catalysts in ethanol steam reforming was studied by using a 5-channel micro-reactor, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and temperature-programmed desorption (TPD) of probe molecules H2O, NH3, CO2 and ethanol. Both Al2O3 and Ca-modified Al2O3 supports are not catalytically active for the ethanol reforming. But in the presence of the active metal Ni, the catalytic performance of Ni/Ca-Al2O3 is far more superior to Ni/Al2O3 for low temperature H-2 production. The introduction of Ca greatly reduces the acidity of Al2O3, depressing ethanol dehydration and ethylene formation. It brings about positive attributes such as increasing water adsorption, providing Ni catalyst the proximity and abundance of adsorbed OH groups. The involvement of OH groups in the reactions in turn enhances the ethanol adsorption, stabilizes its adsorbate intermediates for further conversions to H-2, CH4 and CO2 at relatively low temperatures. This paper therefore serves to illustrate the importance of acidity and steam adsorption capacity in the design of the catalysts for ethanol steam reforming. (C) 2011 Elsevier B.V. All rights reserved.
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