Effect of calcium addition on catalytic ethanol steam reforming of Ni/Al2O3: II. Acidity/basicity, water adsorption and catalytic activity

Catherine K.S. Choong; Lin Huang; Ziyi Zhong; Jianyi Lin; Liang Hong; Luwei Chen

doi:10.1016/j.apcata.2011.08.038

Effect of calcium addition on catalytic ethanol steam reforming of Ni/Al₂O₃: II. Acidity/basicity, water adsorption and catalytic activity

Catherine K.S. Choong, Lin Huang, Ziyi Zhong, Jianyi Lin, Liang Hong^*, Luwei Chen

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

91 Scopus citations

Abstract

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 H₂ production. The introduction of Ca greatly reduces the acidity of Al₂O ₃, 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 H₂, CH ₄ 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.

Original language	English
Pages (from-to)	155-162
Number of pages	8
Journal	Applied Catalysis A: General
Volume	407
Issue number	1-2
DOIs	https://doi.org/10.1016/j.apcata.2011.08.038
State	Published - 4 Nov 2011
Externally published	Yes

Keywords

Acidity
Calcium oxide
Ethanol
Nickel catalyst
Steam reforming
Surface OH groups
Water adsorption

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10.1016/j.apcata.2011.08.038

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title = "Effect of calcium addition on catalytic ethanol steam reforming of Ni/Al2O3: II. Acidity/basicity, water adsorption and catalytic activity",

abstract = "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 H2 production. The introduction of Ca greatly reduces the acidity of Al2O 3, 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 H2, CH 4 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.",

keywords = "Acidity, Calcium oxide, Ethanol, Nickel catalyst, Steam reforming, Surface OH groups, Water adsorption",

author = "Choong, {Catherine K.S.} and Lin Huang and Ziyi Zhong and Jianyi Lin and Liang Hong and Luwei Chen",

note = "Funding Information: We gratefully acknowledge the Agency of Science, Technology and Research (A*STAR), Singapore for its financial support. ",

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AU - Choong, Catherine K.S.

AU - Huang, Lin

AU - Zhong, Ziyi

AU - Lin, Jianyi

AU - Hong, Liang

AU - Chen, Luwei

N1 - Funding Information: We gratefully acknowledge the Agency of Science, Technology and Research (A*STAR), Singapore for its financial support.

PY - 2011/11/4

Y1 - 2011/11/4

N2 - 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 H2 production. The introduction of Ca greatly reduces the acidity of Al2O 3, 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 H2, CH 4 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.

AB - 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 H2 production. The introduction of Ca greatly reduces the acidity of Al2O 3, 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 H2, CH 4 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.

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KW - Ethanol

KW - Nickel catalyst

KW - Steam reforming

KW - Surface OH groups

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Effect of calcium addition on catalytic ethanol steam reforming of Ni/Al₂O₃: II. Acidity/basicity, water adsorption and catalytic activity

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