scholarly journals Fuel-cell grade hydrogen production by coupling steam reforming of ethanol and carbon monoxide removal

2018 ◽  
Vol 43 (36) ◽  
pp. 17216-17229 ◽  
Author(s):  
Bernay Cifuentes ◽  
Felipe Bustamante ◽  
Juan A. Conesa ◽  
Luis F. Córdoba ◽  
Martha Cobo
Keyword(s):  
Carbon Monoxide ◽  
Fuel Cell ◽  
Hydrogen Production ◽  
Steam Reforming ◽  
Steam Reforming Of Ethanol

Carbon monoxide-free hydrogen production via low-temperature steam reforming of ethanol over iron-promoted Rh catalyst

2010 ◽  
Vol 276 (2) ◽  
pp. 197-200 ◽  
Author(s):  
Luwei Chen ◽  
Catherine Kai Shin Choong ◽  
Ziyi Zhong ◽  
Lin Huang ◽  
Thiam Peng Ang ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Low Temperature ◽  
Hydrogen Production ◽  
Steam Reforming ◽  
Steam Reforming Of Ethanol ◽  
Free Hydrogen ◽  
Rh Catalyst

scholarly journals Comparative Study of Ni-W /CeO2, Ni-W /y-Al2O3 and Ni-W /HT Catalysts for H2 Production by Steam Reforming of Bioethanol

Quimica Hoy ◽  
2011 ◽  
Vol 2 (1) ◽  
pp. 3
Author(s):  
Paz Hernández ◽  
Arturo Fernández ◽  
Sarah Messina
Keyword(s):  
Catalytic Activity ◽  
Fuel Cell ◽  
Hydrogen Production ◽  
Comparative Study ◽  
Steam Reforming ◽  
Carbon Deposition ◽  
Nickel Content ◽  
H2 Production ◽  
Good Stability ◽  
Steam Reforming Of Ethanol

Ni-W catalysts supported on CeO2,Al2O3 and hydrotalcite (HT) were studied in the steam reforming of ethanol at 500-650ºC. The CeO2 and HT were synthesized by impregnation and direct coprecipitation methods, respectively. Commercial Al2O3 was used. Nickel content was varied from 10, 15 and 30% with 1% W. The catalyst that presented the highest catalytic activity and selectivity to hydrogen was 10% Ni-W/HT. Conversion to ethanol was 100% and selectivities to H2, CH4, CO2 and CO were 75, 5.78, 0.37 and 18.85%, respectively, at a temperature of 500 ºC. Moreover, these catalysts showed good stability with respect to carbon deposition and low selectivity towards C2H4 production. These are desirable features for catalysts to be used in hydrogen production for fuel cell applications.

Hydrogen production by steam reforming of ethanol over Ni/Al 2 O 3 -La 2 O 3 xerogel catalysts

2017 ◽  
Vol 434 ◽  
pp. 123-133 ◽  
Author(s):  
Ji Hwan Song ◽  
Sangbeom Yoo ◽  
Jaekyeong Yoo ◽  
Seungwon Park ◽  
Min Yeong Gim ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Steam Reforming ◽  
Steam Reforming Of Ethanol

Physical-Chemical and Thermodynamic Analyses of Ethanol Steam Reforming for Hydrogen Production

2006 ◽  
Vol 3 (3) ◽  
pp. 346-350 ◽  
Author(s):  
Antonio Carlos Caetano de Souza ◽  
José Luz-Silveira ◽  
Maria Isabel Sosa
Keyword(s):  
Hydrogen Production ◽  
Steam Reforming ◽  
Production Efficiency ◽  
Physical Chemical ◽  
Steam Reforming Of Ethanol ◽  
Thermodynamic Conditions ◽  
High Production ◽  
Exergetic Analysis ◽  
Global Reaction ◽  
Technical Features

Steam reforming is the most usual method of hydrogen production due to its high production efficiency and technological maturity. The use of ethanol for this purpose is an interesting option because it is a renewable and environmentally friendly fuel. The objective of this article is to present the physical-chemical, thermodynamic, and exergetic analysis of a steam reformer of ethanol, in order to produce 0.7Nm3∕h of hydrogen as feedstock of a 1kW PEMFC. The global reaction of ethanol is considered. Superheated ethanol reacts with steam at high temperatures producing hydrogen and carbon dioxide, depending strongly on the thermodynamic conditions of reforming, as well as on the technical features of the reformer system and catalysts. The thermodynamic analysis shows the feasibility of this reaction in temperatures about 206°C. Below this temperature, the reaction trends to the reactants. The advance degree increases with temperature and decreases with pressure. Optimal temperatures range between 600 and 700°C. However, when the temperature attains 700°C, the reaction stability occurs, that is, the hydrogen production attains the limit. For temperatures above 700°C, the heat use is very high, involving high costs of production due to the higher volume of fuel or electricity used. The optimal pressure is 1atm., e.g., at atmospheric pressure. The exergetic analysis shows that the lower irreversibility is attained for lower pressures. However, the temperature changes do not affect significantly the irreversibilities. This analysis shows that the best thermodynamic conditions for steam reforming of ethanol are the same conditions suggested in the physical-chemical analysis.

Catalytic properties of Ag promoted ZnO/Al2O3 catalysts for hydrogen production by steam reforming of ethanol

2011 ◽  
Vol 36 (13) ◽  
pp. 7516-7522 ◽  
Author(s):  
Meng-Nan Chen ◽  
Dong-Yun Zhang ◽  
Levi T. Thompson ◽  
Zi-Feng Ma
Keyword(s):  
Hydrogen Production ◽  
Steam Reforming ◽  
Catalytic Properties ◽  
Steam Reforming Of Ethanol

scholarly journals Steam reforming of ethanol for hydrogen production: influence of catalyst composition (Ni/Al2O3, Ni/Al2O3–CeO2, Ni/Al2O3–ZnO) and process conditions

2021 ◽  
Vol 132 (2) ◽  
pp. 907-919
Author(s):  
O. Shtyka ◽  
Z. Dimitrova ◽  
R. Ciesielski ◽  
A. Kedziora ◽  
G. Mitukiewicz ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Steam Reforming ◽  
Catalyst Stability ◽  
Feed Ratio ◽  
Ethanol Conversion ◽  
Process Conditions ◽  
Catalyst Activation ◽  
Catalyst Composition ◽  
Activity Measurements ◽  
Steam Reforming Of Ethanol

AbstractEthanol steam reforming was studied over Ni supported catalysts. The effects of support (Al2O3, Al2O3–ZnO, and Al2O3–CeO2), metal loading, catalyst activation method, and steam-to-ethanol molar feed ratio were investigated. The properties of catalysts were studied by N2 physisorption, TPD-CO2, X-ray diffraction, and temperature programmed reduction. After activity tests, the catalysts were analyzed by TOC analysis. The catalytic activity measurements showed that the addition either of ZnO SSor CeO2 to alumina enhances both ethanol conversion and promotes selectivity towards hydrogen formation. The same effects were observed for catalysts with higher metal loadings. High process temperature and high water-to-ethanol ratio were found to be beneficial for hydrogen production. An extended catalyst stability tests showed no loss of activity over 50 h on reaction stream. The TOC analysis of spent catalysts revealed only insignificant amounts of carbon deposit.

Synthesis of CuO/ZnO/Al2O3/ZrO2/CeO2 nanocatalysts via homogeneous precipitation and combustion methods used in methanol steam reforming for fuel cell grade hydrogen production

RSC Advances ◽  
2016 ◽  
Vol 6 (62) ◽  
pp. 57199-57209 ◽  
Author(s):  
Saeed Khajeh Talkhoncheh ◽  
Mohammad Haghighi ◽  
Shahab Minaei ◽  
Hossein Ajamein ◽  
Mozaffar Abdollahifar
Keyword(s):  
Fuel Cell ◽  
Hydrogen Production ◽  
Steam Reforming ◽  
Synthesis Method ◽  
Methanol Steam Reforming ◽  
Homogeneous Precipitation ◽  
Steam Reforming Of Methanol

In this research the effects of synthesis method and CeO2 and ZrO2 promoters were studied in the steam reforming of methanol over a CuO/ZnO/Al2O3 nanocatalyst. Addition of ZrO2 and CeO2 reduces CO selectivity, while CeO2 is more effective.

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