New material as Ni-support for hydrogen production by ethanol conversion

2014 ◽  
Author(s):  
S. Candamano ◽  
P. Frontera ◽  
A. Macario ◽  
A. Aloise ◽  
F. Crea
Keyword(s):  
Hydrogen Production ◽  
Ethanol Conversion ◽  
New Material

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.

Optimal Design, Modeling and Simulation of an Ethanol Steam Reforming Reactor

2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Luis E Arteaga ◽  
Luis M Peralta ◽  
Yannay Casas ◽  
Daikenel Castro
Keyword(s):  
Hydrogen Production ◽  
Modeling And Simulation ◽  
Design Patterns ◽  
Plug Flow ◽  
Fixed Bed ◽  
Cell System ◽  
Fixed Bed Reactor ◽  
Effect Of Temperature ◽  
Ethanol Conversion ◽  
Renewable Hydrogen

The optimum design, modeling and simulation of a fixed bed multi-tube reformer for the renewable hydrogen production are carried out in the present paper. The analogies between plug flow model and a fixed bed reactor are used as design patterns. The steam reformer is designed to produce enough hydrogen to feed a 200kW fuel cell system (>2.19molH/s) and considering 85% of fuel utilization in the cell electrodes. The reactor prototype is optimized and then analyzed using a multiphysics and axisymmetric model, implemented on FEMLABM(R) where the differential mass balance by convection-diffusion and the energy balance for convection-conduction are solved. The temperature profile is controlled to maximize hydrogen production. The catalyst bed internal profiles and the effect of temperature on ethanol conversion and carbon monoxide production are discussed as well.

scholarly journals Thermodynamic Analysis of the Hydrogen Production from Ethanol: First and Second Laws Approaches

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Yannay Casas-Ledón ◽  
Luis E. Arteaga-Perez ◽  
Mayra C. Morales-Perez ◽  
Luis M. Peralta-Suárez
Keyword(s):  
Hydrogen Production ◽  
Thermodynamic Analysis ◽  
Direct Method ◽  
Positive Influence ◽  
State Equation ◽  
Molar Ratio ◽  
Ethanol Conversion ◽  
Hydrogen Yield ◽  
System Quality ◽  
Ethanol Steam

A thermodynamic analysis of hydrogen production from ethanol steam reforming (ESR) is carried out in the present paper. The influence of reactants molar ratio feed into the reforming stage (), temperature (573 to 1173 K) and pressure ( atm) over equilibrium compositions is studied. The direct method employed to analyze the system is the minimization of Gibbs free energy (MGFE) in conjunction with Lee-Kesler state equation, using the Kay mixing rules. The temperature and reactants molar ratio showed a positive influence on the hydrogen yield; ethanol conversion is 100% for the whole interval analyzed while the pressure affected greatly the hydrogen production. The carbon deposition exhibits a maximum value at temperatures around 773 K, and three reactions are proposed to describe the solid carbon formation in a wide temperature range based on thermodynamics and experimental predictions. The conditioning stages (mixing, vaporization, and heating) are studied in addition to the reaction to analyze the system quality by means of an exergetic method applying the 2nd law of thermodynamic.

Hydrogen Production by Ethanol Steam Reforming: Experimental Study of a Pd-Ag Membrane Reactor and Traditional Reactor Behaviour

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Angelo Basile ◽  
Fausto Gallucci ◽  
Adolfo Iulianelli ◽  
Marcello De Falco ◽  
Simona Liguori
Keyword(s):  
Hydrogen Production ◽  
Steam Reforming ◽  
Membrane Reactor ◽  
Experimental Tests ◽  
Cell System ◽  
Ethanol Conversion ◽  
Ethanol Steam Reforming ◽  
Dense Membrane ◽  
Free Hydrogen ◽  
Ethanol Steam

In this experimental work, the ethanol steam reforming reaction for producing hydrogen was studied in both a traditional reactor (TR) and a Pd-Ag dense membrane reactor (MR). Both reactors have been packed with a commercial Ru-based catalyst. The experimental tests have been performed in the temperature range 400-500 °C and in the pressure range 2.0-3.6 bar.The results are reported in terms of ethanol conversion, hydrogen production, product selectivities and hydrogen recovery (for the MR only). It has been found that the MR is able to increase the ethanol conversion as well as increase the hydrogen production with respect to a traditional reactor. Moreover, part of the hydrogen produced in the MR is recovered as a CO-free hydrogen stream and is suitable for feeding a PEM fuel cell system.

Steam-reforming of ethanol for hydrogen production

2011 ◽  
Vol 65 (3) ◽  
Author(s):  
Ahmed Bshish ◽  
Zahira Yaakob ◽  
Binitha Narayanan ◽  
Resmi Ramakrishnan ◽  
Ali Ebshish
Keyword(s):  
Hydrogen Production ◽  
Steam Reforming ◽  
Molar Ratio ◽  
Ethanol Conversion ◽  
Impregnation Method ◽  
Reaction Conditions ◽  
Oxide Supports ◽  
Steam Reforming Of Ethanol ◽  
Production Of Hydrogen ◽  
Hydrogen Selectivity

AbstractProduction of hydrogen by steam-reforming of ethanol has been performed using different catalytic systems. The present review focuses on various catalyst systems used for this purpose. The activity of catalysts depends on several factors such as the nature of the active metal catalyst and the catalyst support, the precursor used, the method adopted for catalyst preparation, and the presence of promoters as well as reaction conditions like the water-to-ethanol molar ratio, temperature, and space velocity. Among the active metals used to date for hydrogen production from ethanol, promoted-Ni is found to be a suitable choice in terms of the activity of the resulting catalyst. Cu is the most commonly used promoter with nickel-based catalysts to overcome the inactivity of nickel in the water-gas shift reaction. γ-Al2O3 support has been preferred by many researchers because of its ability to withstand reaction conditions. However, γ-Al2O3, being acidic, possesses the disadvantage of favouring ethanol dehydration to ethylene which is considered to be a source of carbon deposit found on the catalyst. To overcome this difficulty and to obtain the long-term catalyst stability, basic oxide supports such as CeO2, MgO, La2O3, etc. are mixed with alumina which neutralises the acidic sites. Most of the catalysts which can provide higher ethanol conversion and hydrogen selectivity were prepared by a combination of impregnation method and sol-gel method. High temperature and high water-to-ethanol molar ratio are two important factors in increasing the ethanol conversion and hydrogen selectivity, whereas an increase in pressure can adversely affect hydrogen production.

scholarly journals Hydrogen Production by Ethanol Conversion

2017 ◽  
Author(s):  
Kusman Dossumov ◽  
Gaukhar Y.Yergaziyeva ◽  
Dina Kh.Churina ◽  
Samal Tayrabekova ◽  
Laura K.Myltykbayeva
Keyword(s):  
Hydrogen Production ◽  
Ethanol Conversion

Hydrogen Production from Ethanol Steam Reforming Using Ce- and La- Modified Mesoporous MCM-41 Supported Nickel-Based Catalysts

2019 ◽  
Vol 17 (8) ◽  
Author(s):  
Lida Rahmanzadeh ◽  
Majid Taghizadeh
Keyword(s):  
Hydrogen Production ◽  
Steam Reforming ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Ethanol Conversion ◽  
Steam Reforming Of Ethanol ◽  
Hydrogen Selectivity ◽  
Temperature Programmed ◽  
Adsorption Desorption ◽  
Mcm 41

Abstract Mesoporous MCM-41 containing different amounts of nickel (10, 15 and 20 wt%) and Ce and/or La promoters were prepared by hydrothermal and wet-impregnation methods. The catalysts were characterized by means of temperature-programmed reduction (TPR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), N2 adsorption-desorption, Fourier transform infrared (FT-IR) spectroscopy, and thermogravimetric (TGA) analyses. Then, the catalysts were tested for hydrogen production via steam reforming of ethanol in a fixed bed reactor. Hydrogen selectivity and ethanol conversion over Ni/MCM-41 catalyst were 69.6 % and 94 %, respectively. The best catalytic results were obtained with Ce-Ni/MCM-41 catalyst, i. e. 94 % ethanol conversion and 76.5 % hydrogen selectivity. These results remained constant about 90 h time on stream and ethanol conversion decreased to 87 % after 120 h.

scholarly journals Room temperature synthesis of an amorphous MoS2 based composite stabilized by N-donor ligands and its light-driven photocatalytic hydrogen production

RSC Advances ◽  
2015 ◽  
Vol 5 (83) ◽  
pp. 67742-67751 ◽  
Author(s):  
Felix Niefind ◽  
John Djamil ◽  
Wolfgang Bensch ◽  
Bikshandarkoil R. Srinivasan ◽  
Ilya Sinev ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Room Temperature ◽  
Molybdenum Sulfide ◽  
Donor Ligands ◽  
Temperature Synthesis ◽  
Visible Light Driven ◽  
New Material

An amorphous molybdenum sulfide based composite has been synthesized at room temperature applying a kinetically controlled reaction. The new material exhibits an extraordinary performance in the visible light driven hydrogen evolution reaction.

Plasma-enabled liquid ethanol conversion for hydrogen production: discharge characteristics and process control

2020 ◽  
Vol 53 (17) ◽  
pp. 174001
Author(s):  
Yiyang Li ◽  
Rusen Zhou ◽  
Fei Qi ◽  
Dejiang Zhou ◽  
Renwu Zhou ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Process Control ◽  
Ethanol Conversion ◽  
Discharge Characteristics

Characterization of a monolayer graphitic structure

1994 ◽  
Vol 52 ◽  
pp. 760-761
Author(s):  
X. Lin ◽  
X. K. Wang ◽  
V. P. Dravid ◽  
J. B. Ketterson ◽  
R. P. H. Chang
Keyword(s):  
Three Dimensional ◽  
Single Layer ◽  
Synthesis Process ◽  
Graphitic Structure ◽  
Positive Gaussian Curvature ◽  
Graphitic Sheet ◽  
Structural And Electronic Properties ◽  
New Material ◽  
Hexagonal Network

For small curvatures of a graphitic sheet, carbon atoms can maintain their preferred sp2 bonding while allowing the sheet to have various three-dimensional geometries, which may have exotic structural and electronic properties. In addition the fivefold rings will lead to a positive Gaussian curvature in the hexagonal network, and the sevenfold rings cause a negative one. By combining these sevenfold and fivefold rings with sixfold rings, it is possible to construct complicated carbon sp2 networks. Because it is much easier to introduce pentagons and heptagons into the single-layer hexagonal network than into the multilayer network, the complicated morphologies would be more common in the single-layer graphite structures. In this contribution, we report the observation and characterization of a new material of monolayer graphitic structure by electron diffraction, HREM, EELS.The synthesis process used in this study is reported early. We utilized a composite anode of graphite and copper for arc evaporation in helium.

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