Hydrogen Production by Ethanol Steam Reforming Over Cu and Ni Catalysts Supported on ZrO2 and Al2O3 Microspheres

Ethanol reforming process to produce hydrogen rich-gas stream is performed using Cu/Ni catalyst supported on zirconia and alumina microspheres prepared by hydrolysis method. Theses catalysts were tested in a fixed-bed reactor system employing steam reforming of ethanol. The operating temperature was 550°C and water/ethanol feed ratio 3/1. Although all catalysts were very active for ethanol conversion and very selective towards the desired products, but that one supported on zirconia microspheres was produced slightly better results. The data reveal high activity of the Cu/Ni/ZrO2 catalyst for ethanol steam reforming and presented a good selectivity for H2.

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Hydrogen Production from Ethanol Steam Reforming: Fixed Bed Reactor Design

International Journal of Chemical Reactor Engineering ◽

10.2202/1542-6580.1582 ◽

2008 ◽

Vol 6 (1) ◽

Cited By ~ 2

Author(s):

Pablo Giunta ◽

Norma Amadeo ◽

Miguel Laborde

Keyword(s):

Steam Reforming ◽

Flow Model ◽

Multicomponent Mixture ◽

Plug Flow ◽

Fixed Bed ◽

Fixed Bed Reactor ◽

Ethanol Steam Reforming ◽

Heterogeneous Model ◽

Ethanol Steam ◽

Hydrogen Stream

The aim of this work is to design an ethanol steam reformer to produce a hydrogen stream capable of feeding a 60 kW PEM fuel cell applying the plug flow model, considering the presence of the catalyst bed (heterogeneous model). The Dusty-Gas Model is employed for the catalyst, since it better predicts the fluxes of a multicomponent mixture. Moreover, this model has shown to be computationally more robust than the Fickian Model. A power law-type kinetics was used. Results showed that it is possible to carry out the ethanol steam reforming in a compact device (1.66 x 10 -5 to 5.27 x 10 -5 m3). It was also observed that this process is determined by heat transfer.

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Hydrogen Production from Ethanol Steam Reforming over Ni-Cu/ZnO Catalyst

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.236-238.1067 ◽

2011 ◽

Vol 236-238 ◽

pp. 1067-1072

Author(s):

Li Ping Liu ◽

Xiao Jian Ma ◽

Peng Zhang ◽

Ya Nan Liu

Keyword(s):

Hydrogen Production ◽

Steam Reforming ◽

Fixed Bed ◽

Surface Characteristics ◽

Catalytic Performance ◽

Fixed Bed Reactor ◽

Molar Ratio ◽

Ethanol Steam Reforming ◽

Hydrogen Yield ◽

Ethanol Steam

Hydrogen production by ethanol steam reforming over Ni-Cu/ZnO catalyst in the temperatures range of 250-550°C was studied on a fixed bed reactor. The effects of reaction temperature and water/ethanol molar ratio on hydrogen production were investigated. The structure and surface characteristics of the catalyst were measured by scanning electron microscopy (SEM), X-ray diffraction (XRD) and differential thermal analyzer (TG-DSC). The results show that the Ni-Cu/ZnO catalyst has good catalytic performance with higher hydrogen yield of 4.87molH2/molEtOH reacted. A comparison of hydrogen production from ethanol steam reforming over Ni-Cu/ZnO catalyst with over a commercial catalyst was made in this paper.

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Sorption-Enhanced Ethanol Steam Reforming Process in a Fixed-Bed Reactor

Industrial & Engineering Chemistry Research ◽

10.1021/acs.iecr.8b01657 ◽

2018 ◽

Vol 57 (34) ◽

pp. 11547-11553 ◽

Cited By ~ 8

Author(s):

R. Belén Menendez ◽

Cecilia Graschinsky ◽

Norma E. Amadeo

Keyword(s):

Steam Reforming ◽

Fixed Bed ◽

Fixed Bed Reactor ◽

Ethanol Steam Reforming ◽

Ethanol Steam

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Production of Hydrogen from Ethanol Using Pt/Hydrotalcite Catalysts Stabilized with Tungsten Oxides

Journal of New Materials for Electrochemical Systems ◽

10.14447/jnmes.v15i3.68 ◽

2012 ◽

Vol 15 (3) ◽

pp. 215-223 ◽

Cited By ~ 3

Author(s):

J.L. Contreras ◽

M.A. Ortiz ◽

R. Luna ◽

G.A. Fuentes ◽

M. Autié ◽

...

Keyword(s):

Crystal Structure ◽

Steam Reforming ◽

Fixed Bed ◽

Thermal Stabilization ◽

Fixed Bed Reactor ◽

Ethanol Steam Reforming ◽

Vis Spectroscopy ◽

Production Of Hydrogen ◽

Stabilization Effect ◽

Ethanol Steam

An stabilization effect of WOx over the Pt/hydrotalcite catalysts to produce H2 by ethanol steam reforming at low concentration was studied. The catalysts were characterized by N2 physisorption, X-ray diffraction, Infrared (IR), and UV-vis spectroscopy. The catalytic tests were made in a fixed bed reactor. The catalysts showed porous with the shape of parallel layers with a monomodal mesoporous distribution. By IR spectroscopy it was found superficial chemical such as: -OH, H2O, Al-OH, Mg-OH, and CO32-. The reaction products were; H2, CO2, CH3CHO, CH4 and C2H4. These catalysts did not produce CO and showed low selectivity to C2H4. By XRD we found that catalysts having Pt and the lowest W concentration showed the highest crystallinity and the highest stability during the reaction of ethanol steam reforming. A possible thermal stabilization effect of W in the hydrotalcite crystal structure leading to prevent the Pt sintering is proposed. By IR the hydrotalcite hydroxil groups coordinated with Mg and Al decreased by the presence of WOx. We found that catalysts with low W concentration and Pt having high crystallinity showed the highest stability after ethanol steam reforming. It could be a possible thermal stabilization effect of W in the hydrotalcite crystal structure leading to prevent the Pt sintering.

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A review on mechanistic kinetic models of ethanol steam reforming for hydrogen production using a fixed bed reactor

Chemical Papers ◽

10.1007/s11696-018-00678-6 ◽

2019 ◽

Vol 73 (5) ◽

pp. 1027-1042 ◽

Cited By ~ 6

Author(s):

Kumargaurao D. Punase ◽

Nihal Rao ◽

P. Vijay

Keyword(s):

Hydrogen Production ◽

Steam Reforming ◽

Kinetic Models ◽

Fixed Bed ◽

Fixed Bed Reactor ◽

Ethanol Steam Reforming ◽

Ethanol Steam

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

International Journal of Chemical Reactor Engineering ◽

10.1515/ijcre-2018-0212 ◽

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.

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Influence of Cs Promoter on Ethanol Steam-Reforming Selectivity of Pt/m-ZrO2 Catalysts at Low Temperature

Catalysts ◽

10.3390/catal11091104 ◽

2021 ◽

Vol 11 (9) ◽

pp. 1104

Author(s):

Zahra Rajabi ◽

Li Jones ◽

Michela Martinelli ◽

Dali Qian ◽

Donald C. Cronauer ◽

...

Keyword(s):

Low Temperature ◽

Steam Reforming ◽

Fixed Bed ◽

Ethanol Conversion ◽

Ethanol Steam Reforming ◽

Production Of Hydrogen ◽

Temperature Programmed ◽

Metallic Function ◽

Temperature Programmed Reaction ◽

Ethanol Steam

The decarboxylation pathway in ethanol steam reforming ultimately favors higher selectivity to hydrogen over the decarbonylation mechanism. The addition of an optimized amount of Cs to Pt/m-ZrO2 catalysts increases the basicity and promotes the decarboxylation route, converting ethanol to mainly H2, CO2, and CH4 at low temperature with virtually no decarbonylation being detected. This offers the potential to feed the product stream into a conventional methane steam reformer for the production of hydrogen with higher selectivity. DRIFTS and the temperature-programmed reaction of ethanol steam reforming, as well as fixed bed catalyst testing, revealed that the addition of just 2.9% Cs was able to stave off decarbonylation almost completely by attenuating the metallic function. This occurs with a decrease in ethanol conversion of just 16% relative to the undoped catalyst. In comparison with our previous work with Na, this amount is—on an equivalent atomic basis—just 28% of the amount of Na that is required to achieve the same effect. Thus, Cs is a much more efficient promoter than Na in facilitating decarboxylation.

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

Reaction Kinetics Mechanisms and Catalysis ◽

10.1007/s11144-021-01945-6 ◽

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.

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