Performance of Rh/Al2O3 catalyst in the steam reforming of ethanol: H2 production for MCFC

Cavallaro, S.; Chiodo, V.; Freni, S.; Mondello, N.; Frusteri, F.

doi:10.1016/s0926-860x(03)00189-3

Cited by 242 publications

(111 citation statements)

References 16 publications

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“…Furthermore, Rh materials are active in C=C bond activation. Considering that the main species that reach the catalyst surface are CO and olefins (C2H4, C3H6), it is therefore deducible that the catalytic performance depends on the tendency towards C=C cleavage and coke formation inhibition through polymerization of CHx species and/or CO dissociation (Boudouard reaction) [129][130][131][132]. Despite this, there are still some improvements that need to be done regarding the relatively fast deactivation of Rh-based catalysts.…”

Section: Other Noble Metal-based Catalystsmentioning

confidence: 99%

Challenges and strategies for optimization of glycerol steam reforming process

Silva

Soria

Madeira

2015

Renewable and Sustainable Energy Reviews

203

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The steam reforming of the main biodiesel by-product, glycerol, has been catching up the interest of the scientific community in the last years. The use of glycerol for hydrogen production is an advantageous option not only because glycerol is renewable but also because it's use would lead to the decrease of the price of biodiesel, thus making it more competitive. Consequently, the use of biodiesel at large scale would significantly reduce CO2 emissions comparatively to fossil fuels. Moreover, hydrogen itself is seen as a very attractive clean fuel for transportation purposes.Therefore, the industrialization of the glycerol steam reforming (GSR) process would have a tremendous global environmental impact. In the last years, intensive research regarding GSR thermodynamics, catalysts, reaction mechanisms and kinetics, and innovative reactor configurations (sorption enhanced reactors (SERs) and membrane reactors (MRs)) has been done, aiming for improving the process effectiveness. In this review, the main challenges and strategies adopted for optimization of GSR process are addressed, namely the GSR thermodynamic aspects, the last developments on catalysis and kinetics, as well as the last advances on GSR performed in SERs and MRs.

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Section: Other Noble Metal-based Catalystsmentioning

confidence: 99%

Challenges and strategies for optimization of glycerol steam reforming process

Silva

Soria

Madeira

2015

Renewable and Sustainable Energy Reviews

203

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show abstract

“…Under these perspectives, several catalytic systems, involving mainly base (e.g., Ni, Co, Cu) and precious (e.g., Pt, Rh, Ru, Pd, and Ir) metal supported catalysts have been reported for ESR [10,12]. Although the noble metal-based catalysts demonstrate sufficient reforming activity in a wide temperature range [10,12,[14][15][16][17][18][19], their large-scale implementation in practice is limited by their significant high cost [20]. Hence, the development of active and stable non-precious metal catalysts for ESR is highly desirable.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production by Ethanol Steam Reforming (ESR) over CeO2 Supported Transition Metal (Fe, Co, Ni, Cu) Catalysts: Insight into the Structure-Activity Relationship

et al. 2016

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Abstract:The aim of the present work was to investigate steam reforming of ethanol with regard to H 2 production over transition metal catalysts supported on CeO 2 . Various parameters concerning the effect of temperature (400-800˝C), steam-to-carbon (S/C) feed ratio (0.5, 1.5, 3, 6), metal entity (Fe, Co, Ni, Cu) and metal loading (15-30 wt.%) on the catalytic performance, were thoroughly studied. The optimal performance was obtained for the 20 wt.% Co/CeO 2 catalyst, achieving a H 2 yield of up to 66% at 400˝C. In addition, the Co/CeO 2 catalyst demonstrated excellent stability performance in the whole examined temperature range of 400-800˝C. In contrast, a notable stability degradation, especially at low temperatures, was observed for Ni-, Cu-, and Fe-based catalysts, ascribed mainly to carbon deposition. An extensive characterization study, involving N 2 adsorption-desorption (BET), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM/EDS), X-ray Photoelectron Spectroscopy (XPS), and Temperature Programmed Reduction (H 2 -TPR) was undertaken to gain insight into the structure-activity correlation. The excellent reforming performance of Co/CeO 2 catalysts could be attributed to their intrinsic reactivity towards ethanol reforming in combination to their high surface oxygen concentration, which hinders the deposition of carbonaceous species.

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“…The ESR catalysts mainly include supported base-metals (e.g., Ni, Co, Cu) [4][5][6][7] and supported noble metals (e.g., Pt, Rh, Ru, Pd, and Ir) [8][9][10][11] . Although noble metal-based catalysts show outstanding activity and stability in ESR, 12,13 their largescale application is limited primarily due to the high cost. Thus, development of a nonprecious catalytic system with high activity and stability would be an important step in making the ESR economically feasible.…”

Section: Introductionmentioning

confidence: 99%

Enhanced oxygen mobility and reactivity for ethanol steam reforming

Zhang

et al. 2011

AIChE Journal

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This article describes a strategy for increasing oxygen storage capacity (OSC) of ethanol steam reforming (ESR) catalysts. Sintering and carbon deposition are major defects of nickel-based catalysts for ESR; tuning oxygen mobility (OM) of CeO 2 -based supports can overcome these drawbacks and promote H 2 production. We have successfully increased OSC and OM by adding Mg into the lattice of Ni/CeO 2 to promote H 2 production in ESR. The insertion of Mg into the CeO 2 lattice efficiently promotes the reduction of Ce 4þ according to X-ray powder diffraction (XRD) and temperature-programmed reduction (TPR) analysis. Mg-modified Ni/CeO 2 catalysts have larger OSC and smaller nickel crystallite size compared with bare Ni/CeO 2 . The optimal Mg addition is 7 mol % (Ni/7MgCe) with the best OM. We also present evidence indicating that Mg addition significantly promotes ethanol conversion and H 2 production in ESR, and that Ni/7MgCe yields the best performance due to the high OM of the support. These Mg-modified catalysts also produce less carbon deposition compared with Ni/ CeO 2 , and the amount of deposited carbon decreases with increasing Mg addition. Ni/ 7MgCe has the best resistance to carbon deposition owing to the excellent OM.

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Performance of Rh/Al2O3 catalyst in the steam reforming of ethanol: H2 production for MCFC

Cited by 242 publications

References 16 publications

Challenges and strategies for optimization of glycerol steam reforming process

Challenges and strategies for optimization of glycerol steam reforming process

Hydrogen Production by Ethanol Steam Reforming (ESR) over CeO2 Supported Transition Metal (Fe, Co, Ni, Cu) Catalysts: Insight into the Structure-Activity Relationship

Enhanced oxygen mobility and reactivity for ethanol steam reforming

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