The effect of accessible oxygen over Co3O4–CeO2 catalysts on the steam reforming of ethanol

Yu, Shen-Wei; Huang, Hsin-Hua; Tang, Chih‐Wei; Wang, Chen-Bin

doi:10.1016/j.ijhydene.2014.07.139

Cited by 47 publications

(32 citation statements)

References 73 publications

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“…The latter, could be possibly related to the strong metal-support interactions, maintaining the Co species in an oxidized state (Co δ`s pecies). This factor could be considered responsible for the adequate ESR performance of Co/CeO 2 catalysts, in agreement with relevant literature studies [42][43][44][88][89][90][91].…”

Section: Discussionsupporting

confidence: 89%

“…In contrast, Co/SiO 2 catalysts demonstrated superior reforming performance, despite their limited reducibility at low temperatures due to the strong metal-support interactions [90]. Along the same lines, it has been demonstrated that the oxygen storage capacity of the support can greatly affect the reforming performance of Co-based catalysts by promoting the gasification of carbon deposits [88,91]. To this end, the superior ESR performance of Co/CeO 2 catalysts as compared to ZrO 2 -or Al 2 O 3 -based samples has been ascribed to the abundance of redox sites on the catalyst surface [36,40,41].…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

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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“…Calculations using Scherrer's method for the (111) reflection of CeO 2 show that the ceria crystallite size became smaller, 17.1 nm for 2% Co/ ceria, and 10.7 nm for the 10% Co/ceria catalyst (Table 1). While the high temperature hydrogen treatments (reduction) play an important role in the disruption phenomenon, the oxidation step did not cause such a dramatic effect: for the 10% Co/ceria catalyst, the ceria particle size decreased from 27.6 to 16.9 nm upon oxidation of the calcined Co-containing sample at 673 K. In agreement with a literature observation, 63 Co-oxides and metallic Co particles are difficult to distinguish in HRTEM from the CeO 2 particles, due to the low contrast and the above mentioned significant dissolution. For the Rh-Co bimetallic cases, a similar broadening of the ceria reflections takes place, though to a lesser extent than for Co/ceria samples ( Fig.…”

Section: Characterization By Powder X-ray Diffraction (Xrd) and Transsupporting

confidence: 90%

Probing the interaction of Rh, Co and bimetallic Rh–Co nanoparticles with the CeO₂ support: catalytic materials for alternative energy generation

Varga

Pusztai

Óvári³

et al. 2015

Phys. Chem. Chem. Phys.

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The interaction of CeO 2 -supported Rh, Co and bimetallic Rh-Co nanoparticles, which are active catalysts in hydrogen production via steam reforming of ethanol, a process related to renewable energy generation, was studied by X-ray diffraction (XRD), high resolution electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and low energy ion scattering (LEIS). Furthermore, diffuse reflectance infrared spectroscopy (DRIFTS) of adsorbed CO as a probe molecule was used to characterize the morphology of metal particles. At small loadings (0.1%), Rh is in a much dispersed state on ceria, while at higher contents (1-5%), Rh forms 2-8 nm particles. Between 473-673 K pronounced oxygen transfer from ceria to Rh is observed and at 773 K significant agglomeration of Rh occurs. On reduced ceria, XPS indicates a possible electron transfer from Rh to ceria. The formation of smaller ceria crystallites upon loading with Co was concluded from XRD and HRTEM; for 10% Co, the CeO 2 particle size decreased from 27.6 to 10.7 nm. A strong dissolution of Co into ceria and a certain extent of encapsulation by ceria were deduced by XRD, XPS and LEIS. In the bimetallic system, the presence of Rh enhances the reduction of cobalt and ceria.During thermal treatments, reoxidation of Co occurs, and Rh agglomeration as well as oxygen migration from ceria to Rh are hindered in the presence of cobalt.

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“…illustrates the % yield of the produced gases from the SRF with CeCoO x catalysts with various Ce/Co contents in the mixed oxides. In general, Co has been found to be an effective catalyst for H 2 production from the SRRs of alcohol, where the Co site was proposed to be the active site for C–C scissions , . As seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen Production by Steam Reforming of Fusel Oil Using a CeCoO_x Mixed‐Oxide Catalyst

et al. 2019

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Various CeCoOx mixed‐oxide catalysts with different Ce/Co ratios were prepared by surfactant‐assisted template precipitation of CeO2 and Ce3O4. The obtained catalysts were characterized by X‐ray diffraction, X‐ray photoelectron spectra, hydrogen temperature‐programmed reduction, nitrogen physisorption, and transmission electron microscopy. In general, the mixed‐oxide CeCoOx catalysts showed well‐dispersed CeO2 and Co3O4 and good catalytic characteristics including a high specific surface area and porous structure. The effectiveness of the prepared catalysts on the hydrogen (H2) production from steam reforming of fusel oil was studied in a packed‐bed reactor. Co played an important role in C–C scission to break down the large C2–5 molecules into smaller species resulting in H2 formation. Ce could provide supplementary active oxygen to prevent coke formation on Co, resulting in a more stable activity of the mixed‐oxide catalyst throughout the reaction course.

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The effect of accessible oxygen over Co3O4–CeO2 catalysts on the steam reforming of ethanol

Cited by 47 publications

References 73 publications

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

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

Probing the interaction of Rh, Co and bimetallic Rh–Co nanoparticles with the CeO₂ support: catalytic materials for alternative energy generation

Hydrogen Production by Steam Reforming of Fusel Oil Using a CeCoO_x Mixed‐Oxide Catalyst

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The effect of accessible oxygen over Co3O4–CeO2 catalysts on the steam reforming of ethanol

Cited by 47 publications

References 73 publications

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

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

Probing the interaction of Rh, Co and bimetallic Rh–Co nanoparticles with the CeO2 support: catalytic materials for alternative energy generation

Hydrogen Production by Steam Reforming of Fusel Oil Using a CeCoOx Mixed‐Oxide Catalyst

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Product

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Probing the interaction of Rh, Co and bimetallic Rh–Co nanoparticles with the CeO₂ support: catalytic materials for alternative energy generation

Hydrogen Production by Steam Reforming of Fusel Oil Using a CeCoO_x Mixed‐Oxide Catalyst