Hydrogen production by iso-octane steam reforming over Cu catalysts supported on rare earth oxides (REOs)

Al-Musa, A.; Al-Saleh, Mohammed; Ioakeimidis, Zisis; Ouzounidou, Martha; Yentekakis, I.V.; Konsolakis, Michalis; Marnellos, George

doi:10.1016/j.ijhydene.2013.11.013

Cited by 40 publications

(19 citation statements)

References 53 publications

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“…The present results are in agreement with those obtained over Cu-and Co-based catalysts during ethanol [90] or iso-octane [48,93] steam reforming. Highly reducible Cu-based catalysts are almost inactive for ESR, leading mainly to ethanol dehydrogenation [90].…”

Section: Discussionsupporting

confidence: 91%

“…The spectrum of the Cu/CeO 2 sample is characterized by a Cu 2p 3/2 band at 933.8 eV and shake-up satellites at ca. 944.0 eV, typical characteristics of Cu 2+ species in CuO-like phase [20,48,[66][67][68][69][70]. The above assignments are in line with the XRD findings, which revealed the formation of the corresponding metal oxides in M/CeO 2 samples (Table 2).…”

Section: Surface Characterization (Xps Analysis)supporting

confidence: 84%

“…In the Cu/CeO 2 sample the overlapping peaks at 100-300˝C temperature interval are assigned to Cu oxide species reduction along with the surface oxygen reduction [48][49][50][51][52]. Specifically, the peak at 133˝C is attributed to the reduction of Cu ions in close proximity to CeO 2 , while, the features at 215˝C and 267˝C are assigned to Cu entities not closely associated with ceria [52].…”

Section: Reducibility Studies (H 2 -Tpr)mentioning

confidence: 96%

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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: 91%

Section: Surface Characterization (Xps Analysis)supporting

confidence: 84%

Section: Reducibility Studies (H 2 -Tpr)mentioning

confidence: 96%

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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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“…The phenomenon could be caused by agglomeration of bulk Cu particles that were dispersed on the Ni surface, therefore inhibiting the reducibility of Ni. This indicated that the methanation reaction (reactions 10-12) should take preference at higher Cu loadings of 0.5 molar [54]. For 18 wt.…”

Section: Effect Of Ni-cu Loading On γ-Al2o3 Supportmentioning

confidence: 93%

Low-Temperature Catalytic Performance of Ni-Cu/Al2O3 Catalysts for Gasoline Reforming to Produce Hydrogen Applied in Spark Ignition Engines

2016

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Abstract:The performance of Ni-Cu/Al 2 O 3 catalysts for steam reforming (SR) of gasoline to produce a hydrogen-rich gas mixture applied in a spark ignition (SI) engine was investigated at relatively low temperature. The structural and morphological features and catalysis activity were observed by X-ray diffractometry (XRD), scanning electron microscopy (SEM), and temperature programmed reduction (TPR). The results showed that the addition of copper improved the dispersion of nickel and therefore facilitated the reduction of Ni at low temperature. The highest hydrogen selectivity of 70.6% is observed over the Ni-Cu/Al 2 O 3 catalysts at a steam/carbon ratio of 0.9. With Cu promotion, a gasoline conversion of 42.6% can be achieved at 550˝C, while with both Mo and Ce promotion, the gasoline conversions were 31.7% and 28.3%, respectively, higher than with the conventional Ni catalyst. On the other hand, initial durability testing showed that the conversion of gasoline over Ni-Cu/Al 2 O 3 catalysts slightly decreased after 30 h reaction time.

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“…NaOH, ferrosilicon and H 2 O are added to a sealed vessel and as the hydroxide dissolves and heats to 200 o F, H 2 and steam are produced. Many other methods are also used, steam reforming, CO 2 sequestration, partial oxidation, plasma reforming, coal, electrolysis, photobiological, sulphur-iodine, fermentative production, enzymatic production, renewable hydrogen and lastly photocatalysis (Guo and Chen 2011;Musa et al using two different semiconductor materials and a reversible donor-acceptor pair is one of the possible forms of "manmade photosynthesis" and is known as the Z-scheme system, which was described previously and can be seen in Figure 13. The development of new semiconductor materials aids in the efficiency of Z-scheme H 2 O splitting by reducing the number of back reactions.…”

Section: Photoreactors For Water Splittingmentioning

confidence: 99%

Photocatalytic Splitting of Water

Skillen

McCullagh

Adams

2014

Environmental Photochemistry Part III

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The final publication is available at Springer via http://dx.doi.org/10.1007/698_2014_261 AbstractThe use of photocatalysis for the photosplitting of water to generate hydrogen and oxygen has gained interest as a method for the conversion and storage of solar energy. The application of photocatalysis through catalyst engineering, mechanistic studies and photoreactor development has highlighted the potential of this technology, with the number of publications significantly increasing in the past few decades. In 1972 Fujishima and Honda described a photoelectrochemcial system capable of generating H 2 and O 2 using thin film TiO 2 . Since this publication, a diverse range of catalysts and platforms have been deployed, along with a varying range of photoreactors coupled with photoelectrochemical and photovoltaic technology. This chapter aims to provide a comprehensive overview of photocatalytic technology applied to overall H 2 O splitting. An insight into the electronic and geometric structure of catalysts is given based upon the one and two step photocatalyst systems.One step photocatalysts are discussed based upon their d 0 and d 10 electron configuration and core metal ion including transition metal oxides, typical metal oxides and metal nitrides. The two step approach, referred to as the Z-scheme, is discussed as an alternative approach to the traditional one step mechanism and the potential of the system utilise visible and solar irradiation. In addition to this the mechanistic procedure of H 2 O splitting is reviewed to provide the reader with a detailed understanding of the process. Finally, the development of photoreactors and reactor properties are discussed with a view towards the photoelectrochemical splitting of H 2 O.

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Hydrogen production by iso-octane steam reforming over Cu catalysts supported on rare earth oxides (REOs)

Cited by 40 publications

References 53 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

Low-Temperature Catalytic Performance of Ni-Cu/Al2O3 Catalysts for Gasoline Reforming to Produce Hydrogen Applied in Spark Ignition Engines

Photocatalytic Splitting of Water

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