In situ photoelectron spectroscopy study of ethanol steam reforming over RhPd nanoparticles and RhPd/CeO2

Divins, Núria J.; Llorca, Jordi

doi:10.1016/j.apcata.2015.08.018

Cited by 16 publications

(13 citation statements)

References 21 publications

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“…For example, further reduction of bimetallic Rh 0.5 Pd 0.5 /CeO 2 catalyst was found under ESR at 823 K as the reaction produces H 2 and the catalyst was initially reduced at 573 K only. 30 Thus, it has been proven that the interface between Rh and the partially reduced iron oxide species Fe x O y are responsible for the efficient removal of CO during ESR. The ethanol C-C bond is cleaved by Rh and the resulting CO is spilled over to Fe x O y where it is further converted to CO 2 via WGSR.…”

Section: Correlation Of Catalytic Performance With the Rh-iron Oxide-mentioning

confidence: 99%

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The role of metal–support interaction for CO-free hydrogen from low temperature ethanol steam reforming on Rh–Fe catalysts

Choong

Chen

et al. 2017

Phys. Chem. Chem. Phys.

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Rh-Fe catalysts supported on Ca-AlO, MgO and ZrO were evaluated in ethanol steam reforming at 623 K and compared to Rh catalysts on the same supports without iron promotion. The metal-support interaction among the three entities, i.e. Rh ↔ FeO ← support (ZrO, MgO and Ca-AlO) was investigated using H-chemisorption, TEM, XPS and in situ techniques such as DRIFTS, temperature-resolved XRD and XAS. As compared to the unpromoted Rh catalysts on the same supports, the CO selectivity is depressed in the presence of iron on Rh/MgO and Rh/Ca-AlO, the latter being significantly superior. The role of metal-support interaction for CO-free hydrogen generation was unravelled using a combination of techniques. It was found that the reducibility of iron oxide determines the extent of the strong metal support interaction between Rh and FeO and the reducibility of iron oxide was affected by the support. On Rh-Fe/Ca-AlO, a good balance of the interaction between Rh, FeO and Ca-AlO prevents strong metal support interaction between Rh and FeO and thus promotes CO elimination via water-gas-shift reaction on Rh-FeO sites.

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Section: Correlation Of Catalytic Performance With the Rh-iron Oxide-mentioning

confidence: 99%

“…However, the possibility of changing the initial metallic state after reduction during the ESR cannot be ruled out. 8,30,31 This will require in situ investigation under ESR reaction conditions.…”

Section: View Article Onlinementioning

confidence: 99%

The role of metal–support interaction for CO-free hydrogen from low temperature ethanol steam reforming on Rh–Fe catalysts

Choong

Chen

et al. 2017

Phys. Chem. Chem. Phys.

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“…Apart from nickel [ 120 ], noble metal catalysts such as Rh [ 55 ], Ru [ 121 ], Pt [ 122 ], Pd [ 123 ] and Ir [ 124 ] have also been widely investigated. It was claimed that the Rh catalyst is among the most efficient catalysts for the reforming process as experimented by Cai et al [ 82 ].…”

Section: Catalyst Developmentmentioning

confidence: 99%

“…Apart from nickel [120], noble metal catalysts such as Rh [55], Ru [121], Pt [122], Pd [123] and Ir [124] have also been widely investigated. It was claimed that the Rh catalyst is…”

Section: Noble Metals and Other Catalystsmentioning

confidence: 99%

Catalytic reforming of oxygenated hydrocarbons for the hydrogen production: an outlook

Azizan

Aqsha

Ameen

et al. 2020

Biomass Conv. Bioref.

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The catalytic steam reforming of oxygenated hydrocarbons has been holding an interest in scientific societies for the past two decades. The hydrogen production from steam reforming of glycerol, ethanol and other oxygenates such as ethylene glycol and propylene glycol are more suitable choice not just because it can be produced from renewable sources, but it also helps to decrease the transportation fuel price and making it more competitive. In addition, hydrogen itself is a green fuel for the transportation sector. The studies on the production of hydrogen from various reforming technologies revealed a remarkable impact on the environmental and socio-economic issues. Researchers became more focused on glycerol steam reforming (GSR), ethanol steam reforming (ESR) and other oxygenates to investigate the catalyst suitability, their kinetics and challenges for the sustainability of the oil and gas production. In the present work, the authors critically addressed the challenges and strategies for hydrogen production via GSR, ESR and other oxygenates reforming process. This review covers extensively thermodynamic parametric analysis, catalysts developments, kinetics and advancement in the operational process for glycerol, ethanol and few other oxygenates. This detailed investigation only highlights the steam reforming process (SRP) of these oxygenates at the laboratory experimental stage. It was found that from this review, there are many technical issues, which lead to economic challenges. The issues are yet to be addressed and thus, these particular applications require faster accelerations at the pilot scale, taking into the consideration of the current pandemic and economic issues, for a safer and greener environment. Graphical abstract

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“…The characterization of the catalysts has been reported in detail previously, both for the potassium-doped Co hydrotalcite [29,30] and for the RhPd/CeO 2 [32,34,35]. In this work we have used scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM) to study the catalysts before and after the reforming process to check for sintering phenomena and carbon deposition.…”

Section: Catalyst Samplesmentioning

confidence: 99%

Finding a suitable catalyst for on-board ethanol reforming using exhaust heat from an internal combustion engine

Casanovas

Divins

Rejas

et al. 2017

International Journal of Hydrogen Energy

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Ethanol steam reforming with pure ethanol and commercial bioethanol (S/C = 3) was carried out inside the housing of the exhaust gas pipe of a gasoline internal combustion engine (ICE) by using exhaust heat (610–620 °C). Various catalytic honeycombs loaded with potassium-promoted cobalt hydrotalcite and with ceria-based rhodium–palladium catalysts were tested under different reactant loads. The hydrogen yield obtained over the cobalt-based catalytic honeycomb at low load (F/W < 25 mLliq·gcat-1·h-1, GHSV = 4·102 h-1) was remarkably high, whereas that obtained over the noble metal-based catalytic honeycombs was much superior at high loads (F/W = 25–150 mLliq·gcat-1·h-1, GHSV = 4·102–2.4·103 h-1). At higher reactant loads the overall hydrogen production was limited by heat transfer from the exhaust heat to the reformer inside the housing of the exhaust gas pipe of the ICE. Extensive carbon deposition occurred over the cobalt-based honeycomb, making its use impractical. In contrast, stability runs (>200 h) at high load (F/W = 150 mLliq·gcat-1·h-1, GHSV = 2.4·103 h-1) showed that promotion of the ceria-supported noble metal catalyst with alumina and zirconia is a key element for practical application using commercial bioethanol. HRTEM analysis of post mortem honeycombs loaded with RhPd/Ce0.5Zr0.5O2–Al2O3 showed no carbon formation and no metal agglomeration.Postprint (author's final draft

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In situ photoelectron spectroscopy study of ethanol steam reforming over RhPd nanoparticles and RhPd/CeO2

Cited by 16 publications

References 21 publications

The role of metal–support interaction for CO-free hydrogen from low temperature ethanol steam reforming on Rh–Fe catalysts

The role of metal–support interaction for CO-free hydrogen from low temperature ethanol steam reforming on Rh–Fe catalysts

Catalytic reforming of oxygenated hydrocarbons for the hydrogen production: an outlook

Finding a suitable catalyst for on-board ethanol reforming using exhaust heat from an internal combustion engine

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