Influence of structural parameters on the reaction of low temperature ethanol steam reforming over Pt/Al2O3 catalysts

Kourtelesis, Marios; Panagiotopoulou, Paraskevi; Verykios, Xenophon E.

doi:10.1016/j.cattod.2014.12.035

Cited by 46 publications

(25 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…H 2 , CO and CO 2 ) were the main products in the outlet reaction stream in comparison with CH 4 , C 2 H 6 and C 2 H 4 production. Hence, under OCC (no current application), the catalytic ethanol reforming reaction occurred on both Pt catalystelectrodes which were symmetrically placed in contact with the reaction mixture [27] via…”

Section: Resultsmentioning

confidence: 99%

Direct production of flexible H2/CO synthesis gas in a solid electrolyte membrane reactor

Lucas-Consuegra

Gutiérrez-Guerra

Endrino

et al. 2015

J Solid State Electrochem

View full text Add to dashboard Cite

The development of novel configurations for the production of synthesis gas (syn-gas) of flexible H 2 /CO ratio is of great importance to reduce the cost for the synthesis of synfuels and high-value chemicals. In this work, we propose a radically novel approach to the direct production of syn-gas with flexible H 2 /CO ratio based on the solid electrolyte membrane reactor (SEMR). For that purpose, a single-chamber solid electrolyte membrane reactor based on yttria-stabilized zirconia (YSZ) has been developed (Pt/YSZ/Pt), where both active Pt catalysts-electrodes were exposed to the same reaction atmosphere (C 2 H 5 OH/H 2 O=0.7 %/2 %). The application of different polarizations at temperature range (600-700°C) allows to control the H 2 /CO ratio of the obtained syn-gas, i.e., the ratio was varied between 1.5 and 12 under polarization conditions. Unlike conventional catalytic partial oxidation processes, the H 2 /CO adjustment was managed without the requirement of external O 2 feeding to the reactor. An increase in the applied current or potential caused the H 2 /CO ratio to increase vs. the open-circuit conditions where ethanol reforming occurred on the Pt catalyst-electrodes which is due to an increase in the rate of the electro-catalytic processes. On the other hand, a decrease in the H 2 /CO ratio at a fixed potential was achieved at higher temperatures due to the further reaction of the produced H 2 with the rest of the species present in the gas phase, leading to a decrease in the faradaic efficiency. The proposed configuration may be of great interest especially for biorefinery applications where H 2 , syn-gas and electricity may be produced from bioethanol.

show abstract

Section: Resultsmentioning

confidence: 99%

Direct production of flexible H2/CO synthesis gas in a solid electrolyte membrane reactor

Lucas-Consuegra

Gutiérrez-Guerra

Endrino

et al. 2015

J Solid State Electrochem

View full text Add to dashboard Cite

show abstract

“…V. Palma et al studied a series of Pt/CeO 2 catalysts, which found that 5% Pt/CeO 2 catalyst is extremely effective for promoting LT‐ESR activity and also active for the WGS reaction; however, carbon deposition was still observed. P. Panagiotopoulou group revealed that the key step of Pt/Al 2 O 3 catalyst for LT‐ESR is platinum terrace sites of multiple Pt atoms. Chen L et al used Rh/ZrO 2 catalyst for LT‐ESR for H 2 production and revealed that the CO selectivity increased with increased addition of iron oxide.…”

Section: Introductionmentioning

confidence: 99%

A high-performance CeO₂ @Pt-Beta yolk-shell catalyst used in low-temperature ethanol steam reforming for high-purity hydrogen production

et al. 2019

View full text Add to dashboard Cite

Summary A novel Pt‐based Beta encapsulated CeO2 yolk‐shell catalyst was successfully synthesized via a RF layer in the synthetic process. The CeO2@Pt‐Beta catalyst showed high catalytic activity and stability toward the LT‐ESR with respect to the reference Pt‐Beta, CeO2‐Pt‐Beta, which benefited from the special yolk‐shell structure and the synergistic effect between the CeO2 movable core and Pt metal. The confinement effect of the yolk‐shell architecture contributed to the high dispersion of Pt nanoparticles as well as to the accumulation of reactant molecules in the enclosed void space, which ensured the reactants reacted with CeO2 and Pt to achieve a complete reaction.

show abstract

“…Ethanol steam reforming remains a classical prototype conversion reaction that is important for the efficient transformation of oxygenates into H 2 , a process with great promise for fuel conversion for both large applications and small devices [1][2][3]. Numerous strategies have been adopted to screen for the best catalysts for this reaction, with careful consideration of element selection [4][5][6][7][8][9][10][11][12][13], sizes of metals [14][15][16][17], oxide support composition/architecture [18][19][20][21][22][23][24][25][26][27][28] and reaction conditions [29][30][31][32]. However, numerous challenges remain as obstacles to effective deployment in technical applications, some of which can only be mitigated through an improved understanding of the fundamental nature of the active catalyst and the reaction mechanism [1,3].…”

Section: Introductionmentioning

confidence: 99%

Elucidating the interaction between Ni and CeOx in ethanol steam reforming catalysts: A perspective of recent studies over model and powder systems

Liu

Senanayake

Rodríguez

2016

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

Bulk metallic nickel is a poor catalyst for the reforming of hydrogenates being deactivated by the deposition of coke. In contrast, Ni-ceria is an active system for the catalytic extraction of H 2 from the ethanol steam reforming reaction (ESR, C 2 H 5 OH + 3H 2 O ↔ 2CO 2 + 6H 2). Numerous studies, with model (well-defined crystal surfaces) and technical (high surface area powders) catalysts, have been devoted to understand the fundamental role of each catalyst component, the performance of adjacent sites in the metal-oxide interface, and the complex mechanistic steps that convert two oxygenated reactants (ethanol and H 2 O) into H 2. The size and low loading of Ni on ceria facilitate metal-oxide support interactions that probably enhance the reactivity of the system. To establish the precise role of both Ni and Ce is challenging. However it is clear that both Ni and Ce are associated with the dissociation of H 2 O (OH+H), while ceria readily adsorbs and partially dissociates ethanol (i.e. ethoxy formation). The most difficult step of CC bond dissociation likely occurs only on Ni or at the NiCe interface. H 2 O and OH remain as important agents for the prevention of excess C build up during the C-H/C-C dissociation process. Often, deactivation upon C build up, is a direct result of Ni sintering and decoupling of the NiCe interactions. One strategy to maintain good activity and stability is to protect the NiCe interaction, and this can be achieved through the use of solid solutions (Ce 1-x Ni x O 2-y) or by employing stabilizing agents such as W (Ni x W y Ce z O 2). In this article, we present and discuss the most recent work for the ESR reaction and show the important role of ceria which participates directly in the reaction and also enhances catalytic activity through metal-support interactions.

show abstract

Influence of structural parameters on the reaction of low temperature ethanol steam reforming over Pt/Al2O3 catalysts

Cited by 46 publications

References 67 publications

Direct production of flexible H2/CO synthesis gas in a solid electrolyte membrane reactor

Direct production of flexible H2/CO synthesis gas in a solid electrolyte membrane reactor

A high-performance CeO₂ @Pt-Beta yolk-shell catalyst used in low-temperature ethanol steam reforming for high-purity hydrogen production

Elucidating the interaction between Ni and CeOx in ethanol steam reforming catalysts: A perspective of recent studies over model and powder systems

Contact Info

Product

Resources

About

Influence of structural parameters on the reaction of low temperature ethanol steam reforming over Pt/Al2O3 catalysts

Cited by 46 publications

References 67 publications

Direct production of flexible H2/CO synthesis gas in a solid electrolyte membrane reactor

Direct production of flexible H2/CO synthesis gas in a solid electrolyte membrane reactor

A high-performance CeO2 @Pt-Beta yolk-shell catalyst used in low-temperature ethanol steam reforming for high-purity hydrogen production

Elucidating the interaction between Ni and CeOx in ethanol steam reforming catalysts: A perspective of recent studies over model and powder systems

Contact Info

Product

Resources

About

A high-performance CeO₂ @Pt-Beta yolk-shell catalyst used in low-temperature ethanol steam reforming for high-purity hydrogen production