Water gas shift activity of noble metals supported on ceria‐zirconia oxides

Radhakrishnan, Rakesh; Willigan, Rhonda; Dardas, Zissis; Vanderspurt, Thomas H.

doi:10.1002/aic.10785

Cited by 57 publications

(53 citation statements)

References 14 publications

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“…For example, ceria reducibility is reported to be enhanced by decreasing the crystallite size [17,18] or doping with various other metal cations, such as ?3 rareearth ions (e.g., La ?3 , Sm ?3 ) [19], Zr ?4 [20,21], and Ti ?4 [22,23]. While some of these ceria-based catalysts have shown better performance following ceria modification, further improvements are clearly needed, especially for the WGS reaction.…”

Section: Introductionmentioning

confidence: 99%

The Water–Gas-Shift Reaction on Pd/Ceria–Praseodymia: The Effect of Redox Thermodynamics

et al. 2009

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Reaction rates for the water-gas-shift (WGS) reaction were measured on catalysts with 1-wt% Pd supported on CeO 2 , Ce 0.5 Pr 0.5 O 2-x and PrO x in order to determine whether the weakly bound oxygen associated with Pr could enhance reaction rates. However, differential rates in 25 Torr of both CO and H 2 O showed that the activity of Pr-containing catalysts were much lower. Measurements of the oxygen content of these samples after reduction in dry H 2 at 873 K, after reoxidation in steam at 873 K, and following exposure of the catalysts to WGS conditions at 873 K demonstrate that ceria is easily reoxidized by steam and remains oxidized under WGS conditions, while the loosely bound oxygen associated with praseodymia or ceria-praseodymia is lost under WGS conditions and cannot be restored by oxidation in steam. These results can be understood by comparing the equilibrium redox properties of the support materials to the typical P(O 2 ) experienced under WGS conditions.

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Section: Introductionmentioning

confidence: 99%

The Water–Gas-Shift Reaction on Pd/Ceria–Praseodymia: The Effect of Redox Thermodynamics

et al. 2009

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“…In contrast to the authors of the papers discussed up to now, Radhakrishnan et al [16] found 3.33 wt.% Au/Ce 0.58 Zr 0.42 O 2 catalyst merely active in WGS reaction. This catalyst is much less active than any other noble metal catalyst (Pt, Rh, Ru, Pd, Ir) supported on the same oxide support.…”

Section: Ceria-zirconia Supported Gold Catalysts For Low-temperature mentioning

confidence: 44%

“…Such unique properties of ceria-zirconia systems seem to make them ideally suited for an application as supports to gold catalysts. Surprisingly, only a few papers concerning Au/Ce x Zr 1-x O 2 catalysts [7,[9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], tested mainly in the water-gas shift reaction [9][10][11][12][13][14][15][16] and low-temperature CO oxidation [10,[17][18][19][20][21][22][23] have been published so far. In this paper the most important achievements and conclusions coming from these contributions have been reviewed.…”

Section: Introductionmentioning

confidence: 99%

Ceria-zirconia supported gold catalysts

Rynkowski

Dobrosz-Gómez

2009

Annales UMCS, Chemistry

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This paper presents the most important achievements and conclusions coming from the contributions concerning ceria-zirconia supported Au catalysts for low temperature water gas-shift reaction and low-temperature CO oxidation. The usefulness of CeO 2 -ZrO 2 mixed oxides as supports for Au nanoparticles has been reviewed, mainly from the point of view of their contribution to those reactions. A special attention was paid to the active sites of CO oxidation and WGS reaction over Au/ceria-zirconia systems. Some aspects of the reactions mechanisms are also discussed. Ceriazirconia supported gold catalysts appear to be very promising systems, which have a potential to create a new quality in the catalysis of WGS reaction. Ceria-zirconia mixed oxides also seem to be very promising supports for Au nanoparticles in CO oxidation. They could find a practical application in ambient conditions, especially in air purification systems and a breathing apparatus. It is possible that gold could be usefully incorporated into automobile catalysts, considering that the price of other noble metals is rising rapidly. Their use in this application will, however, require demonstration of adequate stability at operating temperatures.

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“…Radhakrishnan et al [56] tested various noble metals and found Pt to be more active, selective, and stable than Pd, Ru, Rh, Ir, or Au. Kolb et al [28] tested various bimetallic catalysts such as Pt/CeO 2 /Al 2 O 3 , Pt/Rh/CeO 2 /Al 2 O 3 , Pt/Pd/CeO 2 /Al 2 O 3 , and Pt/Ru/Al 2 O 3 in a microreactor in the temperature range of 290-340 ı C and found Pt/CeO 2 /Al 2 O 3 to be the most active and selective.…”

Section: Water-gas Shift Reactionmentioning

confidence: 97%

Microstructured Reactors for Hydrogen Production from Ethanol

Peela

Kunzru

2015

Springer Tracts in Mechanical Engineering

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The continuously increasing demand for clean and renewable energy warrants the development of renewable, nonpolluting energy resources. Hydrogen is emerging as a natural choice as a more secure and cleaner energy carrier. Fuel cells can be used to produce clean energy from hydrogen, particularly for portable applications. Hydrogen can be produced from a variety of fossil fuel sources, but to decrease the dependence on fossil fuels, hydrogen has to be produced from a renewable source. Hydrogen production from steam reforming of ethanol (a renewable fuel) has emerged as a promising alternative in recent years. For conducting this reaction on board a vehicle, a compact reactor system is required. A microchannel reactor is more efficient and attractive for this purpose, because of the high surface to volume ratio, resulting in high heat and mass transfer rates.The reactions involved in producing CO-free hydrogen from ethanol include steam reforming of ethanol, water-gas shift reaction, and preferential oxidation of carbon monoxide. This chapter discusses the steps involved in the development of a microfuel processor for producing hydrogen from ethanol that include fabrication of the microchannels on the metal substrate, coating of the catalyst and support on the microchannels, assembly of the microchannel reactor, optimization of the catalysts for the three reactions, and, finally, heat integration of the different processes to maximize the efficiency of the fuel processor.

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Water gas shift activity of noble metals supported on ceria‐zirconia oxides

Cited by 57 publications

References 14 publications

The Water–Gas-Shift Reaction on Pd/Ceria–Praseodymia: The Effect of Redox Thermodynamics

The Water–Gas-Shift Reaction on Pd/Ceria–Praseodymia: The Effect of Redox Thermodynamics

Ceria-zirconia supported gold catalysts

Microstructured Reactors for Hydrogen Production from Ethanol

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