Doping effect of precious metal on the activity of CuO-CeO2 catalyst for selective oxidation of CO

Jung, Chang Ryul; Kundu, Aritra; Nam, Suk Woo; Lee, Ho In

doi:10.1016/j.apcata.2007.07.034

Cited by 35 publications

(15 citation statements)

References 36 publications

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“…Papers often present the advantages of a novel method and compare the resulting catalytic activity with the one obtained with a catalyst prepared by co-precipitation method. Table 1 gathers together several preparations of ceria-supported copper catalysts for the CO-PROX application [67][68][69][70][71][72][73][74]. This is not an exhaustive listing but it enables us to have a general idea of the main synthesis methods used and the diversity in the Cu content illustrates the difficulty to compare the catalytic activity of these materials.…”

Section: Copper-doped Ceria Catalysts: Insight Into the Preparation Mmentioning

confidence: 99%

Preferential Oxidation of Carbon Monoxide in the Presence of Hydrogen (PROX) over Noble Metals and Transition Metal Oxides: Advantages and Drawbacks

et al. 2008

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The steam reforming reaction of hydrocarbons and organic fuels, in general, is followed by a two-stage reaction of water gas shift, which allows increasing the hydrogen yield and a final purification step for CO removal to use hydrogen in an ammonia plant or a PEM fuel cell. This paper is focused on the CO Preferential Oxidation, CO PROX (or CO selective oxidation in excess hydrogen) reaction, considered as the simplest and cost effective process to achieve the less than 10 ppm CO. The objective of this paper is to review the performances of noble metals (Pt, Ru, Rh, Pd), gold and transition metal oxides catalysts in this reaction. Although the results reported are largely influenced by the experimental conditions (reactant flow composition, mass of catalyst, duration of experiment …) a comparison of advantages and drawbacks for each type of catalysts is proposed in terms of activity and selectivity as well as of CO 2 and H 2 O influences. A special attention will be paid to copper-doped ceria catalysts which appear to be very active and selective in a range of temperatures appropriate for fuel cell application. The performances, the stability and the low cost of these formulations compared to noble metal-based catalysts make them very attractive for an industrial application.

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Section: Copper-doped Ceria Catalysts: Insight Into the Preparation Mmentioning

confidence: 99%

Preferential Oxidation of Carbon Monoxide in the Presence of Hydrogen (PROX) over Noble Metals and Transition Metal Oxides: Advantages and Drawbacks

et al. 2008

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“…Iron, nickel or tin can increase the activity and selectivity of copper-ceria catalysts, although the CO oxidation occurs over copper species. 42,56,68 Doping copper-ceria with Pt can increase the activity, but no beneficial effect on the selectivity was observed when doping with Pt, Ru, Pd, Ni or Co. 69,70 Chen et al found increased activity upon adding zirconia, but only at low concentration (10 mol%). 63 Although the above reports show that copper-ceria-based catalysts can give high CO PROX activities and selectivities, important parameters for practical application are long term stability (in feeds containing H 2 O and CO 2 ), fast CO conversion and, of course, a low CO effluent concentration.…”

Section: Preferential Co Oxidation (Prox)mentioning

confidence: 99%

Sustainable selective oxidations using ceria-based materials

2010

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This Perspective covers sustainable oxidation processes using doped cerias, ceria-supported catalysts and ceria-based mixed oxides. Firstly, we consider the general properties of ceria-based catalysts. We outline the advantages of the ceria redox cycle, and explain the dynamic behaviour of these catalysts in the presence of metal additives and dopants. We then review three types of catalytic oxidation processes: preferential CO oxidation (PROX), oxidative dehydrogenation and the selective oxidations of hydrocarbons and inorganics. The preferential oxidation of CO from hydrogen-rich mixtures is interesting for fuel cell applications. Copper-ceria catalysts, where the copper species are well dispersed and interact strongly with the ceria surface, show good selectivity and activity. The oxidative dehydrogenation of small alkanes is another important potential application. To avoid mixing oxygen and hydrocarbons at high temperatures, one can run the dehydrogenation over a conventional Pt/Sn catalyst while burning the hydrogen formed using the ceria lattice oxygen. This safer redox process allows separate tuning of the dehydrogenation and hydrogen combustion stages. A combinatorial screening showed good results for ceria doped with Pb, Cr or Bi, amongst others. Finally, we also discuss the catalytic selective oxidation of various hydrocarbons, oxygenates and inorganic molecules (H 2 S, H 2 and NH 3). The goal here is either product valorisation or waste stream purification. Ceria-based materials show promise in a variety of such selective oxidations.

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“…Unfortunately, there often contains a small amount of CO in such excess hydrogen streams. Even traces of CO has a significantly negative effect on the Pt anode of PEMFC [3], thus the feed gas must be purified further. The selective oxidation of CO in excess H 2 (CO-PROX) has been thought as the most economical and effective approach to eliminate CO (below 10 ppm).…”

Section: Introductionmentioning

confidence: 99%

Catalytic performance of manganese doped CuO–CeO 2 catalysts for selective oxidation of CO in hydrogen-rich gas

Guo

Zhou

2016

Fuel

116

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Doping effect of precious metal on the activity of CuO-CeO2 catalyst for selective oxidation of CO

Cited by 35 publications

References 36 publications

Preferential Oxidation of Carbon Monoxide in the Presence of Hydrogen (PROX) over Noble Metals and Transition Metal Oxides: Advantages and Drawbacks

Preferential Oxidation of Carbon Monoxide in the Presence of Hydrogen (PROX) over Noble Metals and Transition Metal Oxides: Advantages and Drawbacks

Sustainable selective oxidations using ceria-based materials

Catalytic performance of manganese doped CuO–CeO 2 catalysts for selective oxidation of CO in hydrogen-rich gas

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