Highly active copper/ceria catalysts for steam reforming of methanol

Liu, Yanyong; Hayakawa, T.; Suzuki, Kunio; Hamakawa, Satoshi; Tsunoda, Tetsuto; Ishii, Tomoko; Kumagai, Mikio

doi:10.1016/s0926-860x(01)00733-5

Cited by 197 publications

(116 citation statements)

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“…Ni was chosen for comparison to Pd because it exhibits comparable catalytic activity for oxidation reactions under conditions where it remains reduced. While Cu-ceria catalysts are active for the water-gas-shift reaction and for reforming of alcohols, [22][23][24] Cu is a relatively poor oxidation catalyst. We therefore chose to use a higher loading for Cu relative to the other metals.…”

Section: Resultsmentioning

confidence: 99%

An Examination of SOFC Anode Functional Layers Based on Ceria in YSZ

Gross

Vohs

Gorte

2007

J. Electrochem. Soc.

109

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The properties of solid oxide fuel cell ͑SOFC͒ anode functional layers prepared by impregnation of ceria and catalytic metals into porous yttria-stabilized zirconia ͑YSZ͒ have been examined for operation at 973 K. By varying the thickness of the functional layer, the conductivity of the ceria-YSZ composite was determined to be only 0.015-0.02 S/cm. The initial performance of anodes made with ceria loadings of 40 or 60 wt % were similar but the anodes with lower loadings lost conductivity above 1073 K due to sintering of the ceria. The addition of dopant levels of catalytic metals was found to be critical. The addition of 1 wt % Pd or Ni decreased the anode impedances in humidified H 2 dramatically, while the improvement with 5 wt % Cu was significant but more modest. Pd doping also decreased the anode impedance in dry CH 4 much more than did Cu doping; however, addition of either Pd or Cu led to similar improvements for operation in n-butane. Based on these results, suggestions are made for ways to improve SOFC anode functional layers.

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Section: Resultsmentioning

confidence: 99%

An Examination of SOFC Anode Functional Layers Based on Ceria in YSZ

Gross

Vohs

Gorte

2007

J. Electrochem. Soc.

109

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“…Low temperature steam reforming mainly focuses on Cu-based [3][4][5][6][7][8][9][10][11][12][13][14][15] and Pd-based [16][17][18][19][20][21][22] catalysts. For Cu-based catalysts, the most extensively studied catalysts are Cu/ZnO and Cu/ZnO/Al 2 O 3 [7,9,10], etc.…”

Section: Introductionmentioning

confidence: 99%

“…ZnO is well-known to improve the dispersion of Cu and the reducibility of CuO [5,6]. In addition, the efficiency of Cubased catalysts can be promoted by ZrO 2 , CeO 2 [4,[12][13][14]. ZrO 2 can promote the SRM reaction and slightly reduce the concentration of CO [13].…”

Section: Introductionmentioning

confidence: 99%

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High-temperature steam reforming of methanol over ZnO–Al2O3 catalysts

Yang

Chen

2011

Applied Catalysis B: Environmental

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“…The catalyst deactivation is mainly associated with the thermal sintering of small copper particles leading to a reduction of active surface area [53e55], the change in the oxidation state of copper from its oxidized form (Cu 2þ ) to the metallic form (Cu 0 ) [4], the variation in Cu þ /Cu 0 molar ratio [11,26e28] and the deposition of coke on the catalyst surface [56,57]. The continuous activity decrease in our long time on stream tests can be correlated to the formation of the reduced copper phases, namely Cu 0 and Cu2O.…”

Section: Discussionmentioning

confidence: 99%