Steam reforming of methanol over Cu/CeO2/ZrO2 catalysts

Oguchi, Hisayuki; Nishiguchi, Toshiya; Matsumoto, Toshiro; Kanai, Hiroyoshi; Utani, Kazunori; Matsumura, Yukihiko; Imamura, Seiichiro

doi:10.1016/j.apcata.2004.11.014

Cited by 122 publications

(69 citation statements)

References 25 publications

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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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“…Liu et al 19 have reported an optimal composition of 26.9 wt.% Cu substantially lower than the optimum (80 wt.%) proposed by Oguchia et al. 21 We have studied supported catalysts with a lower loading (around 5 wt.%Cu) which have turned out to be very active in the methanol steam reforming. 22 In this work, the preparation, characterization and catalytic activity of Cu supported CeO 2 are discussed.…”

Section: Introductionmentioning

confidence: 99%

Methanol steam reforming over Cu/CeO2 catalysts: influence of zinc addition

Tonelli¹,

Gorriz²,

Arrúa³

et al. 2011

Quím. Nova

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Recebido em 20/10/10; aceito em 17/3/11; publicado na web em 5/5/11Methanol steam reforming reaction was studied over Cu(5 wt.%)/CeO 2 with and without the presence of Zn. The Zn addition decreased the Cu +2 reducibility and increased the oxygen mobility of ceria. The main products were CO 2 and H 2 with small amount of CO. Selectivity to CO decreased with the Zn addition and it was lower at lower reaction temperatures and lower space velocities. At 230 ºC and W/F MeOH = 648 g min mol -1 selectivities to H 2 and to CO 2 were 100% on Zn/Cu/Ce. The catalytic results indicated that CO was mainly a secondary product formed from reverse water gas shift reaction.

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“…Most of the tests are performed at a net oxidizing condition and the S/M ratio varies from 0.75 to 3.1. The direct coprecipitation synthesized CuO loaded over CuO/CeO2/ZrO2 mixed oxide have been shown to exhibit a high methanol conversion of 80% but with a low GHSV of 16,380 h -1 [23]. The time on stream activity data carried out for just 5 h have shown the rate of hydrogen production over this catalyst to suffer a little deactivation.…”

Section: Discussionmentioning

confidence: 97%

“…(3)) [6]. 1 The CeO2eZrO2 mixed oxide supports can therefore have several beneficial effects on MSR catalysts like improvement of metal dispersion, enhancement of long term stability and, more importantly, resistance against carbon deposition [17,20,23,24]. However, there are very limited reports in the literature emphasizing the investigations on copper based ceria-zirconia systems for MSR activity [7,11,23,25e30].…”

Section: Introductionmentioning

confidence: 99%

“…The decrease in activity during long term tests is a general observation for this kind of catalytic systems [7,23,25,29]. To investigate in detail the possibility of activity recovery and the catalyst reuse after an intermediate oxidation step, we carried out regeneration tests as described in the experimental section.…”

Section: Msr Activity Of Aged and Regenerated Catalystsmentioning

confidence: 99%

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