Characterization and tests of planar Co3O4 model catalysts prepared by chemical vapor deposition

Bahlawane, Naoufal; Rivera, Edgar Fischer; Kohse‐Höinghaus, Katharina; Brechling, Armin; Kleineberg, Ulf

doi:10.1016/j.apcatb.2004.06.001

Cited by 125 publications

(67 citation statements)

References 45 publications

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“…A reduction of Co oxide upon exposure to an alcohol (ethanol in this case) was observed by Bahlawane et al under ambient conditions as well. [51] In summary, complete dehydrogenation is also detected after pretreatment with small amounts of oxygen. Carbon monoxide formation, however, is shifted to slightly lower temperatures as compared to metallic Co particles.…”

Section: Carbon Monoxide Dissociation On Monometallic Comentioning

confidence: 92%

UHV Studies of Methanol Decomposition on Mono‐ and Bimetallic CoPd Nanoparticles Supported on Thin Alumina Films

et al. 2008

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Bimetallic nanoparticles often turn out to be superior to the corresponding monometallic systems with respect to their catalytic properties. To study such effects for the methanol decomposition reaction, model catalysts were prepared by physical vapor deposition of Pd and Co under ultrahigh-vacuum (UHV) conditions. Monometallic Pd and Co particles as well as CoPd core-shell particles were generated on an epitaxial alumina film grown on NiAl(110). The interaction with methanol is examined by temperature-programmed desorption of methanol and carbon monoxide and by X-ray photoelectron spectroscopy. The decomposition of methanol proceeds in two reaction pathways independent of the particle composition: complete dehydrogenation towards carbon monoxide and hydrogen, and C--O bond scission yielding carbon deposits. Pd is the most active material studied here. The relative importance of the two channels varies for the different particle systems: on Pd dehydrogenation is preferred, whereas the C--O bond cleavage is more pronounced on Co. The bimetallic clusters show a moderate performance for both pathways. Carbon deposition poisons the model catalysts by blocking the adsorption sites for methoxide, which is the first intermediate product during methanol decomposition. In particular on Co, large amounts of carbon deposits can also be caused by dissociation of the final product of the dehydrogenation pathway, carbon monoxide. A comparison with the results of methanol decomposition on Co, Pd, and CoPd catalysts in continuous-flow reactors demonstrates that the findings of the present UHV study are relevant for catalytic performance under high-pressure conditions.

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Section: Carbon Monoxide Dissociation On Monometallic Comentioning

confidence: 92%

UHV Studies of Methanol Decomposition on Mono‐ and Bimetallic CoPd Nanoparticles Supported on Thin Alumina Films

et al. 2008

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“…The other two peaks belong to the stepwise reduction of Co 3 O 4 to metallic cobalt. According to the literature [21][22][23][24][25][26], the second reduction peak (P H 2 -II) centered at 250-350 8C is due to the reduction of Co 3+ to Co 2+ , and the third peak (P H 2 -III) at the region of 370-600 8C is due to the reduction of Co 2+ to metallic cobalt Co 0 and partial reduction of Ce 4+ to Ce 3+ . From these profiles, it can be seen that the reduction behavior of the catalyst is greatly influenced by the preparation method.…”

Section: H 2 -Tpr Measurementsmentioning

confidence: 99%

Promotion effect of residual K on the decomposition of N2O over cobalt–cerium mixed oxide catalyst

Xue

Zhang

et al. 2007

Catalysis Today

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A series of cobalt-cerium mixed oxide catalysts (Co 3 O 4 -CeO 2 ) with a Ce/Co molar ratio of 0.05 were prepared by co-precipitation (with K 2 CO 3 and KOH as the respective precipitant), impregnation, citrate, and direct evaporation methods and then tested for the catalytic decomposition of N 2 O. XRD, BET, XPS, O 2 -TPD and H 2 -TPR methods were used to characterize the catalysts. Catalysts with a trace amount of residual K exhibited higher catalytic activities than those without. The presence of appropriate amount of K in Co 3 O 4 -CeO 2 may improve the redox property of Co 3 O 4 , which is important for the decomposition of N 2 O. When the amount of K was constant, the surface area became the most important factor for the reaction. The co-precipitation-prepared catalyst with K 2 CO 3 as precipitant exhibited the best catalytic performance because of the presence of ca. 2 mol% residual K and the high surface area. We also discussed the rate-determining step of the N 2 O decomposition reaction over these Co 3 O 4 -CeO 2 catalysts. #

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“…The other two peaks are for the stepwise reduction of Co 3 O 4 to metallic cobalt. According to the literature [35][36][37], the second reduction peak (P H2 -II) centered at 283 8C is due to the reduction of Co 3 O 4 to CoO (Eqs. (1)), and the third peak (P H2 -III) at the region of 310-480 8C is due to the reduction of CoO to metallic cobalt (Eqs.…”

Section: H 2 -Tprmentioning

confidence: 99%

Catalytic decomposition of N2O over CeO2 promoted Co3O4 spinel catalyst

Xue¹,

Zhang²,

He³

et al. 2007

Applied Catalysis B: Environmental

463

257

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Characterization and tests of planar Co3O4 model catalysts prepared by chemical vapor deposition

Cited by 125 publications

References 45 publications

UHV Studies of Methanol Decomposition on Mono‐ and Bimetallic CoPd Nanoparticles Supported on Thin Alumina Films

UHV Studies of Methanol Decomposition on Mono‐ and Bimetallic CoPd Nanoparticles Supported on Thin Alumina Films

Promotion effect of residual K on the decomposition of N2O over cobalt–cerium mixed oxide catalyst

Catalytic decomposition of N2O over CeO2 promoted Co3O4 spinel catalyst

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