Combustion of methane on CeO2–ZrO2 based catalysts

Bozo, Christine; Guilhaume, N.; Garbowski, Édouard; Primet, Michel

doi:10.1016/s0920-5861(00)00270-4

Cited by 159 publications

(92 citation statements)

References 25 publications

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“…15 No reduction was observed for g-Al 2 O 3 and ZrO 2 . 16,17 Ce-ZrO 2 supports presented maximum temperatures of reduction that shifted from 602 to 549 ºC with increasing CeO 2 content. These peaks are related to the CeO 2 reduction in a solid Ce-ZrO 2 solution, which happened at a lower temperature than the reduction temperature observed for pure CeO 2 .…”

Section: Catalyst Characterizationmentioning

confidence: 98%

“…Several authors have also observed this indirect mechanism with Pt/ZrO 2 , 35 Pt/Ce-ZrO 2 and Rh/Ce-ZrO 2 catalysts. 16,17 In fact, recent theoretical and experimental results showed that the indirect mechanism is most probable for the catalytic partial oxidation of CH 4 as CO and H 2 are predominantly formed upon complete O 2 depletion from the sequential reforming steps. 42 The advantage of using CeZrO 2 as a support has been explained by the continuous removal of carbonaceous deposits from the active sites at the metal-support interfacial perimeter.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Partial oxidation of methane to syngas on Rh/Al2O3 and Rh/Ce-ZrO2 catalysts

Oliveira¹,

Bitencourt²,

Passos³

2013

J. Braz. Chem. Soc.

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A oxidação parcial do metano sobre catalisadores de ródio suportados em g-Al 2 O 3 , CeO 2 , ZrO 2 e Ce-ZrO 2 foi investigada. Medidas de DRIFTS (espectroscopia no infravermelho com reflectância difusa) de CO adsorvido mostraram que houve a formação de diferentes espécies de ródio nos diferentes suportes, o que por sua vez influenciou na dispersão do metal. Os efeitos da dispersão metálica e da capacidade de armazenamento de oxigênio sobre a atividade dos catalisadores na oxidação parcial foram discutidos.The partial oxidation of methane with g-Al 2 O 3 -, CeO 2 -, ZrO 2 -and Ce-ZrO 2 -supported rhodium catalysts was investigated. DRIFTS (diffuse reflectance infrared spectroscopy) measurements of adsorbed CO showed the formation of different rhodium species on different supports, which influenced the dispersion of the metal. The effects of the metal dispersion, oxygen storage capacity on the activity of these catalysts for the partial oxidation of methane are discussed.Keywords: methane partial oxidation, methane, ceria-zirconia, rhodium, DRIFTS IntroductionThe catalytic partial oxidation of methane is an alternative to steam reforming, the industrial process for the production of synthesis gas from methane. Partial oxidation is a more energy efficient and less expensive process than steam reforming. The partial oxidation of methane (POM) is a mildly exothermic reaction, in which methane reacts with a limited amount of oxygen to produce hydrogen and carbon monoxide:The POM process is capable of producing syngas with a H 2 /CO ratio of approximately 2, which makes it a favorable method for methanol and hydrocarbon synthesis. 1,2 Noble metal catalysts (Ir, Ru, Rh, Pt, Pd) exhibit high activity, along with long-term stability, while minimizing the levels of coking, particularly when compared to the non-noble metals (such as Fe, Co, Ni). 1,2 The lack of a hydrogen infrastructure, as well as disadvantages in hydrogen storage, has stimulated the development of compact fuel processors, which are able to produce a rich hydrogen gas mixture from hydrocarbons. Several studies have reported that Rh catalysts are especially appropriate for use in compact fuel processors because of their high activity, selectivity for syngas and resistance to carbon deposition. 2 One of the main disadvantages of methane conversion is the deactivation due to coke formation. Thus, there is a great interest in designing catalysts that minimize the deleterious effect of coking. The presence of oxygen vacancies in supports that contain CeO 2 proved to be instrumental in keeping the metal particles free from coke deposition during the steam reforming, 3-5 partial oxidation, 6-9 CO 2 reforming and autothermal reforming of methane, 10-12 when using nickel or noble metals as catalysts. [13][14][15] Furthermore, ceria may also improve the catalytic performance by increasing the noble metal dispersion and stabilizing the support. Both the metal dispersion and support reducibility of Pt/CeO 2 and Pt/Ce x Zr 1-x O 2 were found to influence the catalytic ...

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Section: Catalyst Characterizationmentioning

confidence: 98%

Section: Catalyst Characterizationmentioning

confidence: 99%

Partial oxidation of methane to syngas on Rh/Al2O3 and Rh/Ce-ZrO2 catalysts

Oliveira¹,

Bitencourt²,

Passos³

2013

J. Braz. Chem. Soc.

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“…Very close (if not identical) wavenumber values are ascribed to different surface species, especially concerning the peak observed at 1590 cm À1 . If we consider the 1600-1575 cm À1 range, this band accounts either for formates [54,59,60,64,65,[68][69][70][71][72][73][74] or for carbonates species [67,[75][76][77]. Some authors do not even dare to definitely ascribe a peak of this region to a well-defined structure (see e.g.…”

Section: Co Feed On a Pre-oxidized Catalystmentioning

confidence: 99%

Investigation of the behaviour of a Pd/γ-Al2O3 catalyst during methane combustion reaction using in situ DRIFT spectroscopy

Demoulin

Navez

Ruíz

2005

Applied Catalysis A: General

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“…Bozo et al, * To whom all correspondence should be addressed. E-mail: n-sakai@aist.go.jp reported the CeO 2 -ZrO 2 solid solution as a promising support material for catalysts of methane oxidation [4]. Since methane is one of the most popular fuels for SOFC, the CeO 2 -ZrO 2 solid solution can be also used as anode additives for SOFC.…”

Section: Introductionmentioning

confidence: 99%

Interaction between Water and Ceria-Zirconia-Yttria Solid Solutions

et al. 2004

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We have investigated the water solubility, oxygen isotope diffusivity, and oxygen surface exchange coefficient in a humid atmosphere of the system {(CeO 2 ) x (ZrO 2 ) 1−x } 0.8 (YO 1.5 ) 0.2 (x = 0-1) by using isotope exchange and secondary ion mass spectrometry (SIMS). The deuterium ion ( 2 D − ) was detected from the {(CeO 2 ) x (ZrO 2 ) 1−x } 0.8 (YO 1.5 ) 0.2 polycrystals which were annealed in D 2 O containing atmosphere. The solubility of deuterium in the polycrystals increased with the cerium content (x). The oxygen exchange rate constant (α) in air at T = 973 K shows a maximum at x = 0.2-0.3, which can be correlated to the compositional dependence of electronic conductivity of {(CeO 2 ) x (ZrO 2 ) 1−x } 0.8 (YO 1.5 ) 0.2 . The effect of water on the surface exchange rate constant was more significantly observed for the samples with higher content of cerium x > 0.6.

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Combustion of methane on CeO2–ZrO2 based catalysts

Cited by 159 publications

References 25 publications

Partial oxidation of methane to syngas on Rh/Al2O3 and Rh/Ce-ZrO2 catalysts

Partial oxidation of methane to syngas on Rh/Al2O3 and Rh/Ce-ZrO2 catalysts

Investigation of the behaviour of a Pd/γ-Al2O3 catalyst during methane combustion reaction using in situ DRIFT spectroscopy

Interaction between Water and Ceria-Zirconia-Yttria Solid Solutions

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