Partial Oxidation of Methane to Synthesis Gas Using LnCoO3Perovskites as Catalyst Precursors

Lago, Rochel M.; Bini, Gianluca; Peña, M.A.; Fierro, J.L.G.

doi:10.1006/jcat.1997.1580

Cited by 156 publications

(70 citation statements)

References 43 publications

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“…The COP sample exhibited a Co 2p 3/2 peak at a binding energy of 778.6 eV, value lower than the one typically reported for cobalt oxides [48]. In addition to this, the absence of shake-up peaks in the spectra indicated that the Co atoms in this sample were mainly forming a LaCoO 3 phase [49]. By contrast, PEC and SCS samples exhibited Co 2p 3/2 core levels with binding energies close to 780 eV.…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 58%

Oxidative reforming of diesel fuel over LaCoO3 perovskite derived catalysts: Influence of perovskite synthesis method on catalyst properties and performance

Villoria¹,

Álvarez-Galván²,

Al-Zahrani³

et al. 2011

Applied Catalysis B: Environmental

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103

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Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 58%

Oxidative reforming of diesel fuel over LaCoO3 perovskite derived catalysts: Influence of perovskite synthesis method on catalyst properties and performance

Villoria¹,

Álvarez-Galván²,

Al-Zahrani³

et al. 2011

Applied Catalysis B: Environmental

Self Cite

103

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“…After reduction, a highly dispersed metal supported in the lanthanide or alkaline earth oxide is obtained. As an illustrative example, Lago et al [51] analysed the behaviour of LnCoO 3 systems (Ln = La, Pr, Nd, Sm, Gd). In this series, the reduced Gd-Co perovskite had the highest activity for CPO, followed by Sm > Nd > Pr.…”

Section: Perovskite Precursorsmentioning

confidence: 99%

Recent Developments in the Partial Oxidation of Methane to Syngas

Al-Sayari¹

2013

TOCATJ

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Natural gas is catalytically converted into several bulk chemicals such as ammonia, methanol, dimethyl ether, and synthetic liquid fuels by Fischer-Tropsch synthesis and similar processes. The main step in the conversion of natural gas to these products is the production of synthesis gas with the desired composition ranging from H 2 /CO = 3:1 used for the production of ammonia to the 1:1 mixture preferred for production of dimethyl ether. Catalysts and catalytic processes are important in the production of synthesis gas from natural gas. In this work, relevant catalytic systems employed recently in the production of syngas by the catalytic partial oxidation of methane, as well as experimental evidences on the reaction mechanisms are examined. Differences in methane dissociation, binding site preferences, stability of OH surface species, surface residence times of active species and contributions from lattice oxygen atoms and support species are considered. The methane dissociation requires reduced metal sites, but at elevated temperatures oxides of active species may be reduced by direct interaction with methane or from the reaction with H 2 and CO (or C). The comparison of elementary reaction steps on Pt and Rh illustrates the fact that a key factor to produce hydrogen as primary product is a high activation energy barrier to the formation of OH. Another essential property for the formation of H 2 and CO as primary products is a low surface coverage of intermediates, such that the probability of O-H, OH-H and CO-O interactions is reduced.

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“…La-Co-O showed TPR peaks at 391, 455 and 639°C. Since La is non-reducible under the TPR conditions, so such TPR peaks probable belonged to the reduction of Co. Lago et al [41] reported that LaCoO 3 showed TPR peaks at 360 and 571°C, corresponding to the reduction of Co 3+ ÞCo 2+ ÞCo 0 . Co 3 O 4 also appeared two TPR peaks near 257 and 457°C, which were assigned to the reduction of Co 3+ ÞCo 2+ and Co 2+ ÞCo 0 , respectively [42].…”

Section: Characterizationmentioning

confidence: 97%

Comparative studies on direct conversion of methane to methanol/formaldehyde over La–Co–O and ZrO2 supported molybdenum oxide catalysts

Zhang

et al. 2005

Top Catal

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The selective oxidation of methane with molecular oxygen over MoO x /La-Co-O and MoO x /ZrO 2 catalysts to methanol/ formaldehyde has been investigated in a specially designed high-pressure continuous-flow reactor. The properties of the catalysts, such as crystal phase, structure, reducibility, ion oxidation state, surface composition and the specific surface area have been characterized with the use of XRD, LRS, TPR, XPS and BET methods. MoO x /La-Co-O catalysts showed high selectivity to methanol formation while MoO x /ZrO 2 revealed the property for the formation of formaldehyde in the selective oxidation of methane. 7 wt% MoO x /La-Co-O catalyst gave 6.7% methanol yield (ca. 60% methanol selectivity) at 420°C and 4.2 MPa. On the other hand, the maximal yield of formaldehyde ca. 4% (47.8% formaldehyde selectivity) was obtained over 12 wt% MoO x /ZrO 2 catalyst at 400°C and 5.0 MPa. 7%MoO x /La-Co-O catalyst showed higher modified H 2 -consumption than 12%MoO x /ZrO 2 catalyst. The reducibility and the O ) /O 2) ratio of the catalysts may play important roles on the catalytic performance. The proper reducibility and the O ) /O 2) ratio enhanced the production of methanol in selective oxidation of methane. [MoO 4 ] 2) species in MoO x /ZrO 2 catalysts enable selective oxidation of methane to formaldehyde.

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Partial Oxidation of Methane to Synthesis Gas Using LnCoO3Perovskites as Catalyst Precursors

Cited by 156 publications

References 43 publications

Oxidative reforming of diesel fuel over LaCoO3 perovskite derived catalysts: Influence of perovskite synthesis method on catalyst properties and performance

Oxidative reforming of diesel fuel over LaCoO3 perovskite derived catalysts: Influence of perovskite synthesis method on catalyst properties and performance

Recent Developments in the Partial Oxidation of Methane to Syngas

Comparative studies on direct conversion of methane to methanol/formaldehyde over La–Co–O and ZrO2 supported molybdenum oxide catalysts

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