High-temperature parallel screening of catalysts for the oxidative coupling of methane

Olivier, Louis; Haag, Stéphane; Pennemann, Helmut; Hofmann, C.; Mirodatos, C.; Veen, A.C. van

doi:10.1016/j.cattod.2008.02.024

Cited by 57 publications

(43 citation statements)

References 48 publications

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“…As can be easily observed, the investigated catalysts present roughly similar physical properties allowing to focus on the differences in chemical properties. The low values of the surface area of the catalysts are in line with previous findings [13,16,22].…”

Section: Catalystssupporting

confidence: 91%

“…Rare earth-promoted alkaline earth calcium oxide catalytic systems have only been investigated to a limited extent [13,14] although they are recognized as highly performing and stable OCM catalysts. It has been reported that CaO is a high temperature stable, basic catalyst support with La being involved in the oxygen activation and Sr enhancing the C2 selecticity.…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that CaO is a high temperature stable, basic catalyst support with La being involved in the oxygen activation and Sr enhancing the C2 selecticity. Within the present study, the catalyst 10%La -20%Sr/ CaO was selected to be investigated more elaborately given the promising perspectives from preliminary data [13].…”

Section: Introductionmentioning

confidence: 99%

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Quantitative screening of an extended oxidative coupling of methane catalyst library

Alexiadis

Chaar

Veen

et al. 2016

Applied Catalysis B: Environmental

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A comprehensive microkinetic model, including catalyst descriptors, that accounts for the homogeneous as well as heterogeneously catalyzed reaction steps in Oxidative Coupling of Methane (OCM) was used in the assessment of large kinetic datasets acquired on five different catalytic materials. The applicability of the model was extended from alkali magnesia catalysts represented by Li/MgO and Sn-Li/MgO and alkaline earth lanthana catalysts represented by Sr/La2O3 to rare earth-promoted alkaline earth calcium oxide catalysts, represented by LaSr/CaO, and to a Na-Mn-W/SiO2 catalyst. The model succeeded in adequately simulating the performance of all five investigated catalysts in terms of reactant conversion and product selectivities in the entire range of experimental conditions. It was found that the activity of Sr/La2O3, in terms of methane conversion, is approximately 2, 5, 30 and 33 times higher than over the La-Sr/CaO, Sn-Li/MgO, Na-Mn-W/SiO2 and Li/MgO catalysts, respectively, under identical operating conditions. This was attributed mainly to the high stability of adsorbed hydroxyls, the high stability of adsorbed oxygen and the high concentration of active sites of Sr/La2O3. The selectivity towards C2 products was found to depend on the methyl radical sticking coefficient and the stability of the adsorbed oxygen and was the highest on the Na-W-Mn/SiO2 catalyst, that is 75% at about 1% methane conversion and 1023K, 190 kPa and inlet molar CH4/O2 ratio of 4

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Section: Catalystssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Quantitative screening of an extended oxidative coupling of methane catalyst library

Alexiadis

Chaar

Veen

et al. 2016

Applied Catalysis B: Environmental

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“…Thus, the development of processes for the conversion of methane, which is the main component of natural gas and associated petroleum gas, into base products and half finished petroleum chemistry prod ucts is a problem of considerable current interest. Different methods were proposed for converting methane into economic value added products [4][5][6][7][8][9][10][11][12][13][14][15][16]. The oxidative condensation of methane (OCM) is con sidered as an effective method for the direct conversion of methane into the С 2 hydrocarbons-ethane and ethy lene [1,[5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Oxidative condensation of methane in the presence of modified MnNaW/SiO2 catalysts

et al. 2015

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The effects of cationic (Ce, Zr, and La) and anionic (S, P, and Cl) admixtures on the activity and physicochemical properties of MnNaW/SiO 2 were studied in order to optimize the composition of a catalyst for the oxidative condensation of methane (OCM). It was found that OCM process characteristics can be reg ulated by varying the type (Ce, Zr, La, S, P, and Cl) and concentration (0.5-5 wt %) of a modifying admix ture. For the modified MnNaW/SiO 2 catalysts, the yield of the target reaction products increased in the fol lowing order of modifying admixtures: S < Zr < P < Ce < La < Cl. The addition of lanthanum, cerium, or phosphorus admixtures insignificantly affected the activity of the MnNaW/SiO 2 catalyst, whereas the intro duction of sulfur or zirconium led to a decrease in the yield of C 2 hydrocarbons. Modification with chlorine improved process characteristics and shifted a maximum yield of C 2 hydrocarbons to the low temperature region. It was established that the introduction of lanthanum considerably improved the stability of catalyst operation. The catalyst composition 2Mn-1.6Na-3.1W-2La/SiO 2 was developed to afford a 22% yield of target C 2 hydrocarbons at a 54% conversion of methane after a 24 h reaction performed under optimum conditions (reaction temperature, 800°C; reaction mixture flow rate, 117 mL min -1 and O 2 /CH 4 molar ratio, 0.5).

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“…INTRODUCTION Lanthanide oxides are widely used in catalytic oxidation of light alkanes in the petrochemical industry. 1,2 Since oxygen species such as O 2 À , O 2 2À , and O À are responsible for the initial methane activation step, 2,3 a better understanding of the activated forms of these oxygen species as well as surface activation mechanism is of both scientific and technical importance. 4 It has been reported that surface oxygen species such as peroxide ions (O 2 2À ) can be generated by adsorption of O 2 molecules onto surface oxygen vacancies followed by dissociative adsorption of O 2 on the surface of lanthanide sesquioxides such as Ln 2 O 3 (Ln ¼ La, Nd, Sm, and Gd) via a photo-or heat-induced reaction.…”

mentioning

confidence: 99%

Investigation of activated oxygen molecules on the surface of Y2O3 nanocrystals by Raman scattering

Xiong

et al. 2013

Journal of Applied Physics

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High-temperature parallel screening of catalysts for the oxidative coupling of methane

Cited by 57 publications

References 48 publications

Quantitative screening of an extended oxidative coupling of methane catalyst library

Quantitative screening of an extended oxidative coupling of methane catalyst library

Oxidative condensation of methane in the presence of modified MnNaW/SiO2 catalysts

Investigation of activated oxygen molecules on the surface of Y2O3 nanocrystals by Raman scattering

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