Oxidative coupling of methane on cordierite monoliths coated with Sr/La2O3 catalysts. Influence of honeycomb structure and catalyst-cordierite chemical interactions on the catalytic behavior

Sollier, Brenda Maria del Valle; Gómez, Leticia Ester; Boix, Alicia Viviana; Miró, Eduardo Ernesto

doi:10.1016/j.apcata.2017.10.023

Cited by 32 publications

(20 citation statements)

References 38 publications

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“…One of the most important applications of La 2 O 3 as a catalyst is oxidative coupling of methane (OCM), in which La 2 O 3 -based catalysts exhibit excellent catalytic performance and give a commercialization potential (DeBoy and Hicks, 1988;Huang et al, 2013;Song et al, 2015;Jiang et al, 2016;Aseem et al, 2018;Gambo et al, 2018;Sollier et al, 2018). OCM reaction produces ethylene, a vital building block in the chemical industry (Gao et al, 2019), by direct coupling of CH 3 radicals in the gas phase.…”

Section: Introductionmentioning

confidence: 99%

An In Situ Temperature-Dependent Study of La2O3 Reactivation Process

et al. 2021

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Lanthanum-containing materials are widely used in oxidative catalytic and electrocatalytic reactions such as oxidative coupling of methane (OCM) and solid oxide fuel cells (SOFCs). However, many of these materials are highly susceptible to air contamination which means ex situ characterization results generally cannot be associated with their reactivity. In this study, the activation processes of an in situ–prepared bulk La2O2CO3 sample and an ex situ as-prepared La(OH)3 sample are in situ investigated by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and online mass spectroscopy (MS). Results indicate that the La2O2CO3 sample, during linear heating to 800°C, always contains some carbonates near the surface region, which supports a two-step model of bulk carbonate decomposition through surface sites. The La(OH)3 sample structure evolution is more complex due to contaminations from air exposure. Together with TGA results, online mass analysis of water and CO2 signal loss showed that three major catalyst structure phase change steps and a preheating up to 800°C are required for the as-prepared material to be transferred to La2O3. This process is carefully investigated combining the three in situ methodologies. XPS and XRD data further reveal transformations of variety of in situ surface structures and forms including hybrid phases with hydroxyl, carbonates, and oxide as the sample heated to different temperatures within the range from 200 to 800°C. The results provide useful insights on the activation and deactivation of La-contained materials.

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Section: Introductionmentioning

confidence: 99%

An In Situ Temperature-Dependent Study of La2O3 Reactivation Process

et al. 2021

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“…CH 4 conversions higher than 30% at C2 yield levels of 20-25% have been reported over structured rings and monoliths based on bismuth-yttrium-samarium oxide [175]. According to these authors, the superior activity of the monolith-like structured catalytic reactor would relate to its organised flow pattern, which can contribute to more efficient interaction between reactants and the catalyst surface, as also concluded by others [56]. More recently, La 2 Ce 1.5 Ca 0.5 O 7 oxides have also been reported to reach similar catalytic performances, with demonstrated thermal stability for up to 100 h [38].…”

Section: Trimetallic Oxidesmentioning

confidence: 67%

Oxidative Coupling of Methane for Ethylene Production: Reviewing Kinetic Modelling Approaches, Thermodynamics and Catalysts

et al. 2021

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Ethylene production via oxidative coupling of methane (OCM) represents an interesting route for natural gas upscaling, being the focus of intensive research worldwide. Here, OCM developments are analysed in terms of kinetic mechanisms and respective applications in chemical reactor models, discussing current challenges and directions for further developments. Furthermore, some thermodynamic aspects of the OCM reactions are also revised, providing achievable olefins yields in a wide range of operational reaction conditions. Finally, OCM catalysts are reviewed in terms of respective catalytic performances and thermal stability, providing an executive summary for future studies on OCM economic feasibility.

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“…The experiments were conducted in a fixed-bed flow quartz reactor at atmospheric pressure. The reactor design was described in a previous work [29]. The system was heated with a furnace to reach the desired temperatures.…”

Section: Catalytic Testsmentioning

confidence: 99%

Synthesis and Characterization of Electrospun Nanofibers of Sr-La-Ce Oxides as Catalysts for the Oxidative Coupling of Methane

Sollier

Bonne

Khenoussi

et al. 2020

Ind. Eng. Chem. Res.

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Catalytic nanofibers composed of LaCe and Sr-LaCe oxides were synthetized by electrospinning method with 5 wt.% of Sr and different La/Ce molar ratios. The materials were obtained by calcining electrospun polymer composite fibers and were studied for the oxidative coupling of methane (OCM). The catalytic performance was compared with analogous Sr-LaCe powder catalysts. SEM micrographs of Sr-LaCe fibers (La/Ce: 0.1, 0.2, 1 and 3) showed nanostructures with homogenous and uniform diameters (170-200 nm). In addition, the XRD patterns revealed the formation of crystalline solid solutions like LaxCeyOz. The strontium enhanced the CH4 conversion and C2 selectivity, since it possibly generated structural defects that promote the formation of superoxide species. The SrLaCe3 nanofibers reached a CH4 conversion of 28.5 % and C2 yield of 21.7 % at 600 ºC. The nanofibers randomly packed improved the heat and mass transfer properties due to a high geometric surface ratio with high bed porosity.

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Oxidative coupling of methane on cordierite monoliths coated with Sr/La2O3 catalysts. Influence of honeycomb structure and catalyst-cordierite chemical interactions on the catalytic behavior

Abstract: coupling of methane on cordierite monoliths coated with Sr/La2O3 catalysts.Influence of honeycomb structure and catalystcordierite chemical interactions on the catalytic behavior, Applied Catalysis A, General

Cited by 32 publications

References 38 publications

An In Situ Temperature-Dependent Study of La2O3 Reactivation Process

An In Situ Temperature-Dependent Study of La2O3 Reactivation Process

Oxidative Coupling of Methane for Ethylene Production: Reviewing Kinetic Modelling Approaches, Thermodynamics and Catalysts

Synthesis and Characterization of Electrospun Nanofibers of Sr-La-Ce Oxides as Catalysts for the Oxidative Coupling of Methane

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