Alkali metal and alkaline earth metal perovskites for oxidative coupling of methane and oxidative dehydrogenation of ethane

Xu, Junwei; Ouyang, Rumeng; Zhong, Xusheng; Fang, Xiuzhong; Xu, Xianglan; Wang, Xiang

doi:10.1016/j.mcat.2023.113386

Cited by 3 publications

(3 citation statements)

References 42 publications

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“…Moreover, Jung et al and our previously studies have proven that a higher unit cell free volume ( V f ) enhances oxygen mobility. 18,37 Table 2 shows the V f values of NaNbO 3 and KNbO 3 , which have been calculated using methods listed in existing literature. 5,38 The V f of NaNbO 3 is significantly greater than that of KNbO 3 , which is consistent with their results for methane and oxygen conversions.…”

Section: Resultsmentioning

confidence: 99%

ANbO₃ (A = Na, K) and (A′ = Ca, Sr) composite oxides for oxidative coupling of methane and oxidative dehydrogenation of ethane: perovskite vs. layered perovskite

Xu,

Zhong,

Ouyang

et al. 2023

Catal. Sci. Technol.

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Section: Resultsmentioning

confidence: 99%

ANbO₃ (A = Na, K) and (A′ = Ca, Sr) composite oxides for oxidative coupling of methane and oxidative dehydrogenation of ethane: perovskite vs. layered perovskite

Xu,

Zhong,

Ouyang

et al. 2023

Catal. Sci. Technol.

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“…Their study revealed that both types of chalcogenides exhibit similar active sites in the OCM, with moderately and strongly basic sites proving to be favorable for OCM catalysis. Furthermore, the researchers observed a direct correlation between the surface alkalinity and the generation of reactive oxygen species, and they established an association between the presence of moderately basic sites and the concentration of oxygen vacancies which, in turn, plays a pivotal role in fostering the production of abundant reactive oxygen species [21]. Rane et al studied the influence of alkali metal doping on the surface properties and catalytic activity/selectivity of CaO catalysts in the OCM reaction.…”

Section: Alkali-metal-modified Alkaline Earth Metal Oxidementioning

confidence: 99%

Advances in Oxidative Coupling of Methane

Deng,

Chen,

Xia

et al. 2023

Atmosphere

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C2+ hydrocarbons, especially C2+ olefins, as important basic chemical raw materials, mainly come from petroleum cracking. With the increasing scarcity of petroleum resources, the search for new olefins production routes has become the focus of research, and the production of olefins by the oxidative coupling of methane (OCM) process has attracted extensive attention. The OCM route is an important alternative to the production of olefins from petroleum resources and is also an important direction for the development of efficient and clean utilization of natural gas. In this paper, the mechanism, catalysts, and other key factors for the production of olefins by methane oxidative coupling are reviewed. The mechanism of OCM, including the reaction pathway and the formation of intermediate products, is introduced. Then, commonly used catalysts, such as alkali metal/alkaline earth metal oxides, rare earth metal oxides, composite metal oxides with special structures, and classical catalysts Mn/Na2WO4/SiO2, and their mechanisms of action in the reaction are discussed. In addition, the application of chemical looping oxidative coupling of methane (CLOCM) in olefin production is also investigated, which is a promising alternative way due to the high selectivity of olefins and the low cost of catalysts owing to the excellent performance of the catalyst recycling. These studies will help to further understand the mechanism of OCM for olefin production and provide guidance and support for applications in related fields.

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“…Currently, research efforts on the OCM reaction are mainly focused on enhancing selectivity and the yield of C2 products through strategies like employing higher-selective catalysts. Various types of catalysts have been investigated in the literature, including alkali metal oxides, , alkaline earth metal oxides, , rare earth metal oxides, , transition metal oxides, , and Mn–Na 2 WO 4 -based , and Perovskite (ABO 3 ) catalysts, , for their effective activation effect and higher C2 selectivity in the OCM reaction.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Effect of Inhomogeneous Flow Behaviors inside a Particle Cluster in the OCM Reaction

Wang,

Hao,

Song

et al. 2024

Ind. Eng. Chem. Res.

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Fluidized bed reactors are commonly considered as more effective devices for the oxidative coupling of methane (OCM) reaction in comparison to traditional fixed bed reactors. In a fluidized bed, particles are prone to agglomerate to generate clusters, changing the original fluidization state and weakening the catalytic ability of catalyst particles. In this study, the inhomogeneous flow behaviors of gaseous species inside a particle cluster were investigated via the computational fluid dynamics (CFD) method compared to isolated particles. The effect of flow characteristics on the heat transfer and the spatial distribution of products of the OCM reaction were subsequently studied. The results indicated that obstruction caused by outer particles of the cluster resulted in the inhomogeneous flow behaviors inside the cluster, leading to the formation of hot spots, the excessive oxidation of C 2 H 4 , and the generation of CO 2 . C 2 H 4 was found to be unevenly concentrated inside the particle cluster, with a higher level on the upwind side and a lower level on the downwind side, while it was more uniformly distributed in the isolated particle model. The C 2 H 4 yield was significantly lower in the particle cluster model than that in the isolated particle model, with reductions of 47.66% from the peak value and 37.12% from the average value under different working conditions in a model of three-layer 13 particle structure. These results emphasized the uneven flow behaviors of fluids, which impeded the heat transfer between gas and solid and ultimately resulted in the formation of CO 2 and the reduction of C 2 H 4 yield. A prediction model was developed to describe the inhibition effect of uneven flow behaviors on the C 2 H 4 yield. Furthermore, improving uneven flow behaviors to alleviate the cluster effect on reaction efficiency could be a key focus for future research.

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Alkali metal and alkaline earth metal perovskites for oxidative coupling of methane and oxidative dehydrogenation of ethane

Cited by 3 publications

References 42 publications

ANbO₃ (A = Na, K) and (A′ = Ca, Sr) composite oxides for oxidative coupling of methane and oxidative dehydrogenation of ethane: perovskite vs. layered perovskite

ANbO₃ (A = Na, K) and (A′ = Ca, Sr) composite oxides for oxidative coupling of methane and oxidative dehydrogenation of ethane: perovskite vs. layered perovskite

Advances in Oxidative Coupling of Methane

Numerical Investigation of the Effect of Inhomogeneous Flow Behaviors inside a Particle Cluster in the OCM Reaction

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Alkali metal and alkaline earth metal perovskites for oxidative coupling of methane and oxidative dehydrogenation of ethane

Cited by 3 publications

References 42 publications

ANbO3 (A = Na, K) and (A′ = Ca, Sr) composite oxides for oxidative coupling of methane and oxidative dehydrogenation of ethane: perovskite vs. layered perovskite

ANbO3 (A = Na, K) and (A′ = Ca, Sr) composite oxides for oxidative coupling of methane and oxidative dehydrogenation of ethane: perovskite vs. layered perovskite

Advances in Oxidative Coupling of Methane

Numerical Investigation of the Effect of Inhomogeneous Flow Behaviors inside a Particle Cluster in the OCM Reaction

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ANbO₃ (A = Na, K) and (A′ = Ca, Sr) composite oxides for oxidative coupling of methane and oxidative dehydrogenation of ethane: perovskite vs. layered perovskite

ANbO₃ (A = Na, K) and (A′ = Ca, Sr) composite oxides for oxidative coupling of methane and oxidative dehydrogenation of ethane: perovskite vs. layered perovskite