C2 yield enhancement during oxidative coupling of methane in a nonpermselective porous membrane reactor

Aseem, A.; Harold, Michael P.

doi:10.1016/j.ces.2017.09.035

Cited by 21 publications

(8 citation statements)

References 36 publications

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“…The reaction mechanism is also accounted for the free radical coupling reactions such as oxidative coupling of methane. The selectivity to C 2 -hydrocarbons may be as high as 20% for the reaction proceeded under certain conditions, through a gas-phase reaction route [73,74]. These C 2 -hydrocarbons are undesirable during the catalytic partial oxidation process, as they can cause the problem related to the formation of coke.…”

Section: Reaction Mechanismsmentioning

confidence: 99%

RETRACTED: Computational Fluid Dynamics Modeling of the Catalytic Partial Oxidation of Methane in Microchannel Reactors for Synthesis Gas Production

Chen

Song

2018

Processes

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This paper addresses the issues related to the favorable operating conditions for the small-scale production of synthesis gas from the catalytic partial oxidation of methane over rhodium. Numerical simulations were performed by means of computational fluid dynamics to explore the key factors influencing the yield of synthesis gas. The effect of mixture composition, pressure, preheating temperature, and reactor dimension was evaluated to identify conditions that favor a high yield of synthesis gas. The relative importance of heterogeneous and homogenous reaction pathways in determining the distribution of reaction products was investigated. The results indicated that there is competition between the partial and total oxidation reactions occurring in the system, which is responsible for the distribution of reaction products. The contribution of heterogeneous and homogeneous reaction pathways depends upon process conditions. The temperature and pressure play an important role in determining the fuel conversion and the synthesis gas yield. Undesired homogeneous reactions are favored in large reactors, and at high temperatures and pressures, whereas desired heterogeneous reactions are favored in small reactors, and at low temperatures and pressures. At atmospheric pressure, the selectivity to synthesis gas is higher than 98% at preheating temperatures above 900 K when oxygen is used as the oxidant. At pressures below 1.0 MPa, alteration of the dimension in the range of 0.3 and 1.5 mm does not result in significant difference in reactor performance, if made at constant inlet flow velocities. Air shows great promise as the oxidant, especially at industrially relevant pressure 3.0 MPa, thereby effectively inhibiting the initiation of undesired homogeneous reactions.

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Section: Reaction Mechanismsmentioning

confidence: 99%

RETRACTED: Computational Fluid Dynamics Modeling of the Catalytic Partial Oxidation of Methane in Microchannel Reactors for Synthesis Gas Production

Chen

Song

2018

Processes

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“…In work by Aseem et al, it was stated that “In the absence of a sufficient transmembrane pressure gradient, back-diffusion of tube side reactant to the feed side can occur” [ 50 ]. In addition, it was also shown that the morphology of the membrane should be tailored in order to minimize back-diffusion [ 51 ].…”

Section: Resultsmentioning

confidence: 99%

“…P refers to the pressure, T is the temperature, R is the universal gas constant, x i is the fraction of component i, µ (Pa•s) is the dynamic viscosity, and r refers to the radial direction. In work by Aseem et al, it was stated that "In the absence of a sufficient transmembrane pressure gradient, back-diffusion of tube side reactant to the feed side can occur" [50]. In addition, it was also shown that the morphology of the membrane should be tailored in order to minimize back-diffusion [51].…”

Section: Permeation Mechanisms Through the Porous Membranementioning

confidence: 99%

Experimental Investigation of the Oxidative Coupling of Methane in a Porous Membrane Reactor: Relevance of Back-Permeation

et al. 2020

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Novel reactor configurations for the oxidative coupling of methane (OCM), and in particular membrane reactors, contribute toward reaching the yield required to make the process competitive at the industrial scale. Therefore, in this work, the conventional OCM packed bed reactor using a Mn-Na2WO4/SiO2 catalyst was experimentally compared with a membrane reactor, in which a symmetric MgO porous membrane was integrated. The beneficial effects of distributive feeding of oxygen along the membrane, which is the main advantage of the porous membrane reactor, were demonstrated, although no significant differences in terms of performance were observed because of the adverse effects of back-permeation prevailing in the experiments. A sensitivity analysis carried out on the effective diffusion coefficient also indicated the necessity of properly tuning the membrane properties to achieve the expected promising results, highlighting how this tuning could be addressed.

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“…Nonetheless, further investigation is required, because neither 1D nor 2D modeling approaches were able to predict the occurrence of local hot spots. The experimental results of previous studies and others − can be found in Table S2 in the Supporting Information file.…”

Section: Oxidative Coupling Of Methane (Ocm) In Distributed Feed Modementioning

confidence: 99%

Divide to Conquer: On the Use of Distributed Feed Strategies in Oxidative Coupling of Methane

Alahmadi,

Bavykina,

Morlanes

et al. 2023

Ind. Eng. Chem. Res.

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The oxidative coupling of methane (OCM) represents a promising method for the direct conversion of methane into ethylene, the most highly sought-after olefin in the petrochemical market. Nevertheless, the adoption of the OCM in industrial applications has been hampered by inherent chemical and engineering challenges. As a result, research endeavors have been directed toward developing innovative strategies to enhance the performance of the OCM process. This review offers a comprehensive overview of the challenges faced by the OCM, which has led to research exploring the use of a distributed feed policy. In this approach, methane and oxygen (the reactants for the OCM) are introduced separately, either through multiple oxygen injection points in the case of packed-bed reactors or into two distinct compartments in the case of membrane reactors. Additionally, we present an overview of the various types of membranes utilized in this context. More particularly, we focus on the use of mixed-ionic-electronic-conducting (MIEC) membranes to address the challenges of OCM. Due to their unique ionic conductive properties, MIEC membranes help to increase the overall efficiency of the OCM process. For example, an MIEC membrane intensifies the process for both air separation and the OCM reaction being conducted in a single unit, consequently simplifying upstream processing. It also aids in conducting the OCM reaction in a much safer environment, where gas-phase reactions of methane and oxygen are eliminated. With oxygen being a limited reactant in the OCM, this configuration also helps achieve higher methane conversion by allowing the safe feeding of more oxygen. Additionally, higher selectivity can be achieved by suppressing gas-phase reactions. In this case, oxygen is directly available in the catalyst zone. Finally, this review investigates the chemical and mechanical stability of MIEC membranes for OCM applications, and we conclude with important remarks and outlooks.

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C2 yield enhancement during oxidative coupling of methane in a nonpermselective porous membrane reactor

Cited by 21 publications

References 36 publications

RETRACTED: Computational Fluid Dynamics Modeling of the Catalytic Partial Oxidation of Methane in Microchannel Reactors for Synthesis Gas Production

RETRACTED: Computational Fluid Dynamics Modeling of the Catalytic Partial Oxidation of Methane in Microchannel Reactors for Synthesis Gas Production

Experimental Investigation of the Oxidative Coupling of Methane in a Porous Membrane Reactor: Relevance of Back-Permeation

Divide to Conquer: On the Use of Distributed Feed Strategies in Oxidative Coupling of Methane

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