An oxygen permeable membrane microreactor with an in-situ deposited Bi1.5Y0.3Sm0.2O3− catalyst for oxidative coupling of methane

Othman, Nur Hidayati; Wu, Zhentao; Li, K.

doi:10.1016/j.memsci.2015.04.027

Cited by 56 publications

(43 citation statements)

References 32 publications

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“…The ethylene price in the cases in which the C 2 reactor yield has been decreased are still comparable to the price calculated by Spallina et al [11] for the conventional naphtha steam cracking. This means that if the membrane reactor experiments, in which the 30% C 2 yield has been overcome [32][33][34], can be extrapolated at industrial conditions without any loss in performance, the OCM technology could be located within the range of industrial viability for ethylene production. However, this step is not as straight-forward as it could seem, since most of these experimental works are carried out at very specific conditions.…”

Section: Comparison Of Different Reactor Configurationsmentioning

confidence: 99%

Oxidative Coupling of Methane in Membrane Reactors; A Techno-Economic Assessment

et al. 2020

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Oxidative coupling of methane (OCM) is a process to directly convert methane into ethylene. However, its ethylene yield is limited in conventional reactors by the nature of the reaction system. In this work, the integration of different membranes to increase the overall performance of the large-scale oxidative coupling of methane process has been investigated from a techno-economic point of view. A 1D membrane reactor model has been developed, and the results show that the OCM reactor yield is significantly improved when integrating either porous or dense membranes in packed bed reactors. These higher yields have a positive impact on the economics and performance of the downstream separation, resulting in a cost of ethylene production of 595–625 €/tonC2H4 depending on the type of membranes employed, 25–30% lower than the benchmark technology based on oil as feedstock (naphtha steam cracking). Despite the use of a cryogenic separation unit, the porous membranes configuration shows generally better results than dense ones because of the much larger membrane area required in the dense membranes case. In addition, the CO2 emissions of the OCM studied processes are also much lower than the benchmark technology (total CO2 emissions are reduced by 96% in the dense membranes case and by 88% in the porous membranes case, with respect to naphtha steam cracking), where the high direct CO2 emissions have a major impact on the process. However, the scalability and the issues associated with it seem to be the main constraints to the industrial application of the process, since experimental studies of these membrane reactor technologies have been carried out just on a very small scale.

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Section: Comparison Of Different Reactor Configurationsmentioning

confidence: 99%

Oxidative Coupling of Methane in Membrane Reactors; A Techno-Economic Assessment

et al. 2020

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“…As such, membrane reactors, providing a controlled O2 dosing, have long been envisaged as a promising OCM reactor configuration [8]. High permselectivity dense membranes avoid the expensive O2 separation step from air, however the low permeation flux limits the reactor's productivity [9][10][11][12]. Mixed ionic/electronic conducting (MIEC) dense membranes of perovskite structure have attracted particular research interest on account of their suitable for OCM operating temperature range at around 800 o C [13,14].…”

Section: Accepted M M a N U mentioning

confidence: 99%

Influencing selectivity in the oxidative coupling of methane by modulating oxygen permeation in a variable thickness membrane reactor

Onoja

Wang

Kechagiopoulos

2019

Chemical Engineering and Processing - Process Intensification

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The Oxidative Coupling of Methane (OCM) has been considered for years as a promising alternative for the production of higher hydrocarbons, namely ethane and ethylene. Nonetheless, OCM's inherent conversion-versus-selectivity limitations have not allowed till now for economical C2 yields to be achieved. Reactor engineering studies guided by a detailed mechanistic description of the reaction can directly contribute to obtaining an understanding of these limitations. In this work, a Variable Thickness Membrane Reactor (VTMR) is proposed, wherein O2 permeation along the reactor is modulated, aiming at maximizing C2 selectivity. 1D and 2D reactor simulations are carried out to compare the performance of this reactor to conventional co-feed Packed Bed Reactors (PBR) and Membrane Reactors without variable thickness (MR). Particular attention is given on the impact of gas phase reactions on C2 selectivity, while the effect of surface exchange kinetics on both sides of the membrane and bulk diffusion of O2 across the membrane is discriminated. When identical operating conditions (T = 1073 K, P = 1 atm, Space time = 7.85 s) and reactor geometry (Length = 0.1 m, Diameter = 0.01 m) were evaluated, the optimization performed of the VTMR configuration achieved a C2 selectivity of 67.26 %, in comparison to 47.86 % and 29.87 % for the MR and PBR, respectively, highlighting the potential of the concept.

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“…In this technique, the membrane substrate was immersed into the coating sol to procure a uniform coating layer on both surface sides of the membrane. Recently, a new coating method where vacuum condition in introduced into the coating system was proposed [33,34]. The use of vacuum allows uniform coating inside the membrane microchannels by removing the air inside the hollow fibre prior to the introduction of coating solution.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Fabrication of lanthanum-based perovskites membranes on porous alumina hollow fibre (AHF) substrates for oxygen enrichment

Sihar

Othman

Alias

et al. 2019

Ceramics International

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An oxygen permeable membrane microreactor with an in-situ deposited Bi1.5Y0.3Sm0.2O3− catalyst for oxidative coupling of methane

Cited by 56 publications

References 32 publications

Oxidative Coupling of Methane in Membrane Reactors; A Techno-Economic Assessment

Oxidative Coupling of Methane in Membrane Reactors; A Techno-Economic Assessment

Influencing selectivity in the oxidative coupling of methane by modulating oxygen permeation in a variable thickness membrane reactor

Fabrication of lanthanum-based perovskites membranes on porous alumina hollow fibre (AHF) substrates for oxygen enrichment

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