Dense Oxide Membranes for Oxygen Separation and Methane Conversion

1997 ◽  
Vol 497 ◽  
Author(s):  
A. J. Jacobson ◽  
S. Kim ◽  
A. Medina ◽  
Y. L. Yang ◽  
B. Abeles
Keyword(s):  
Methane Conversion ◽  
Bulk Diffusion ◽  
Oxygen Permeation ◽  
Membrane Reactors ◽  
Surface Kinetics ◽  
Oxygen Separation ◽  
Ionic Conducting ◽  
Different Temperatures ◽  
Oxide Membranes ◽  
Conducting Membranes

ABSTRACTMethane conversion to synthesis gas in membrane reactors that use dense mixed electronic-ionic conducting membranes for oxygen separation has received much recent attention. The oxygen flux achievable in these reactors depends on a combination of the bulk diffusion rate for oxygen transport and the surface reaction rate for oxygen activation and either recombination or reaction with methane. Here we compare recent oxygen permeation data for tubular membranes of La0.5Sr0.5Fe0.8Ga0.2O3-δ with our previous results for SrCO0.8Fe0.2O3-δ, SrFeCO0.5O3.25-δ. The pressure dependence of the oxygen permeation flux has been measured at different temperatures and used to determine the relative importance of bulk and surface kinetics for these oxides.

scholarly journals Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

Processes ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 128 ◽  
Author(s):  
Alba Arratibel Plazaola ◽  
Aitor Cruellas Labella ◽  
Yuliang Liu ◽  
Nerea Badiola Porras ◽  
David Pacheco Tanaka ◽  
...  
Keyword(s):  
Production Systems ◽  
Oxygen Permeation ◽  
Permeation Rate ◽  
Membrane Reactors ◽  
Pure Oxygen ◽  
Dual Phase ◽  
Significant Progress ◽  
Chemical Production ◽  
Perovskite Materials ◽  
Conducting Membranes

Mixed ionic-electronic conducting membranes have seen significant progress over the last 25 years as efficient ways to obtain oxygen separation from air and for their integration in chemical production systems where pure oxygen in small amounts is needed. Perovskite materials are the most employed materials for membrane preparation. However, they have poor phase stability and are prone to poisoning when subjected to CO2 and SO2, which limits their industrial application. To solve this, the so-called dual-phase membranes are attracting greater attention. In this review, recent advances on self-supported and supported oxygen membranes and factors that affect the oxygen permeation and membrane stability are presented. Possible ways for further improvements that can be pursued to increase the oxygen permeation rate are also indicated. Lastly, an overview of the most relevant examples of membrane reactors in which oxygen membranes have been integrated are provided.

Ce0.9Gd0.1O2−δ membranes coated with porous Ba0.5Sr0.5Co0.8Fe0.2O3−δ for oxygen separation

RSC Advances ◽  
2015 ◽  
Vol 5 (7) ◽  
pp. 5379-5386 ◽  
Author(s):  
Chi Zhang ◽  
Ran Ran ◽  
Gia Hung Pham ◽  
Kun Zhang ◽  
Jian Liu ◽  
...  
Keyword(s):  
Short Circuit ◽  
Oxygen Permeation ◽  
Electronic Conduction ◽  
Doped Ceria ◽  
Oxygen Separation ◽  
Oxygen Ion ◽  
Ion Conducting ◽  
Conducting Membranes

Robust oxygen ion conducting membranes based on doped ceria oxides can be used as oxygen permeation membranes with a short circuit to provide the required electronic conduction.

Contribution of the Surface Reactions to the Overall Oxygen Permeation of the Mixed Conducting Membranes

2006 ◽  
Vol 45 (8) ◽  
pp. 2824-2829 ◽  
Author(s):  
Xianfeng Chang ◽  
Chun Zhang ◽  
Zhentao Wu ◽  
Wanqin Jin ◽  
Nanping Xu
Keyword(s):  
Surface Reactions ◽  
Oxygen Permeation ◽  
Conducting Membranes

scholarly journals Understanding the Impact of Hydrogen Activation by SrCe0.8Zr0.2O3−δ Perovskite Membrane Material on Direct Non-Oxidative Methane Conversion

2022 ◽  
Vol 9 ◽  
Author(s):  
Sichao Cheng ◽  
Su Cheun Oh ◽  
Mann Sakbodin ◽  
Limei Qiu ◽  
Yuxia Diao ◽  
...  
Keyword(s):  
Methane Conversion ◽  
Membrane Reactor ◽  
Membrane Reactors ◽  
Fixed Bed Reactor ◽  
Perovskite Oxide ◽  
Oxide Material ◽  
Hydrogen Activation ◽  
Permeable Membrane ◽  
The Impact

Direct non-oxidative methane conversion (DNMC) converts methane (CH4) in one step to olefin and aromatic hydrocarbons and hydrogen (H2) co-product. Membrane reactors comprising methane activation catalysts and H2-permeable membranes can enhance methane conversion by in situ H2 removal via Le Chatelier's principle. Rigorous description of H2 kinetic effects on both membrane and catalyst materials in the membrane reactor, however, has been rarely studied. In this work, we report the impact of hydrogen activation by hydrogen-permeable SrCe0.8Zr0.2O3−δ (SCZO) perovskite oxide material on DNMC over an iron/silica catalyst. The SCZO oxide has mixed ionic and electronic conductivity and is capable of H2 activation into protons and electrons for H2 permeation. In the fixed-bed reactor packed with a mixture of SCZO oxide and iron/silica catalyst, stable and high methane conversion and low coke selectivity in DNMC was achieved by co-feeding of H2 in methane stream. The characterizations show that SCZO activates H2 to favor “soft coke” formation on the catalyst. The SCZO could absorb H2in situ to lower its local concentration to mitigate the reverse reaction of DNMC in the tested conditions. The co-existence of H2 co-feed, SCZO oxide, and DNMC catalyst in the present study mimics the conditions of DNMC in the H2-permeable SCZO membrane reactor. The findings in this work offer the mechanistic understanding of and guidance for the design of H2-permeable membrane reactors for DNMC and other alkane dehydrogenation reactions.

Ionic conducting membranes based on new sulfonated poly(arylene ether ketone)s for fuel cell applications

2017 ◽  
Vol 55 (10) ◽  
pp. 771-777 ◽  
Author(s):  
Edouard Chauveau ◽  
Catherine Marestin ◽  
Régis Mercier ◽  
Eliane Espuche ◽  
Arnaud Morin
Keyword(s):  
Fuel Cell ◽  
Arylene Ether ◽  
Ionic Conducting ◽  
Ether Ketone ◽  
Conducting Membranes ◽  
Sulfonated Poly

Mixed conducting membranes - Macrostructure related oxygen permeation flux

AIChE Journal ◽  
2010 ◽  
Vol 56 (12) ◽  
pp. 3084-3090 ◽  
Author(s):  
Barbara Zydorczak ◽  
Kang Li ◽  
Xiaoyao Tan
Keyword(s):  
Oxygen Permeation ◽  
Permeation Flux ◽  
Oxygen Permeation Flux ◽  
Conducting Membranes

Experimental and modeling study of oxygen permeation modes for asymmetric mixed-conducting membranes

2008 ◽  
Vol 322 (2) ◽  
pp. 429-435 ◽  
Author(s):  
Xianfeng Chang ◽  
Chun Zhang ◽  
Xueliang Dong ◽  
Chao Yang ◽  
Wanqin Jin ◽  
...  
Keyword(s):  
Oxygen Permeation ◽  
Conducting Membranes ◽  
Modeling Study
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