Dense ceramic membranes for partial oxidation of methane to syngas

Balachandràn, U.; Dusek, J.T.; Mieville, R.L.; Poeppel, R.B.; Kleefisch, M. S.; Pei, Supeng; Kobylinski, T.P.; Udovich, C.A.; Bose, Arun C.

doi:10.1016/0926-860x(95)00159-x

Cited by 347 publications

(208 citation statements)

References 21 publications

Supporting

Mentioning

204

Contrasting

Unclassified

Order By: Relevance

“…The heat released at the reaction zone is transferred to the membrane, as well as to the feed side, raising its temperature, and further enhancing the oxygen permeation flux. Partial oxidation and fuel pyrolysis are also seen on the permeate side, as reported in [17,18,26,54,55]. When fuel is introduced into a high temperature reactor without oxygen, the decomposition and pyrolysis of fuel proceed rather than combustion.…”

Section: Chemical Reactionsmentioning

confidence: 66%

“…: Species (26) T in = T feed , T sweep : Energy (27) At the membrane surface, flux-matching conditions are applied for the continuity, species and energy conservation equations. Across the ITM, oxygen is transported from the feed side to the permeate side.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…Therefore, oxy-fuel combustion, an important technology in power generation with carbon capture, can be performed in an ITM reactor without the need for extra purification for the exhaust stream. In another application, partial oxidation using the oxygen produced by the membrane can be used to reform a fuel to a synthesis gas composed of carbon monoxide and hydrogen [22][23][24][25][26]. As oxygen is introduced uniformly into the permeate side where partial oxidation takes place, ITM reactors achieve a higher carbon monoxide selectivity than typical reactors (e.g., co-fed, fixed bed reactors).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical simulation of ion transport membrane reactors: Oxygen permeation and transport and fuel conversion

Hong

Kirchen

Ghoniem

2012

Journal of Membrane Science

View full text Add to dashboard Cite

Ion transport membrane (ITM) based reactors have been suggested as a novel technology for several applications including fuel reforming and oxy-fuel combustion, which integrates air separation and fuel conversion while reducing complexity and the associated energy penalty. To utilize this technology more effectively, it is necessary to develop a better understanding of the fundamental processes of oxygen transport and fuel conversion in the immediate vicinity of the membrane. In this paper, a numerical model that spatially resolves the gas flow, transport and reactions is presented. The model incorporates detailed gas phase chemistry and transport. The model is used to express the oxygen permeation flux in terms of the oxygen concentrations at the membrane surface given data on the bulk concentration, which is necessary for cases when mass transfer limitations on the permeate side are important and for reactive flow modeling. The simulation results show the dependence of oxygen transport and fuel conversion on the geometry and flow parameters including the membrane temperature, feed and sweep gas flow, oxygen concentration in the feed and fuel concentration in the sweep gas.

show abstract

Section: Chemical Reactionsmentioning

confidence: 66%

Section: Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical simulation of ion transport membrane reactors: Oxygen permeation and transport and fuel conversion

Hong

Kirchen

Ghoniem

2012

Journal of Membrane Science

View full text Add to dashboard Cite

show abstract

“…For overall fuel-rich mixtures, syngas, composed of carbon monoxide and hydrogen, can be produced, rather than carbon dioxide and water. Rhodium-based catalysts added to the membrane surface enhance catalytic partial oxidation and enable higher selectivity (e.g., higher than 98% CH4 conversion and 90% CO selectivity [9]). The residence time in a catalytic membrane reactor is less than 0.1s [10,11], much faster than conventional syngas production (residence time is 0.5~1.5s), reducing the reactor size and lowering the capital costs of syngas production.…”

Section: Introductionmentioning

confidence: 99%

Laminar oxy-fuel diffusion flame supported by an oxygen-permeable-ion-transport membrane

Hong

Kirchen

Ghoniem

2013

Combustion and Flame

View full text Add to dashboard Cite

A numerical model with detailed gas-phase chemistry and transport was used to predict homogeneous fuel conversion processes and to capture the important features (e.g., the location, temperature, thickness and structure of a flame) of laminar oxy-fuel diffusion flames stabilized on the sweep side of an oxygen permeable ion transport membrane (ITM). We assume that the membrane surface is not catalytic to hydrocarbon or syngas oxidation. It has been demonstrated that an ITM can be used for hydrocarbon conversion with enhanced reaction selectivity such as oxy-fuel combustion for carbon capture technologies and syngas production. Within an ITM unit, the oxidizer flow rate, i.e., the oxygen permeation flux, is not a pre-determined quantity, since it depends on the oxygen partial pressures on the feed and sweep sides and the membrane temperature. Instead, it is influenced by the oxidation reactions that are also dependent on the oxygen permeation rate, the initial conditions of the sweep gas, i.e., the fuel concentration, flow rate and temperature, and the diluent. In oxy-fuel combustion applications, the sweep side is fuel-diluted with CO2, and the entire unit is preheated to achieve a high oxygen permeation flux. This study focuses on the flame structure under these conditions and specifically on the chemical effect of CO2 dilution. Results show that, when the fuel diluent is CO2, a diffusion flame with a lower temperature and a larger thickness is established in the vicinity of the membrane, in comparison with the case in which N2 is used as a diluent. Enhanced OH-driven reactions and suppressed H radical chemistry result in the formation of products with larger CO and H2O and smaller H2 concentrations. Moreover, radical concentrations are reduced due to the high CO2 fraction in the sweep gas. CO2 dilution reduces CH3 formation and slows down the formation of soot precursors, C2H2 and * Corresponding author. Tel.: +1 617 253 2295; Fax: +1 617 253 5981 Email address: ghoniem@mit.edu (Ahmed F. Ghoniem) 2 C2H4. The flame location impacts the species diffusion and heat transfer from the reaction zone towards the membrane, which affects the oxygen permeation rate and the flame temperature.

show abstract

“…Teraoka et al reported very high oxygen permeation fluxes through the perovskite oxide based on La 1−x A x Co 1−y Fe y O 3−δ [2][3][4]. Since then, there have been many efforts on the research of mixed-conducting membranes [5][6][7][8][9][10][11][12][13]. Recognizing the need for enhanced oxygen fluxes the Air Products/Ceramatec team has developed an asymmetric membrane [14].…”

Section: Introductionmentioning

confidence: 99%

Experimental and modeling studies on Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) tubular membranes for air separation

Wang

Liang

et al. 2004

Journal of Membrane Science

View full text Add to dashboard Cite

Dense ceramic membranes for partial oxidation of methane to syngas

Cited by 347 publications

References 21 publications

Numerical simulation of ion transport membrane reactors: Oxygen permeation and transport and fuel conversion

Numerical simulation of ion transport membrane reactors: Oxygen permeation and transport and fuel conversion

Laminar oxy-fuel diffusion flame supported by an oxygen-permeable-ion-transport membrane

Experimental and modeling studies on Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) tubular membranes for air separation

Contact Info

Product

Resources

About