Catalysis with membranes or catalytic membranes?

Ross, J.R.H.; Xue, E.

doi:10.1016/0920-5861(95)00126-z

Cited by 20 publications

(6 citation statements)

References 3 publications

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“…Catalysts are generally required to increase the kinetics of the WGS and there are a number of designs for incorporating the catalyst within a WGS-MR (Ross and Xue 1995). The use of a catalyst results in the majority of CO conversion and correspondingly the majority of the heat release, within the first ~20% of the reactor length.…”

Section: Water Gas Shift (Wgs) Membrane Reactorsmentioning

confidence: 99%

“…For a porous inorganic WGS-MR operating under Knudsen diffusion, Ross and Xue (1995) have modeled the relative concentration of each gas component as it passes through the reactor, with comparison to a plug flow reactor with no membrane present. Across the inorganic membrane, 90% CO conversion is observed compared to 65% for plug flow conditions, for S/C =1.…”

Section: Figurementioning

confidence: 99%

“…Hence, a low CO flowrate through the membrane unit is needed to produce a large residence time that allows the reaction to proceed significantly. To overcome this limitation it may be necessary to consider internal recycle streams to ensure sufficient residence time within the reactor (McCandless 1985;Ross and Xue 1995;Stern et al 1984;Tsuru and Hwang 1999).…”

Section: Figurementioning

confidence: 99%

See 2 more Smart Citations

CO2 capture from pre-combustion processes—Strategies for membrane gas separation

Scholes

Smith

Kentish

et al. 2010

International Journal of Greenhouse Gas Control

277

132

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The application of membrane gas separation to CO2 capture from a coal gasification process is one potential solution to reduce greenhouse gas emissions. This review considers the potential for either H2-or CO2-selective membranes in an integrated gasification combined cycle (IGCC) process. In particular, the advantages and disadvantages of metallic, porous inorganic and polymeric membranes are considered. This analysis is extended to consider membrane technology as an enhancement to the water gas shift reaction, to drive the production of hydrogen above the thermodynamic limit. The review concludes with a brief overview of the economics of incorporating membrane gas separation into the IGCC process and gives an indication of the potential economic use of membrane gas separation technology in the IGCC process.

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Section: Water Gas Shift (Wgs) Membrane Reactorsmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

See 1 more Smart Citation

CO2 capture from pre-combustion processes—Strategies for membrane gas separation

Scholes

Smith

Kentish

et al. 2010

International Journal of Greenhouse Gas Control

277

132

View full text Add to dashboard Cite

show abstract

“…The reactor can be adiabatic or isothermal. The effects of different flow patterns and reactor configurations on reaction conversions have been well documented. − Keuler published an extensive list of alkane and alcohol dehydrogenation reactions that have been studied and modeled to some extent in a membrane reactor. Those include methane steam reforming, water gas shift reaction, ethane dehydrogenation, propane dehydrogenation, butane and butene dehydrogenation, dehydrogenation of ethylbenzene to styrene, and ethanol dehydrogenation.…”

Section: Introductionmentioning

confidence: 99%

Comparing and Modeling the Dehydrogenation of Ethanol in a Plug-Flow Reactor and a Pd−Ag Membrane Reactor

Keuler

Lorenzen

2002

Ind. Eng. Chem. Res.

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In this study the performance of a membrane reactor was compared to that of a plug-flow reactor for the dehydrogenation of ethanol. The membrane consisted of a 2.2 µm Pd-Ag film (23 wt % Ag) deposited on the inside of an asymmetric R-alumina membrane tube (SCT). The membrane tube was packed with a 14.5 wt % Cu on SiO 2 catalyst. The effects of the sweep gas flow rate, the ethanol feed flow rate, and the temperature on acetaldehyde yield and selectivity were investigated. A model was developed using measured kinetic data and membrane permeance data to predict the performance of the membrane reactor. The membrane reactor performed significantly better than the plug-flow reactor at all temperatures tested. The best results were obtained at 275 °C, where the total ethanol exit conversion increased from 45% (plug-flow reactor) to 60% at low feed flow rates and from 36% to 46% at high feed flow rates. The acetaldehyde selectivity for the membrane reactor increased from the lower 80% range to above 90% at 275 °C. The model underpredicted the total ethanol conversion, indicating that the measured reaction rate parameters for a differential reactor were lower than those for the membrane reactor.

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“…The result is a more compact design, plus greater conversion. These types of membrane reactors are reviewed excellently by several researchers [118,205,[207][208][209][210][211][212][213].…”

Section: Palladium-based Membranesmentioning

confidence: 99%

A Review of Carbon Dioxide Selective Membranes: A Topical Report

Shekhawat¹,

Luebke²,

Pennline³

2003

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The atmospheric concentration of anthropogenic carbon dioxide (CO 2 ) has been increasing since the start of industrialization in the mid 19th century, and the rate is increasing. It is highly unlikely that fossil fuel combustion, the main contributor to anthropogenic CO 2 , will be replaced in the foreseeable future. Therefore, CO 2 capture and storage offer a new set of options for reducing greenhouse gas emissions, in addition to the current strategies of improving energy efficiency and increasing the use of renewable energy resources. Carbon dioxide selective membranes provide a viable energy-saving alternative for CO 2 separation, since membranes do not require any phase transformation. This review examines various CO 2 selective membranes for the separation of CO 2 and N 2 , CO 2 and CH 4 , and CO 2 and H 2 from flue or fuel gas. This review attempts to summarize recent significant advances reported in the literature about various CO 2 selective membranes, their stability, the effect of different parameters on the performance of the membrane, the structure and permeation properties relationships, and the transport mechanism applied in different CO 2 selective membranes. Finally, the future direction for CO 2 selective membranes is proposed. Hybrid organic-inorganic membranes have become an expanding field of research, as the introduction of organic molecules can improve the characteristics of a matrix. Hydrotalcite-type materials, perovskite-type oxides, lithium zirconate, and lithium silicate are also suggested as candidate materials for high temperature CO 2 selective membranes.

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Catalysis with membranes or catalytic membranes?

Cited by 20 publications

References 3 publications

CO2 capture from pre-combustion processes—Strategies for membrane gas separation

CO2 capture from pre-combustion processes—Strategies for membrane gas separation

Comparing and Modeling the Dehydrogenation of Ethanol in a Plug-Flow Reactor and a Pd−Ag Membrane Reactor

A Review of Carbon Dioxide Selective Membranes: A Topical Report

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