Sorption‐enhanced reaction process for hydrogen production

Hufton, Jeffrey R.; Mayorga, S.G.; Sircar, Shivaji

doi:10.1002/aic.690450205

Cited by 467 publications

(404 citation statements)

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“…[14][15][16] Recently, LDH materials have also been investigated in novel reactive separation processes to increase the conversion of catalytic reactions by removing one of the products from the reactor. 17,18 In our research these materials are used for the preparation of nanoporous membranes, intended for the separation of gases, particularly CO 2 , at high temperatures. 19 LDH find applications in a broad range of temperatures, from room-temperature adsorption to high-temperature catalytic reactions and separations.…”

Section: Introductionmentioning

confidence: 99%

Thermal Evolution of the Structure of a Mg−Al−CO₃ Layered Double Hydroxide: Sorption Reversibility Aspects

Kim

Yang

Liu

et al. 2004

Ind. Eng. Chem. Res.

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In our prior study, we employed several in-situ techniques to investigate the thermal evolution of the structure of a Mg-Al-CO 3 layered double hydroxide (LDH) under an inert atmosphere and proposed a model to describe the structural evolution of the Mg-Al-CO 3 LDH structure. In this paper we present results of our ongoing investigations with these materials pertaining to their sorption characteristics and thermal reversibility under both inert and reactive atmospheres. The experimental observations are shown to be consistent with the structural model for the LDH previously proposed. The structure, sorption characteristics, and thermal reversibility of these materials are of importance in their use for the preparation of CO 2 -permselective membranes for high-temperature membrane reactor applications.

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Section: Introductionmentioning

confidence: 99%

Thermal Evolution of the Structure of a Mg−Al−CO₃ Layered Double Hydroxide: Sorption Reversibility Aspects

Kim

Yang

Liu

et al. 2004

Ind. Eng. Chem. Res.

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“…Lithium ferrite, ¡-LiFeO 2 is suitable for the efficient separation of CO 2 from hot flue gases with high CO 2 concentrations at middle temperatures 6) since it readily reacts with CO 2 to produce Li 2 4 12) and CaO. 13)16) However ¡-LiFeO 2 has a relatively low CO 2 absorption rate.…”

Section: )5)mentioning

confidence: 99%

CO2 absorption of CeO2-coated .ALPHA.-LiFeO2

Yanase

Hirofumi

Kobayashi

2011

J. Ceram. Soc. Japan

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¡-LiFeO 2 columnar particles were synthesized by heating a mixture of £-Fe 2 O 3 and LiNO 3 at 500°C in air. CeO 2 nanoparticles were prepared from Ce(OH) 3 obtained by a precipitation method. The ¡-LiFeO 2 columnar particles were mixed with the CeO 2 nanoparticles in an aqueous solution and then the mixture of ¡-LiFeO 2 and CeO 2 was heated at 300°C to prepare the ¡-LiFeO 2 coated with CeO 2 nanoparticles. Then the effect of CeO 2 coating on CO 2 absorption ability of ¡-LiFeO 2 was investigated. As a result, coating of CeO 2 on ¡-LiFeO 2 particles was found to suppress the structural phase transition of ¡-LiFeO 2 to ¢¤-LiFeO 2 , although the synthesized ¡-LiFeO 2 underwent a structural phase transition of ¡-LiFeO 2 to ¢¤-LiFeO 2 accompanied by the reaction of ¡-LiFeO 2 with CO 2 in the temperature range of 350 to 425°C. The suppression of the structural phase transition resulted in an increase in CO 2 absorption rate of LiFeO 2 in the temperature range up to 425°C. Thermodynamic analysis revealed that the ¡-LiFeO 2 phase has a lower activation energy for CO 2 diffusion than the ¢¤-LiFeO 2 phase, which results in the enhancement of the CO 2 absorption rate of LiFeO 2 .

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“…Although there are several ways of producing hydrogen, one of the most widely used methods is by steam reforming hydrocarbons. While hydrogen can also be generated by gasifying coal or biomass, the hydrogen content of the raw gas is low because of the presence of other gases such as CO, CO 2 , CH 4 , and N 2 . The hydrogen content of such mixtures can be increased by applying a combination of the steam reforming reaction, and the water-gas shift reaction:…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4][5] Laboratory-scale demonstrations of such a process were conducted with beds composed of crushed commercial nickel-based reforming catalysts and sorbent particles selected for removing CO 2 from the reaction mixture. Different sorbents were used including calcium oxide and a potassium carbonate promoted hydrotalcite.…”

Section: Introductionmentioning

confidence: 99%

Development of a Novel Combined Catalyst and Sorbent for Hydrocarbon Reforming

Satrio

Shanks

Wheelock

2005

Ind. Eng. Chem. Res.

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A combined catalyst and sorbent was prepared and utilized for steam reforming methane and propane in laboratory-scale systems. The material was prepared in the form of small spherical pellets having a layered structure such that each pellet consisted of a highly reactive lime or dolime core enclosed within a porous but strong protective shell made of alumina in which a nickel catalyst was loaded. The material served two functions by catalyzing the reaction of hydrocarbons with steam to produce hydrogen while simultaneously absorbing carbon dioxide formed by the reaction. The in situ removal of CO 2 shifted the reaction equilibrium toward increased H 2 concentration and production. The concept was proved by using both a thermogravimetric analyzer and a fixed-bed reactor loaded with the material to reform hydrocarbons. Tests conducted with the fixed-bed reactor at atmospheric pressure and with temperatures in the range of 520-650Â°C produced a product containing a large concentration of H 2 (e.g., 94-96 mol %) and small concentration of CO and CO 2. Therefore, the results achieved in a single step were as good as or better than those achieved in a conventional multistep reaction and separation process. A combined catalyst and sorbent was prepared and utilized for steam reforming methane and propane in laboratory-scale systems. The material was prepared in the form of small spherical pellets having a layered structure such that each pellet consisted of a highly reactive lime or dolime core enclosed within a porous but strong protective shell made of alumina in which a nickel catalyst was loaded. The material served two functions by catalyzing the reaction of hydrocarbons with steam to produce hydrogen while simultaneously absorbing carbon dioxide formed by the reaction. The in situ removal of CO 2 shifted the reaction equilibrium toward increased H 2 concentration and production. The concept was proved by using both a thermogravimetric analyzer and a fixed-bed reactor loaded with the material to reform hydrocarbons. Tests conducted with the fixed-bed reactor at atmospheric pressure and with temperatures in the range of 520-650°C produced a product containing a large concentration of H 2 (e.g., 94-96 mol %) and small concentration of CO and CO 2 . Therefore, the results achieved in a single step were as good as or better than those achieved in a conventional multistep reaction and separation process.

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Sorption‐enhanced reaction process for hydrogen production

Cited by 467 publications

References 5 publications

Thermal Evolution of the Structure of a Mg−Al−CO₃ Layered Double Hydroxide: Sorption Reversibility Aspects

Thermal Evolution of the Structure of a Mg−Al−CO₃ Layered Double Hydroxide: Sorption Reversibility Aspects

CO2 absorption of CeO2-coated .ALPHA.-LiFeO2

Development of a Novel Combined Catalyst and Sorbent for Hydrocarbon Reforming

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Sorption‐enhanced reaction process for hydrogen production

Cited by 467 publications

References 5 publications

Thermal Evolution of the Structure of a Mg−Al−CO3 Layered Double Hydroxide: Sorption Reversibility Aspects

Thermal Evolution of the Structure of a Mg−Al−CO3 Layered Double Hydroxide: Sorption Reversibility Aspects

CO2 absorption of CeO2-coated .ALPHA.-LiFeO2

Development of a Novel Combined Catalyst and Sorbent for Hydrocarbon Reforming

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Product

Resources

About

Thermal Evolution of the Structure of a Mg−Al−CO₃ Layered Double Hydroxide: Sorption Reversibility Aspects

Thermal Evolution of the Structure of a Mg−Al−CO₃ Layered Double Hydroxide: Sorption Reversibility Aspects