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Investigation of the Enhanced Water Gas Shift Reaction Using Natural and Synthetic Sorbents for the Capture of CO2 / Christoph R. Müller in Industrial & engineering chemistry research, Vol. 48 N° 23 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10284–10291 Titre : Investigation of the Enhanced Water Gas Shift Reaction Using Natural and Synthetic Sorbents for the Capture of CO2 Type de document : texte imprimé Auteurs : Christoph R. Müller, Auteur ; Roberta Pacciani, Auteur ; Christopher D. Bohn, Auteur Année de publication : 2010 Article en page(s) : pp. 10284–10291 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Investigation--Enhanced--Water  Gas--Shift  Reaction--Using  Natural--Synthetic  Sorbents--Capture--CO2 Résumé : The water gas shift (WGS) reaction was conducted in the presence of two natural and two synthetic CaO-based sorbents. It was shown that such sorbents can affect the WGS in two ways: (i) by catalysis of the reaction and (ii) by altering the equilibrium position by abstraction of CO2 from the gas phase. It was shown that CaO can significantly enhance the production of H2 during the WGS reaction; however, a trade-off between the production of H2 and contamination of the product gas with CO2 (the “CO2 slip”) has to be made. It was found that CaO catalyzes the WGS reaction. The carbonation reaction was very close to thermodynamic equilibrium, even at small contact times at 650 °C. However, the concentration of H2 was significantly below that predicted from equilibrium considerations. In our experiments, once the sorbent had been fully carbonated, it was regenerated by heating to release the CO2 so that it could be reused. In such a cyclic experiment, calcium magnesium acetate, a synthetic sorbent, was the best sorbent tested, albeit only over five cycles of reaction, with respect to the amount of H2 produced. The other sorbents, especially limestone, revealed a decrease in the production of hydrogen with the number of cycles. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900772q [article] Investigation of the Enhanced Water Gas Shift Reaction Using Natural and Synthetic Sorbents for the Capture of CO2 [texte imprimé] / Christoph R. Müller, Auteur ; Roberta Pacciani, Auteur ; Christopher D. Bohn, Auteur . - 2010 . - pp. 10284–10291. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10284–10291 Mots-clés : Investigation--Enhanced--Water  Gas--Shift  Reaction--Using  Natural--Synthetic  Sorbents--Capture--CO2 Résumé : The water gas shift (WGS) reaction was conducted in the presence of two natural and two synthetic CaO-based sorbents. It was shown that such sorbents can affect the WGS in two ways: (i) by catalysis of the reaction and (ii) by altering the equilibrium position by abstraction of CO2 from the gas phase. It was shown that CaO can significantly enhance the production of H2 during the WGS reaction; however, a trade-off between the production of H2 and contamination of the product gas with CO2 (the “CO2 slip”) has to be made. It was found that CaO catalyzes the WGS reaction. The carbonation reaction was very close to thermodynamic equilibrium, even at small contact times at 650 °C. However, the concentration of H2 was significantly below that predicted from equilibrium considerations. In our experiments, once the sorbent had been fully carbonated, it was regenerated by heating to release the CO2 so that it could be reused. In such a cyclic experiment, calcium magnesium acetate, a synthetic sorbent, was the best sorbent tested, albeit only over five cycles of reaction, with respect to the amount of H2 produced. The other sorbents, especially limestone, revealed a decrease in the production of hydrogen with the number of cycles. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900772q

Production of very pure hydrogen with simultaneous capture of carbon dioxide using the redox reactions of iron oxides in packed beds / Christopher D. Bohn in Industrial & engineering chemistry research, Vol. 47 N°20 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7623-7630 Titre : Production of very pure hydrogen with simultaneous capture of carbon dioxide using the redox reactions of iron oxides in packed beds Type de document : texte imprimé Auteurs : Christopher D. Bohn, Editeur scientifique ; Christoph R. Müller, Editeur scientifique ; Jason P. Cleeton, Editeur scientifique Année de publication : 2008 Article en page(s) : P. 7623-7630 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Hydrogen  Carbon  dioxide  Oxides  H2  CO2 Résumé : A chemical looping process, which uses a packed bed of the various oxides of iron, has been formulated to produce separate, pure streams of H2 and CO2 from syngas. The process has the following stages: (1) Reduction of Fe2O3 to Fe0.947O in the syngas from gasifying coal or biomass. This stage generates pure CO2, once the water has been condensed. (2) Subsequent oxidation of Fe0.947O to Fe3O4 using steam, to simultaneously produce H2. (3) Further oxidation of Fe3O4 to Fe2O3 using air to return the oxide to step 1. Step 1 was studied here using a mixture of CO + CO2 + N2 as the feed to a packed bed of iron oxide particles, while measuring the concentrations of CO and CO2 in the off-gas; step 2 was investigated by passing steam in N2 through the packed bed and measuring the quantity of H2 produced. The third step simply involved passing air through the bed. Reduction to Fe, rather than Fe0.947O, in step 1 gave low levels of H2 in step 2 after 10 cycles of reduction and oxidation and led to the deposition of carbon at lower temperature. Step 3, i.e. reoxidizing the particles in air to Fe2O3, led to no deterioration of the hydrogen yield in step 2 and benefited the process by (i) increasing the heat produced in each redox cycle and (ii) preventing the slip of CO from the bed in step 1. The proposed process is exothermic overall and very usefully generates separate streams of very pure H2 and CO2 without complicated separation units. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800335j [article] Production of very pure hydrogen with simultaneous capture of carbon dioxide using the redox reactions of iron oxides in packed beds [texte imprimé] / Christopher D. Bohn, Editeur scientifique ; Christoph R. Müller, Editeur scientifique ; Jason P. Cleeton, Editeur scientifique . - 2008 . - P. 7623-7630. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7623-7630 Mots-clés : Hydrogen  Carbon  dioxide  Oxides  H2  CO2 Résumé : A chemical looping process, which uses a packed bed of the various oxides of iron, has been formulated to produce separate, pure streams of H2 and CO2 from syngas. The process has the following stages: (1) Reduction of Fe2O3 to Fe0.947O in the syngas from gasifying coal or biomass. This stage generates pure CO2, once the water has been condensed. (2) Subsequent oxidation of Fe0.947O to Fe3O4 using steam, to simultaneously produce H2. (3) Further oxidation of Fe3O4 to Fe2O3 using air to return the oxide to step 1. Step 1 was studied here using a mixture of CO + CO2 + N2 as the feed to a packed bed of iron oxide particles, while measuring the concentrations of CO and CO2 in the off-gas; step 2 was investigated by passing steam in N2 through the packed bed and measuring the quantity of H2 produced. The third step simply involved passing air through the bed. Reduction to Fe, rather than Fe0.947O, in step 1 gave low levels of H2 in step 2 after 10 cycles of reduction and oxidation and led to the deposition of carbon at lower temperature. Step 3, i.e. reoxidizing the particles in air to Fe2O3, led to no deterioration of the hydrogen yield in step 2 and benefited the process by (i) increasing the heat produced in each redox cycle and (ii) preventing the slip of CO from the bed in step 1. The proposed process is exothermic overall and very usefully generates separate streams of very pure H2 and CO2 without complicated separation units. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800335j