Supported Layered Double Hydroxides as CO2 Adsorbents for Sorption-enhanced H2 Production

 Previously published in hardcover
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Previously published in hardcover
Diana Iruretagoyena Ferrer
380 g
235x155x13 mm
Nominated as an outstanding Ph.D. thesis by Imperial College London, UKPresents a combination of material synthesis and characterization with process modelingOutlines the equilibria and kinetics of CO2 adsorption on novel supported hydrotalcitesProvides a thorough and extensive literature review
Introduction.- Literature Review.- Experimental Methods.- Layered Double Hydroxides Supported on Multi-Walled Carbon Nanotubes.- Layered Double Hydroxides Supported on Graphene Oxide for CO2 Adsorption.- Influence of Alkali Metals on Layered Double Hydroxides Supported on Graphene Oxide for CO2 Adsorption.- CO2 Adsorption on Unsupported and Graphene Oxide Supported Layered Double Hydroxides in a Fixed-Bed.- Sorption-Enhanced Methanol-to-Shift for H2 Production: Thermodynamics and Catalyst Selection.- Conclusions and Future Work.
This thesis presents a combination of material synthesis and characterization with process modeling. In it, the CO2 adsorption properties of hydrotalcites are enhanced through the production of novel supported hybrids (carbon nanotubes and graphene oxide) and the promotion with alkali metals. Hydrogen is regarded as a sustainable energy carrier, since the end users produce no carbon emissions. However, given that most of the hydrogen produced worldwide comes from fossil fuels, its potential as a carbon-free alternative depends on the ability to capture the carbon dioxide released during manufacture. Sorption-enhanced hydrogen production, in which CO2 is removed as it is formed, can make a major contribution to achieving this. The challenge is to find solid adsorbents with sufficient CO2 capacity that can work in the right temperature window over repeated adsorption-desorption cycles. The book presents a highly detailed characterization of the materials, together with an accurate measurement of their adsorption properties under dry conditions and in the presence of steam. It demonstrates that even small quantities of graphene oxide provide superior thermal stability to hydrotalcites due to their compatible layered structure, making them well suited as volume-efficient adsorbents for CO2. Lastly, it identifies suitable catalysts for the overall sorption-enhanced water gas shift process.