Chemisorption of H2O and CO2 on Hydrotalcites for Sorption-enhanced Water-gas-Shift Processes. (July 2017)

• Record Type: Journal Article
• Authors: Coenen, K.; Gallucci, F.; Cobden, P.; van Dijk, E.; Hensen, E.J.M.; Annaland, M. van Sint
• Is Part Of: Energy procedia. Volume 114(2017)
• Page Start: 2228
• Page End: 2242
• Publication Date: 2017-07
• Subjects: Hydrotalcite -- model for cyclic working capacity -- CO2 capture; Power resources -- Congresses; Power resources -- Periodicals; Power resources; Conference proceedings; Periodicals; 333.7905
• DOI: 10.1016/j.egypro.2017.03.1360
• Languages: English
• ISSNs: 1876-6102

Abstract

Abstract: Thermogravimetric analysis and breakthrough experiments in a packed bed reactor were used to validate a developed adsorption model to describe the cyclic working capacity of CO2 and H2 O on a potassium-promoted hydrotalcite, a very promising adsorbent for sorption-enhanced water-gas-shift applications. Four different adsorption sites (two sites for CO2, one site for H2 O and one equilibrium site for both species) were required to describe the mass changes observed in the TGA experiments. The TGA experiments were carried out at operating temperatures between 300 and 500 °C, while the total pressure in the reactor was kept at atmospheric pressure. Cyclic working capacities for different sites and the influence of the operating conditions on the cyclic working capacity were studied using the developed model. A higher operating temperature leads to a significant increase in the cyclic working capacity of the sorbent for CO2 attributed to the increase in the desorption kinetics for CO2 . The model was successfully validated with experiments in a packed bed reactor at different operating temperatures.