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International Journal of Chemical Reactor Engineering

Ed. by de Lasa, Hugo / Xu, Charles Chunbao

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Volume 13, Issue 2

CO2 Sorption-Enhanced Processes by Hydrotalcite-Like Compounds at Different Temperature Levels

K. Gallucci
  • Corresponding author
  • Department of Industrial Engineering, University of L’Aquila, via G. Gronchi 18, 67100 L’Aquila, Italy
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/ F. Micheli / D. Barisano
  • Department of Industrial Engineering, University of L’Aquila, via G. Gronchi 18, 67100 L’Aquila, Italy
  • Enea CR Trisaia, SS Jonica 106 – km 419 + 500, 75026 Rotondella, Matera, Italy
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/ A. Villone / P.U. Foscolo / L. Rossi
  • Department of Physical and Chemical Science, University of L’Aquila, via Vetoio (Coppito 1), 67100 L’Aquila, Italy
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Published Online: 2015-04-28 | DOI: https://doi.org/10.1515/ijcre-2014-0131

Abstract

The aim of this work is to identify solid sorbents for CO2 capture for coal and biomass syngas conditioning and cleaning by means of a sorption-enhanced reaction process. Hydrotalcite-like compounds (HTlcs) were synthesized with and without K2CO3 impregnation. Samples were characterized by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) and Barrett–Joyner–Halenda (BJH) porosimetry after synthesis and after capture tests, respectively. Sorption and desorption tests were performed in a fluidized bed reactor, under cyclic conditions, at two different temperature levels: 350/450°C and 600/700°C. At low temperature only the Mg–Al HTlcs K promoted samples showed stability and sorption capacity comparable with literature values. On the other hand, results at high temperature indicate that the mixed Mg-Ca-Al HTlcs samples exhibit the best behavior with the highest sorption capacity (1.7 mmolCO2/g) almost stable over 5 sorption/regeneration cycles; furthermore, addition of steam allowed increasing their reactivity by 70% compared to the dry value. This type of sorbent could be a promising candidate to prepare a bifunctional sorbent–catalyst for sorption-enhanced processes, taking place directly in the fluidized bed gasifier, or downstream the reactor for adjustment of gas composition before further conversion in gaseous energy carriers.

Keywords: CO2 sorption-enhanced processes; process intensification; hydrotalcite-like compounds; bifunctional sorbent–catalyst

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About the article

Published Online: 2015-04-28

Published in Print: 2015-06-01


Citation Information: International Journal of Chemical Reactor Engineering, Volume 13, Issue 2, Pages 143–152, ISSN (Online) 1542-6580, ISSN (Print) 2194-5748, DOI: https://doi.org/10.1515/ijcre-2014-0131.

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