Journal
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
Volume 95, Issue 10, Pages 1842-1849Publisher
WILEY
DOI: 10.1002/cjce.22877
Keywords
in-situ water separation; sorption-enhanced reaction process; zeolites; adsorption
Categories
Funding
- Natural Sciences and Engineering Research Council (NSERC), Canada
- Fonds de recherche du Quebec - Nature et technologies (FRQNT)
- Region Auvergne-Rhone-Alpes (France)
- Accueil Pro CMIRA program
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An attractive approach to reduce anthropogenic emission of carbon dioxide (CO2) would be to valorize it into value-added products (e.g. alcohols or dimethylether) by chemical recycling. However, in most of these important reactions, water is produced as a byproduct that limits CO2 conversion thermodynamically and can lead to the deactivation of catalysts. Water removal in sorption-enhanced reaction process (SERP) would allow the overcoming of these drawbacks and several zeolites (SOD, LTA, and FAU) have been selected to assess their potential to adsorb water in-situ at high temperatures. This work aims to study the water adsorption capacity and kinetics in a large temperature range of 25-250 degrees C and evaluate the potential of the selected adsorbents for in-situ water removal in the reverse water gas shift (RWGS) reaction. For all zeolites, the water uptake showed an important decrease at higher temperatures but the capacity at 250 degrees C was still significant. While the poor adsorption kinetics of SOD limit its use, FAU-13X powder gave better results than LTA-4A, which were confirmed by a more important increase of CO concentration at the exit of the reactor for the RWGS reaction. Transient adsorption data obtained in this study were fitted by a double stretched equation and the kinetic constants were determined. These results are essential to model and design an efficient SERP process and determine the optimal reaction conditions.
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