ORPTION STUDY ON ALKALI ZIRCONATE BASED SORBENTS IN PRESENCE OF STEAM AND LOW CO2 CONCENTRATION

DIANA PELTZER; JOHN MÚNERA; CORNAGLIA, LAURA

Cancún

Congreso; XXIX International Materials Research Congress; 2021

Sociedad Mexicana de Materiales (SMMater) y Materials Research Society® (MRS)

CO2 capture at high temperature (>500 ºC) is one of the approaches to reduce CO2 emissions, and is based on the utilization of solid materials reacting with CO2 through the carbonation reaction. Alkali ceramics are stable compounds with good carbonation properties. Due to CO2 capture can be used for decarbonation of combustion gases or coupled with reforming systems, sorbents must present good capture properties in presence of H2O and low CO2 (5-30%) concentrations. This contribution presents the effect of steam on sorption properties of Li, K, and Na zirconate-based materials reacting with 15% CO2.Li2ZrO3, K-doped Li2ZrO3, and mixed Li2ZrO3-Na2ZrO3 based sorbents, labeled as LiZr, KLiZr, and NaLiZr, respectively, were synthesized through wet impregnation of alkaline solutions in a suspension of zirconia nanoparticles (NYACOL®). Calculated theoretical capture capacities were 0.251, 0.249, and 0.233 gCO2.gmat-1 for LiZr, KLiZr, and NaLiZr, respectively. Structural Raman and XRD characterization was performed. Sorption tests were carried out in a fixed-bed reactor coupled to a CO2-detection system. Zirconate reactivity was analyzed through operando Raman experiments, coupling in situ Raman spectroscopy with mass spectrometry.