CO2 capture at low temperatures (30-80 °C) and in the presence of water vapor over a thermally activated Mg-Al layered double hydroxide

Daniela A Torres-Rodríguez; Enrique Lima; Jaime S Valente; Heriberto Pfeiffer

doi:10.1021/jp207836m

CO2 capture at low temperatures (30-80 °C) and in the presence of water vapor over a thermally activated Mg-Al layered double hydroxide

J Phys Chem A. 2011 Nov 10;115(44):12243-50. doi: 10.1021/jp207836m. Epub 2011 Oct 13.

Authors

Daniela A Torres-Rodríguez¹, Enrique Lima, Jaime S Valente, Heriberto Pfeiffer

Affiliation

¹ Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Del. Coyoacán, México DF, Mexico.

PMID: 21936518
DOI: 10.1021/jp207836m

Abstract

The carbonation process of a calcined Mg-Al layered double hydroxide (LDH) was systematically analyzed at low temperatures, varying the relative humidity. Qualitative and quantitative experiments were performed. In a first set of experiments, the relative humidity was varied while maintaining a constant temperature. Characterization of the rehydrated products by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR) and solid-state NMR revealed that the samples did not recover the LDH structure; instead hydrated MgCO(3) was produced. The results were compared with similar experiments performed on magnesium oxide for comparison purposes. Then, in the second set of experiments, a kinetic analysis was performed. The results showed that the highest CO(2) capture was obtained at 50 °C and 70% of relative humidity, with a CO(2) absorption capacity of 2.13 mmol/g.