title: CO2 capture at low temperatures (30-80 °C) and in the presence of water vapor over a thermally activated Mg-Al layered double hydroxide.
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.
authors.affiliation: Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Del. Coyoacán, México DF, Mexico.
authors.forename: Daniela A
authors.initials: DA
authors.lastname: Torres-Rodríguez
authors.forename: Enrique
authors.initials: E
authors.lastname: Lima
authors.forename: Jaime S
authors.initials: JS
authors.lastname: Valente
authors.forename: Heriberto
authors.initials: H
authors.lastname: Pfeiffer