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CO2 capture at low temperatures (30-80 °C) and in the presence of water vapor over a thermally activated Mg-Al layered double hydroxide.
Torres-Rodríguez, Daniela A; Lima, Enrique; Valente, Jaime S; Pfeiffer, Heriberto.
Afiliação
  • Torres-Rodríguez DA; Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Del. Coyoacán, México DF, Mexico.
J Phys Chem A ; 115(44): 12243-50, 2011 Nov 10.
Article em En | MEDLINE | ID: mdl-21936518
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.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Qualitative_research Idioma: En Revista: J Phys Chem A Assunto da revista: QUIMICA Ano de publicação: 2011 Tipo de documento: Article País de afiliação: México País de publicação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Qualitative_research Idioma: En Revista: J Phys Chem A Assunto da revista: QUIMICA Ano de publicação: 2011 Tipo de documento: Article País de afiliação: México País de publicação: Estados Unidos