Services on Demand
Journal
Article
Indicators
- Cited by SciELO
- Access statistics
Related links
- Cited by Google
- Similars in SciELO
- Similars in Google
Share
Revista Facultad de Ingeniería Universidad de Antioquia
Print version ISSN 0120-6230On-line version ISSN 2422-2844
Abstract
ORREGO ROMERO, Andrés; MONTES DE CORREA, Consuelo and BUSTAMANTE LODONO, Felipe. Preparation and characterization of Mg-modified zirconias as catalysts for the direct synthesis of dimethyl carbonate (DMC). Rev.fac.ing.univ. Antioquia [online]. 2011, n.57, pp.14-22. ISSN 0120-6230.
In this work sol-gel zirconia was prepared using H2SO4, HNO3 or HCl as hydrolysis catalysts. Basic and acid sites of synthesized zirconia materials were characterized by XRD, BET, FTIR, CO2- TPD and NH3-TPD. FTIR spectra and TGA confirmed the presence of sulfate in the structure of samples prepared with H2SO4 as hydrolysis catalyst. Different molar ratios of Mg were incorporated by co-gellation on selected zirconia materials in order to improve their basic properties. Mg loading was determined by elemental analysis. The resulting materials were tested for the direct synthesis of dimethyl carbonate (DMC) from methanol and CO2. The addition of Mg to zirconia samples prepared with HCl as hydrolysis catalyst increased their CO2 adsorption capacity between 100 and 200°C. However, methanol conversions on these samples were lower than over unmodified zirconia samples.
Keywords : Sol-gel process; zirconia; basic sites; dimethyl carbonate; CO2-TPD.