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MgO modified zeolite facilitated low temperature chemisorptive removal of gaseous acetaldehyde into value added intermediate as desorption product.
- Source :
-
Chemosphere [Chemosphere] 2021 Aug; Vol. 276, pp. 130281. Date of Electronic Publication: 2021 Mar 15. - Publication Year :
- 2021
-
Abstract
- The adsorptive removal of acetaldehyde is more compatible for real-world applications. However, it must be upgraded from simple adsorption to a high efficiency process with value added products. This study develops a modified zeolite with Mg <superscript>2+</superscript> ions that possesses acid-base sites for the removal of acetaldehyde at room temperature. Through a modified procedure, MgO is coated on commercial zeolite (13x), achieving a porosity of 501 m <superscript>2</superscript>  g <superscript>-1</superscript> with MgO particles of 100 nm and pore diameter of 2.6 nm, and high breakthrough capacity of 50.00 mg/g. The initial pH and concentration of Mg <superscript>2+</superscript> ion 12.5 and 0.2 M, respectively, with a maximum breakthrough capacity of 12.72 mg/g at 10% humidity. Significant variations in breakthrough capacity with respect to humidity in the presence of H <subscript>2</subscript> S and NH <subscript>3</subscript> demonstrate the effects of water and gases on adsorption efficiency. Desorptive oxidation of adsorbed acetaldehyde at 250 °C yielded a high molecular weight intermediate ethylene oxide formation. The oxidation is followed by aldol condensation and hydrogenation. The higher breakthrough capacity and the intermediate product yielded using the developed MgO-zeolite proves the acid-base reaction sites involved in acetaldehyde removal follows chemisorption and possible process scale-up.<br /> (Copyright © 2021 Elsevier Ltd. All rights reserved.)
- Subjects :
- Acetaldehyde
Gases
Magnesium Oxide
Temperature
Zeolites
Subjects
Details
- Language :
- English
- ISSN :
- 1879-1298
- Volume :
- 276
- Database :
- MEDLINE
- Journal :
- Chemosphere
- Publication Type :
- Academic Journal
- Accession number :
- 34088108
- Full Text :
- https://doi.org/10.1016/j.chemosphere.2021.130281