Supported ionic liquid phase (SILP) materials for removal of hazardous gas compounds - efficient and irreversible NH sub(3) adsorption

• Published in: Green chemistry : an international journal and green chemistry resource : GC Vol. 16; no. 7; pp. 3560 - 3568
• Main Authors: Kohler, Florian TU, Popp, Sabine, Klefer, Heiko, Eckle, Ilsebill, Schrage, Christian, Bohringer, Bertram, Roth, Daniel, Haumann, Marco, Wasserscheid, Peter
• Format: Journal Article
• Language: English
• Published: 01.06.2014
• Subjects: Ammonia; Cyclohexane; Gas flow; Ionic liquids; Purification; Surface chemistry; Thin films
• ISSN: 1463-9262; 1463-9270
• DOI: 10.1039/c3gc42275e

Novel supported ionic liquid phase (SILP) gas purification materials have been developed to remove ammonia irreversibly from an ambient gas flow of nitrogen (1000 ppm NH sub(3) in N sub(2), wet and dry). In the applied SILP materials, thin films of imidazolium based ionic liquids and ionic solutions of metal complexes, namely [C sub(8)C sub(1)Im][NTf sub(2)], [C sub(8)C sub(1)Im][NTf sub(2)]/Cu(NTf sub(2)) sub(2), [C sub(8)C sub(1)Im][NTf sub(2)]/Co(NTf sub(2)) sub(2) and [C sub(n)C sub(1)Im]Cl/CuCl sub(2) (n= 2, 4, 8), were dispersed onto the large surface area of polymer-based spherical activated carbon supports. For the [C sub(n)C sub(1)Im]Cl/CuCl sub(2) (n= 2, 4, 8) based SILP materials the use of a humid gas flow significantly enhances NH sub(3) absorption as demonstrated by a clear increase of breakthrough times. The irreversibility of the ammonia sorption and the broadband capability (e.g. Cl sub(2), H sub(2)S and cyclohexane) of the prepared SILP absorber materials are reported and compared to typical standards for gas purification adsorber materials (ABEK regulations).