title: Slow release of NO by microporous titanosilicate ETS-4.
abstract: A novel approach to designing nitric oxide (NO) storage and releasing microporous agents based on very stable, zeolite-type silicates possessing framework unsaturated transition-metal centers has been proposed. This idea has been illustrated with ETS-4 [Na(9)Si(12)Ti(5)O(38)(OH)·xH(2)O], a titanosilicate that displays excellent NO adsorption capacity and a slow releasing kinetics. The performance of these materials has been compared to the performance of titanosilicate ETS-10, [(Na,K)(2)Si(5)TiO(13)·xH(2)O], of benchmark zeolites mordenite and CaA, and of natural and pillared clays. DFT periodic calculations have shown that the presence of water in the pores of ETS-4 promotes the NO adsorption at the unsaturated (pentacoordinated) Ti(4+) framework ions.
authors: Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal.
authors: Moisés L
authors: ML
authors: Pinto
authors: João
authors: J
authors: Rocha
authors: José R B
authors: JR
authors: Gomes
authors: João
authors: J
authors: Pires
mesh_terms: D000327:Adsorption; D008958:Models, Molecular; D009569:Nitric Oxide / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D014025:Titanium / Q000737:chemistry*
chemical_list: D017640:Silicates; D009569:Nitric Oxide; D014025:Titanium