Leyva-Perez A.,Technical University Valencia Consejo Superior Of Investigaciones Cientficas |
Vidal-Moya J.A.,Technical University Valencia Consejo Superior Of Investigaciones Cientficas |
Cabrero-Antonino J.R.,Technical University Valencia Consejo Superior Of Investigaciones Cientficas |
Al-Deyab S.S.,King Saud University |
And 3 more authors.
Journal of Organometallic Chemistry | Year: 2011
Hydrophosphination of styrenes has been accomplished with metal salts for the first time. (CuOTf)2·toluene complex is the catalyst of choice, but CuCl can also be used. "In-situ" EPR and NMR studies suggest Cu(I) as the catalytically active metal species, giving exclusively the anti-Markovnikov product. Phosphine oxides or β-ketophosphine oxides can be prepared in one-pot by oxidation with molecular oxygen. © 2010 Elsevier B.V. All rights reserved.
PubMed | Technical University Valencia Consejo Superior Of Investigaciones Cientficas
Type: Journal Article | Journal: The journal of physical chemistry letters | Year: 2015
Nowadays, the most attractive technology for the elimination of nitric oxides from the exhaust gas of diesel vehicles is the selective catalytic reduction with ammonia (NH3-SCR-NOx) using Cu zeolite with the chabazite structure as the catalyst. Isolated copper species are the active sites, but the reaction intermediates and the overall reaction mechanism are still under debate. Here, we study the interaction of ammonia with zeolite Cu-SSZ-13 (CHA topology) with a uniform distribution of Cu(2+) sites prepared in one pot and a conventional Cu-ZSM-5 (MFI topology) for comparison. In situ EPR and solid-state NMR spectroscopies combined with DFT calculations have allowed the identification of NH4(+), [Cu(NH3)5](2+), [Cu(Of)2(NH3)2](2+), [Cu(Of)3NH3](2+), [Cu(NH3)2](+), and [CuOf(NH3)](+) (Of being framework oxygen) under different conditions. The results demonstrate that ammonia is able to reduce Cu(2+) to Cu(+) and provide new information on the species formed in Cu-SSZ-13, which have important implications for the elucidation of the SCR reaction mechanism.