29817-79-6Relevant articles and documents
Synthesis and characterization of (Z)-[N3NFO]+ and (E)-[N3NFO]+
Wilson, William W.,Haiges, Ralf,Boatz, Jerry A.,Christe, Karl O.
, p. 3023 - 3027 (2007)
(Figure Presented) A new stable polynitrogen ion: The second known example of a stable nitrogen fluoride oxide ion, [N3NFO]+, was prepared as its [SbF6]- salt and characterized by multinuclear NMR and vibrational spectroscopy and electronic-structure calculations. The cation is planar and exists as two stereoisomers (see picture; N blue, O red, F dark blue).
Diversion of Catalytic C-N Bond Formation to Catalytic Oxidation of NH3 through Modification of the Hydrogen Atom Abstractor
Bullock, R. Morris,Dunn, Peter L.,Johnson, Samantha I.,Kaminsky, Werner
supporting information, p. 3361 - 3365 (2020/03/06)
We report that (TMP)Ru(NH3)2 (TMP = tetramesitylporphryin) is a molecular catalyst for oxidation of ammonia to dinitrogen. An aryloxy radical, tri-tert-butylphenoxyl (ArO·), abstracts H atoms from a bound ammonia ligand of (TMP)Ru(NH3)2, leading to the discovery of a new catalytic C-N coupling to the para position of ArO· to form 4-amino-2,4,6-tri-tert-butylcyclohexa-2,5-dien-1-one. Modification of the aryloxy radical to 2,6-di-tert-butyl-4-tritylphenoxyl radical, which contains a trityl group at the para position, prevents C-N coupling and diverts the reaction to catalytic oxidation of NH3 to give N2. We achieved 125 ± 5 turnovers at 22 °C for oxidation of NH3, the highest turnover number (TON) reported to date for a molecular catalyst.
Promoting effect of CeO2 on the catalytic activity of Ba-Y2O3for direct decomposition of NO
Doi, Yasuyuki,Haneda, Masaaki,Ozawa, Masakuni
, p. 117 - 123 (2015/01/30)
The effect of CeO2 additive on the catalytic performance of Ba-Y2O3 prepared by coprecipitaion for the direct decomposition of NO was investigated. Although Ba-Y2O3 effectively catalyzed NO decomposition, its activity was clearly increased by addition of CeO2. The optimum CeO2 content was 10 mol%. CO2-TPD measurement revealed that the addition of CeO2 into Ba-Y2O3 caused an increase in the CO2 desorption peak in the temperature range of 473 and 723K derived from highly dispersed Ba species. The predominant role of CeO2 additive was suspected to effectively create the highly dispersed Ba species as catalytically active sites. Kinetic studies of NO decomposition on Ba-CeO2(10)-Y2O3 suggested that coexisting O2 suppresses the NO decomposition reaction by competitive adsorption. Isotopic transient kinetic analysis suggested a reaction pathway in which the surface NOx adspecies act as reaction intermediates for the formation of N2 in NO decomposition over Ba-CeO2-Y2O3. We concluded that CeO2 additive does not directly participate in the NO decomposition reaction as catalytically active species.
Regeneration mechanism of a Lean NOx Trap (LNT) catalyst in the presence of NO investigated using isotope labelling techniques
Pereda-Ayo, Benat,Gonzalez-Velasco, Juan R.,Burch, Robbie,Hardacre, Christopher,Chansai, Sarayute
, p. 177 - 186 (2012/02/06)
The presence of NO during the regeneration period of a Pt-Ba/Al 2O3 Lean NOx Trap (LNT) catalyst modifies significantly the evolution of products formed from the reduction of stored nitrates, particularly nitrogen and ammonia. The use of isotope labelling techniques, feeding 14NO during the storage period and 15NO during regeneration allows us to propose three different routes for nitrogen formation based on the different masses detected during regeneration, i.e. 14N2 (m/e = 28), 14N 15N (m/e = 29) and 15N2 (m/e = 30). It is proposed that the formation of nitrogen via Route 1 involves the reaction between hydrogen and 14NOx released from the storage component to form 14NH3 mainly. Then, ammonia further reacts with 14NOx located downstream to form 14N2. In Route 2, it is postulated that the incoming 15NO reacts with hydrogen to form 15NH3 in the reactor zone where the trap has been already regenerated. This isotopically labelled ammonia travels through the catalyst bed until it reaches the regeneration front where it participates in the reduction of stored nitrates (14NOx) to form 14N15N. The formation of 15N2 via Route 3 is believed to occur by the reaction between incoming 15NO and H2. The modification of the hydrogen concentration fed during regeneration affects the relative importance of H2 or 15NH3 as reductants and thus the production of 14N2 via Route 1 and 14N15N via Route 2.
