32122-44-4Relevant articles and documents
Carbenes in constrained systems. 4. Encapsulation of an asymmetric diazirine: Reactivity of 2-methylcyclohexanylidene
Rosenberg,Kam,Brinker
, p. 3235 - 3238 (1996)
2-Methylcyclohexanylidene was generated from the corresponding diazirine within the cavities of α-, β- and γ-cyclodextrin by photolysis in the solid state. To surmise how these constrained systems affect the residing carbene's selectivity, a comparison with conventional reaction methods was made.
Pt nanoparticle supported on nanocrystalline CeO2: Highly selective catalyst for upgradation of phenolic derivatives present in bio-oil
Sarkar, Bipul,Pendem, Chandrashekar,Konathala, L. N. Sivakumar,Sasaki, Takehiko,Bal, Rajaram
, p. 18398 - 18404 (2015/02/19)
Pt nanoparticle supported on nanocrystalline CeO2 was prepared, and it was found that the catalyst can selectively hydrogenate phenolic derivatives present in bio-oil. The catalyst was characterized by XRD, XPS, ICP-AES, EXAFS, SEM and TEM. TEM micrograms confirm the presence of very small Pt nanoparticles supported on nanocrystalline CeO2. The catalyst was found to be very effective in liquid phase hydrogenation of phenol and phenolic compounds present in bio-oil in the presence of molecular H2. The synergy between the surface and very small Pt particles on the nanocrystalline CeO2 plays the most vital role towards the extremely high catalytic activity of the catalyst. The reusability of the catalyst was tested, and it was found that the catalyst does not exhibit any significant change in its catalytic activity even after five reuses. The catalyst showed ～100% conversion with very high selectivity after 3 h in phenol conversions of 100% with >98% cyclohexanol selectivity achieved after 3 h of reaction at 100 °C in aqueous medium.
Ligand effect in the Rh-NP catalysed partial hydrogenation of substituted arenes
Castelbou, Jessica Llop,Gual, Aitor,Mercade, Elisabet,Claver, Carmen,Godard, Cyril
, p. 2828 - 2833 (2013/09/24)
The Rh nanoparticles Rh1-Rh4 stabilised by the mono- and bidentate phosphine and phosphite ligands I-IV were synthesised, characterised and applied as catalysts in the partial hydrogenation of substituted arenes. In the case of disubstituted arenes, selectivities for the corresponding cyclohexene derivatives of up to 39% were achieved at ca. 40% conversion. The effect of parameters such as temperature and pressure was also examined. In the hydrogenation of styrene, very high selectivities for ethylbenzene were achieved with TOF values up to ca. 23500 h-1. All these results show that the catalytic performance of small Rh-NPs can be modulated by the appropriate choice of stabilising agents.
