- N,N-Dimethylformamide-protected Fe2O3 Combined with Pt Nanoparticles: Characterization and Catalysis in Alkene Hydrosilylation
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We report a combination of N,N-dimethylformamide (DMF)-protected Fe2O3 nanoparticles (NPs) and Pt NPs for the hydrosilylation of various industrially relevant alkenes and tertiary silanes. The DMF-protected Fe2O3 and Pt NPs catalysts were characterized by transmission electron microscopy, X-ray absorption spectroscopy, and X-ray photoelectron spectroscopy. The catalyst of DMF-protected Fe2O3 NPs combined with Pt NPs can be recycled for five cycles by a simple extraction using hexane/DMF. The developed combination Fe2O3/Pt NPs catalyst is effective up to the 1-kilogram scale.
- Kanda, Yasuharu,Kondo, Ryota,Lin, Xianjin,Nagata, Tatsuki,Obora, Yasushi,Shimizu, Ken-ichi,Suzuki, Takeyuki,Tanaka, Tatsuya,Toyao, Takashi
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- METHOD FOR EXTENDING LONG-TERM ELECTRICAL POWER CABLE PERFORMANCE
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An improved method for imparting excellent long-term dielectric performance to an in-service electrical cable section having a stranded conductor surrounded by a conductor shield encased in a polymeric insulation and having an interstitial void volume in the region of the conductor, the cable section having an average operating temperature T. The method comprising injecting a dielectric enhancement fluid composition into the interstitial void volume, the composition comprising at least one component selected from: (1) a water-reactive material selected from an organosilane monomer, the above organosilane monomer wherein at least one of the water-reactive groups has been substituted with a condensable silanol group, an oligomer of the above organosilane monomer, or a co-oligomer of the above organosilane monomer, the organosilane monomer having a diffusion coefficient at least about 15 times greater than the diffusion coefficient of its corresponding tetramer;(2) a water-reactive material similar to (1) having at least one group attached to silicon comprising 7 to about 20 —CH2— units;(3) a non-water-reactive organic material which has a diffusion coefficient of less than about 10?9 cm2/sec and an equilibrium concentration of at least about 0.005 gm/cm3 in the polymeric insulation, the above mentioned diffusion coefficients and equilibrium concentration being determined at temperature T; or(4) an organic compound having an equilibrium concentration in the polymeric insulation at 55° C. which is less than 2.25 times the equilibrium concentration at 22° C.
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