Catalytic combustion of volatile organic compounds (VOCs) such as ethylene, toluene, and acetaldehyde over novel Pt/CeO2–ZrO2–SnO2/γ-Al2O3 catalysts prepared by a coprecipitation method was investigated. The introduction of a small amount of SnO2 within the CeO2–ZrO2 lattice as a promoter was considerably effective to enhance the oxygen release and storage abilities of the catalysts, so that complete oxidation of VOCs was markedly activated. This improvement of the reducibility of the catalyst can be ascribed to the simultaneous reduction of Ce4+ and Sn4+ in the CeO2–ZrO2–SnO2 solid solutions. By the optimization of the composition and the Pt amount, complete oxidation of ethylene, toluene, and acetaldehyde was realized at temperatures as low as 55, 110, and 140 °C over a Pt(10 wt %)/Ce0.68Zr0.17Sn0.15O2.0(16 wt %)/γ-Al2O3 catalyst, respectively.
The utilization of polymeric amines for the hydrogenation of CO 2 to methanol via formamides was explored with a focus on a catalytic promoter, as well as a beneficial reaction medium with enhanced basicity. Branched and linear poly(ethyleneimine)s (PEIs) were efficiently formylated in the presence of a series of PN H P-pincer Ru complexes under CO 2 hydrogenation conditions at 100°C in THF. The obtained Nformylated PEI was characterized by NMR spectroscopy. The formamide units on the polymer were reduced at a higher temperature under pressurized H 2 to afford methanol and to recover [a]
We have designed a new pendant-type polymer having an electronegative terthiophene at pendant positions. This polymer was successfully synthesized by the combination of Stille coupling reaction and palladium-catalyzed cyclopolymerization. To investigate the properties of the polymer, electronic absorption and fluorescence spectra as well as cyclic voltammogram were measured.Development of ³-conjugated systems can be realized by versatile protocols of transition-metal-catalyzed cross-coupling reactions.
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