Ni（HCO3）2 with unique phase and high crystallinity was synthesized with urea hydrolysis. The as-prepared samples were well characterized in detail. N2 adsorption and desorption result manifests a high surface area o...Ni（HCO3）2 with unique phase and high crystallinity was synthesized with urea hydrolysis. The as-prepared samples were well characterized in detail. N2 adsorption and desorption result manifests a high surface area of 99.03 m2/g with a pore size of 7.8 nm. Scanning electron microscopy （SEM） and particle size distribution reveal that the diameters of the formed pellets are uniform. Thermogravimetry （TG） analysis result shows that 500 ℃ could be the appropriate temperature for converting Ni（HCO3）2 precursors into NiO via a thermal decomposition process. CO2 and NH3 temperature-programmed desorption results show that Ni（HCO3）2 has explicit acid-base sites. Transmission electron microscopy （TEM） results vividly indicate that the pellets are aggregated by hexagonal platelets and possess porous structures. Ni（HCO3）2 can efficiently catalyze the one-step synthesis of benzoin ethyl ether from benzaldehyde and ethanol, with the conversion ofbenzaldehyde up to 57.5% and nearly 100% selectivity of benzoin ethyl ether.展开更多
In this work,mixtures of HCHO-NO2-Ar were photolyzed under stationary conditions using a high-pressure Hg lamp atλ =300～ 340 nm and HCHO as a probe molecule.The HCO radicals were generated in the reaction system,and...In this work,mixtures of HCHO-NO2-Ar were photolyzed under stationary conditions using a high-pressure Hg lamp atλ =300～ 340 nm and HCHO as a probe molecule.The HCO radicals were generated in the reaction system,and the kinetics of the reaction between HCO radicals and NO2 was investigated at room temperature in Ar gas at 5.7× 104 Pa pressure by FTIR spectroscopy.The main reaction products including CO,CO2,NO,HONO and H2O were detected.A small amount of N2O was found only at longer reaction times when NO2 consumption was complete.These product molecules were formed in consecutive reactions from several reaction channels.From the yields of CO and CO2,branching ratios were determined and their kinetic mec hanism was discussed.展开更多
基金Project(50872086)supported by the National Natural Science Foundation of ChinaProject(2012021006-3)supported by the Natural Science Foundation of Shanxi Province,China+1 种基金Project(2012L022)supported by Special/Youth Foundation of Taiyuan University of Technology,ChinaProject(20120321033-02)supported by Science and Technology Research of Shanxi Province,China
文摘Ni（HCO3）2 with unique phase and high crystallinity was synthesized with urea hydrolysis. The as-prepared samples were well characterized in detail. N2 adsorption and desorption result manifests a high surface area of 99.03 m2/g with a pore size of 7.8 nm. Scanning electron microscopy （SEM） and particle size distribution reveal that the diameters of the formed pellets are uniform. Thermogravimetry （TG） analysis result shows that 500 ℃ could be the appropriate temperature for converting Ni（HCO3）2 precursors into NiO via a thermal decomposition process. CO2 and NH3 temperature-programmed desorption results show that Ni（HCO3）2 has explicit acid-base sites. Transmission electron microscopy （TEM） results vividly indicate that the pellets are aggregated by hexagonal platelets and possess porous structures. Ni（HCO3）2 can efficiently catalyze the one-step synthesis of benzoin ethyl ether from benzaldehyde and ethanol, with the conversion ofbenzaldehyde up to 57.5% and nearly 100% selectivity of benzoin ethyl ether.
文摘In this work,mixtures of HCHO-NO2-Ar were photolyzed under stationary conditions using a high-pressure Hg lamp atλ =300～ 340 nm and HCHO as a probe molecule.The HCO radicals were generated in the reaction system,and the kinetics of the reaction between HCO radicals and NO2 was investigated at room temperature in Ar gas at 5.7× 104 Pa pressure by FTIR spectroscopy.The main reaction products including CO,CO2,NO,HONO and H2O were detected.A small amount of N2O was found only at longer reaction times when NO2 consumption was complete.These product molecules were formed in consecutive reactions from several reaction channels.From the yields of CO and CO2,branching ratios were determined and their kinetic mec hanism was discussed.
