ZrO2-based mixed metal oxide catalysts for the industrially important dehydrogenation process of ethylbenzene to styrene monomer have been explored by our group for the past 20 years.These efforts were subjected to th...ZrO2-based mixed metal oxide catalysts for the industrially important dehydrogenation process of ethylbenzene to styrene monomer have been explored by our group for the past 20 years.These efforts were subjected to the activation of CO2 over mixed metal oxide catalysts and resulted in several promising benefits to the dehydrogenation processes,such as stabilized conversion and selectivity,suppressed coke formation and commercially-acceptable longevity.In this review,we summarize the most recent developments on ZrO2-based mixed metal oxide catalysts,including the further optimization of sol-gel process in the synthesis of catalysts,rationalizing acid-base properties by doping,co-operative properties between redox and acid-base active sites and additional promoters towards the effective improvement of the longevity of catalysts.展开更多
We demonstrate the generation of dark and bright solitons with our homemade zirconia-based erbium-doped fiber and graphene oxide（GO） saturable absorber in anomalous dispersion region.The GO is fabricated using an ab...We demonstrate the generation of dark and bright solitons with our homemade zirconia-based erbium-doped fiber and graphene oxide（GO） saturable absorber in anomalous dispersion region.The GO is fabricated using an abridged Hummer＇s method,which is combined with polyethylene oxide to produce a composite film.The film is sandwiched between two optical ferrules and embedded in the laser cavity to enhance its birefringence and nonlinearity.The self-starting bright soliton is easily generated at pump power of 78 mW with the whole length cavity of 14.7 m.The laser produces the bright pulse train with repetition rate,pulse width,pulse energy and central wavelength being 13.9 MHz,0.6 ps,2.74 p J and 1577.46 nm,respectively.Then,by adding the 10 m of single mode fiber into the laser cavity,dark soliton pulse is produced.For the formation of dark pulse train,the measured repetition rate,pulse width,pulse energy and central wavelength are 8.3 MHz,20 ns and 4.98 p J and1596.82 nm,respectively.Both pulses operate in the anomalous region.展开更多
The surface properties of zirconia-based supports,ZrO-2/SiO-2 and ZrO-2,were compared.ZrO-2/SiO-2 prepared by layer-by-layer self-assembly(LbL SA) technique showed more favorable characteristics for HPLC applications ...The surface properties of zirconia-based supports,ZrO-2/SiO-2 and ZrO-2,were compared.ZrO-2/SiO-2 prepared by layer-by-layer self-assembly(LbL SA) technique showed more favorable characteristics for HPLC applications compared with ZrO-2 prepared by modified oil-emulsion method.The specific surface area and pore volume of ZrO-2/SiO-2 were about 18 and 20 times of those of ZrO-2 respectively.The pore of ZrO-2/SiO-2 support was ideal cylindrical shape,but ZrO-2 support had some \!ink bottle\" shaped-pores which was unfavorable for HPLC separations.Pore size distribution of ZrO-2/SiO-2 supports was more uniform than that of ZrO-2 supports.展开更多
基金funded by Saudi Arabia Basic Industries Corporation(Kingdom of Saudi Arabia),the BK21 Plus Project in 2014
文摘ZrO2-based mixed metal oxide catalysts for the industrially important dehydrogenation process of ethylbenzene to styrene monomer have been explored by our group for the past 20 years.These efforts were subjected to the activation of CO2 over mixed metal oxide catalysts and resulted in several promising benefits to the dehydrogenation processes,such as stabilized conversion and selectivity,suppressed coke formation and commercially-acceptable longevity.In this review,we summarize the most recent developments on ZrO2-based mixed metal oxide catalysts,including the further optimization of sol-gel process in the synthesis of catalysts,rationalizing acid-base properties by doping,co-operative properties between redox and acid-base active sites and additional promoters towards the effective improvement of the longevity of catalysts.
文摘We demonstrate the generation of dark and bright solitons with our homemade zirconia-based erbium-doped fiber and graphene oxide（GO） saturable absorber in anomalous dispersion region.The GO is fabricated using an abridged Hummer＇s method,which is combined with polyethylene oxide to produce a composite film.The film is sandwiched between two optical ferrules and embedded in the laser cavity to enhance its birefringence and nonlinearity.The self-starting bright soliton is easily generated at pump power of 78 mW with the whole length cavity of 14.7 m.The laser produces the bright pulse train with repetition rate,pulse width,pulse energy and central wavelength being 13.9 MHz,0.6 ps,2.74 p J and 1577.46 nm,respectively.Then,by adding the 10 m of single mode fiber into the laser cavity,dark soliton pulse is produced.For the formation of dark pulse train,the measured repetition rate,pulse width,pulse energy and central wavelength are 8.3 MHz,20 ns and 4.98 p J and1596.82 nm,respectively.Both pulses operate in the anomalous region.
文摘The surface properties of zirconia-based supports,ZrO-2/SiO-2 and ZrO-2,were compared.ZrO-2/SiO-2 prepared by layer-by-layer self-assembly(LbL SA) technique showed more favorable characteristics for HPLC applications compared with ZrO-2 prepared by modified oil-emulsion method.The specific surface area and pore volume of ZrO-2/SiO-2 were about 18 and 20 times of those of ZrO-2 respectively.The pore of ZrO-2/SiO-2 support was ideal cylindrical shape,but ZrO-2 support had some \!ink bottle\" shaped-pores which was unfavorable for HPLC separations.Pore size distribution of ZrO-2/SiO-2 supports was more uniform than that of ZrO-2 supports.
基金supported by the National High Technology Research and Development Program of China (863 Program, 2011AA050704)the National Basic Research Program of China (973 Program, 2010CB732302, 2012CB215500)the National Natural Science Foundation of China (21376238, 21306189, and 51101146)~~
