The charge distribution on Ni-Mo-S active sites can affect hydrodenitrogenation(HDN)activity.In this study,a series of model Ni-Mo-S were developed with various charge distributions.For comparison,the charge distribut...The charge distribution on Ni-Mo-S active sites can affect hydrodenitrogenation(HDN)activity.In this study,a series of model Ni-Mo-S were developed with various charge distributions.For comparison,the charge distribution effects on quinoline HDN were studied.The results show that a lack of electrons and extra protons can both lower the orbital eigenvalue of the Ni-Mo-S,leading to stronger adsorption of nitrogen-containing compounds and inhibition of ammonia desorption.Electron deficiency will improve the generation of active hydrogen on the active sites but inhibit hydrogen transfer to the nitrogen compounds;extra protons can provide H^(+)to the nitrogen compounds,which will flexibly transfer between the nitrogen compound and active sites,thus improving the cleavage of the C-N bond.展开更多
Using the hydrothermal reactions of Mn（Ⅱ） and Ba（Ⅱ） salts with 2-（3-hydroxylphenyl）-1H-imidazole-4,5-dicarboxylic acid（m-OHPhH3IDC）,two novel metal-organic frameworks,namely,{[Mn（mOHPhHIDC）（H2O）]2H2On（1...Using the hydrothermal reactions of Mn（Ⅱ） and Ba（Ⅱ） salts with 2-（3-hydroxylphenyl）-1H-imidazole-4,5-dicarboxylic acid（m-OHPhH3IDC）,two novel metal-organic frameworks,namely,{[Mn（mOHPhHIDC）（H2O）]2H2On（1） and {[Ba（m-OHPhH2IDC）2（H2O）3]-2H2O）n,（2） have been synthesized and structurally characterized by single-crystal X-ray crystallography,elemental analyses,and IR spectroscopy.Complex 1 features a novel non-interpenetrated three-dimensional（3,4）-connected network with one-dimensional open channels.Complex 2 exhibits a two-dimensional layered structure with rhombic grids.The role of the central metals in the formation of final architectures has been discussed.Furthermore,luminescent and thermal properties of the two complexes have been studied.展开更多
In the hostile and highly corrosive marine environment,advanced composite materials can be used in marine current turbines due to their high strength-to-weight ratios and excellent resistance to corrosion.A composite ...In the hostile and highly corrosive marine environment,advanced composite materials can be used in marine current turbines due to their high strength-to-weight ratios and excellent resistance to corrosion.A composite material marine current turbine(CMMCT),which has significant advantages over traditional designs,has been developed and investigated numerically.A substantial improvement in turbine performance is achieved by placement of a duct to concentrate the energy.Computational fluid dynamics(CFD) results show that the extracted power of a ducted CMMCT can be three to four times the power extracted by a bare turbine of the same turbine area.The results provide an insight into the hydrodynamic design and operation of a CMMCT used to shorten the design period and improve technical performance.展开更多
基金the financial support from the Sinopec Science and Technology Department(Grant No.121014-1)。
文摘The charge distribution on Ni-Mo-S active sites can affect hydrodenitrogenation(HDN)activity.In this study,a series of model Ni-Mo-S were developed with various charge distributions.For comparison,the charge distribution effects on quinoline HDN were studied.The results show that a lack of electrons and extra protons can both lower the orbital eigenvalue of the Ni-Mo-S,leading to stronger adsorption of nitrogen-containing compounds and inhibition of ammonia desorption.Electron deficiency will improve the generation of active hydrogen on the active sites but inhibit hydrogen transfer to the nitrogen compounds;extra protons can provide H^(+)to the nitrogen compounds,which will flexibly transfer between the nitrogen compound and active sites,thus improving the cleavage of the C-N bond.
基金the financial support by the National Natural Science Foundation of China(No.21341002)the Natural Science Foundation of Henan Education Department(No.13A150655)
文摘Using the hydrothermal reactions of Mn（Ⅱ） and Ba（Ⅱ） salts with 2-（3-hydroxylphenyl）-1H-imidazole-4,5-dicarboxylic acid（m-OHPhH3IDC）,two novel metal-organic frameworks,namely,{[Mn（mOHPhHIDC）（H2O）]2H2On（1） and {[Ba（m-OHPhH2IDC）2（H2O）3]-2H2O）n,（2） have been synthesized and structurally characterized by single-crystal X-ray crystallography,elemental analyses,and IR spectroscopy.Complex 1 features a novel non-interpenetrated three-dimensional（3,4）-connected network with one-dimensional open channels.Complex 2 exhibits a two-dimensional layered structure with rhombic grids.The role of the central metals in the formation of final architectures has been discussed.Furthermore,luminescent and thermal properties of the two complexes have been studied.
文摘In the hostile and highly corrosive marine environment,advanced composite materials can be used in marine current turbines due to their high strength-to-weight ratios and excellent resistance to corrosion.A composite material marine current turbine(CMMCT),which has significant advantages over traditional designs,has been developed and investigated numerically.A substantial improvement in turbine performance is achieved by placement of a duct to concentrate the energy.Computational fluid dynamics(CFD) results show that the extracted power of a ducted CMMCT can be three to four times the power extracted by a bare turbine of the same turbine area.The results provide an insight into the hydrodynamic design and operation of a CMMCT used to shorten the design period and improve technical performance.
