A formula was proposed to calculate the distribution of metal ions quantitatively in chemical reaction system forming hydroxide where precipitation and complex are formed together. The effects of some factors on forma...A formula was proposed to calculate the distribution of metal ions quantitatively in chemical reaction system forming hydroxide where precipitation and complex are formed together. The effects of some factors on formation of precipitation and complex were investigated, and the corresponding precipitation rates of zinc, iron （III）, aluminum, copper and magnesium were calculated. As a result, it shows that the proposed formula is reliable. By the proposed formula, the existence state of metal ions in hydroxides reaction system with any metal ions can be well described and the effects of some factors on the distribution of metal ions were determined.展开更多
Aim To establish a capillary electrophoresis method for enantiomericseparation of meptazinol hydrochlo-ride. Methods The separation conditions such ascyclodextrin(CD)type, buffer pH, concentration of 2,3,6-O-trimethyl...Aim To establish a capillary electrophoresis method for enantiomericseparation of meptazinol hydrochlo-ride. Methods The separation conditions such ascyclodextrin(CD)type, buffer pH, concentration of 2,3,6-O-trimethyl-β-cyclodextrin and organicadditives were optimized. An optimum concentration was 30 mmol· L^(-1) phosphate (pH 7.02) with 10%(W/V) TM-β-CD and 2% acetonitrile. Results Baseline resolution of the enantiomer was readilyachieved using 2, 3, 6-O-trimethyl-β-cyclodextrin. Conclusion This is a convenient method for fastenantiomeric resolution of meptazinol hydrochloride.展开更多
A new mechanism of catalyst has been demonstrated in this article. With the interaction between carbon nitride(CN) and encapsulated nickel, the CN in the catalyst has been endowed with new active sites for the adsorpt...A new mechanism of catalyst has been demonstrated in this article. With the interaction between carbon nitride(CN) and encapsulated nickel, the CN in the catalyst has been endowed with new active sites for the adsorption and activation of hydrogen while nickel itself is physically isolated from the contact with reactive molecules. For the selective hydrogenation of acetylene in large amount of ethylene, the catalyst shows excellent ethylene selectivity than the nickel catalyst itself, which is almost totally unselective. Meanwhile, the CN itself is inactive for the reaction. The results of characterization demonstrate that pyridinic nitrogen doped in the carbon matrix should be the active sites for hydrogen dissociative adsorption. The theoretical calculations further confirm the results and provide with the detail in the electron transfer between nickel and CN in the catalyst. The current results supply a new concept for design of high performance catalyst.展开更多
基金Project (51304047) supported by the National Natural Science Foundation of ChinaProject (20131037) supported by Science and Technology Foundation of Liaoning Province,China
文摘A formula was proposed to calculate the distribution of metal ions quantitatively in chemical reaction system forming hydroxide where precipitation and complex are formed together. The effects of some factors on formation of precipitation and complex were investigated, and the corresponding precipitation rates of zinc, iron （III）, aluminum, copper and magnesium were calculated. As a result, it shows that the proposed formula is reliable. By the proposed formula, the existence state of metal ions in hydroxides reaction system with any metal ions can be well described and the effects of some factors on the distribution of metal ions were determined.
文摘Aim To establish a capillary electrophoresis method for enantiomericseparation of meptazinol hydrochlo-ride. Methods The separation conditions such ascyclodextrin(CD)type, buffer pH, concentration of 2,3,6-O-trimethyl-β-cyclodextrin and organicadditives were optimized. An optimum concentration was 30 mmol· L^(-1) phosphate (pH 7.02) with 10%(W/V) TM-β-CD and 2% acetonitrile. Results Baseline resolution of the enantiomer was readilyachieved using 2, 3, 6-O-trimethyl-β-cyclodextrin. Conclusion This is a convenient method for fastenantiomeric resolution of meptazinol hydrochloride.
文摘A new mechanism of catalyst has been demonstrated in this article. With the interaction between carbon nitride(CN) and encapsulated nickel, the CN in the catalyst has been endowed with new active sites for the adsorption and activation of hydrogen while nickel itself is physically isolated from the contact with reactive molecules. For the selective hydrogenation of acetylene in large amount of ethylene, the catalyst shows excellent ethylene selectivity than the nickel catalyst itself, which is almost totally unselective. Meanwhile, the CN itself is inactive for the reaction. The results of characterization demonstrate that pyridinic nitrogen doped in the carbon matrix should be the active sites for hydrogen dissociative adsorption. The theoretical calculations further confirm the results and provide with the detail in the electron transfer between nickel and CN in the catalyst. The current results supply a new concept for design of high performance catalyst.
