One‐step production of pyruvic acid through selective oxidation of glycerol was investigated using lead promoted platinum/activated carbon(Pb‐Pt/AC)catalysts under mild conditions.The results of N2physisorption,X‐r...One‐step production of pyruvic acid through selective oxidation of glycerol was investigated using lead promoted platinum/activated carbon(Pb‐Pt/AC)catalysts under mild conditions.The results of N2physisorption,X‐ray diffraction,X‐ray photoelectron spectroscopy,and high‐resolution transmission electron microscopy revealed that the alloy phases of PtPb and PtxPb were favorable for pyruvic acid production from glycerol oxidation,whereas the Pb3(CO3)2(OH)2and surface Pb0species inhibited the glycerol conversion.The loading of Pb and the catalyst preparation method(including impregnation and deposition precipitation)affected the formation of different metal species.Pyruvic acid was obtained at a yield of18.4%on a5.0wt%Pb‐5.0wt%Pt/AC catalyst prepared by co‐deposition precipitation method and500°C argon treatment.展开更多
The paraffin wax microemulsion was prepared from fully refined paraffin wax No.58-60 in the presence of a nonionic surfactant and an anionic surfactant.The influence of manufacturing parameters on the particle diamete...The paraffin wax microemulsion was prepared from fully refined paraffin wax No.58-60 in the presence of a nonionic surfactant and an anionic surfactant.The influence of manufacturing parameters on the particle diameter of paraffin wax microemulsion included the quantity of the emulsifier,the temperature and emulsification time,the stirring speed,the pH value and the auxiliary ingredient(cosurfactant).The test results showed that the temperature of emulsification had little effect on the particle size of paraffin wax microemulsion in a temperature range of 75-85 ℃.Other manufacturing parameters all had a great effect on the particle size of paraffin wax microemulsion.The optimum preparation conditions included:a w(emulsifier) of 6%,an emulsification temperature of 80 ℃,an emulsification time of 40 min,a pH value of about 8,and a stirring speed of 600 r/min,with n-amyl alcohol serving as the co-surfactant.Under these conditions,a translucent and baby blue paraffin wax emulsion was prepared with its particle size equating to 97 nm.展开更多
基金supported by the National Natural Science Foundation of China(21176236)~~
文摘One‐step production of pyruvic acid through selective oxidation of glycerol was investigated using lead promoted platinum/activated carbon(Pb‐Pt/AC)catalysts under mild conditions.The results of N2physisorption,X‐ray diffraction,X‐ray photoelectron spectroscopy,and high‐resolution transmission electron microscopy revealed that the alloy phases of PtPb and PtxPb were favorable for pyruvic acid production from glycerol oxidation,whereas the Pb3(CO3)2(OH)2and surface Pb0species inhibited the glycerol conversion.The loading of Pb and the catalyst preparation method(including impregnation and deposition precipitation)affected the formation of different metal species.Pyruvic acid was obtained at a yield of18.4%on a5.0wt%Pb‐5.0wt%Pt/AC catalyst prepared by co‐deposition precipitation method and500°C argon treatment.
基金supported by The National Natural Science Funds (Project No. 21076025)
文摘The paraffin wax microemulsion was prepared from fully refined paraffin wax No.58-60 in the presence of a nonionic surfactant and an anionic surfactant.The influence of manufacturing parameters on the particle diameter of paraffin wax microemulsion included the quantity of the emulsifier,the temperature and emulsification time,the stirring speed,the pH value and the auxiliary ingredient(cosurfactant).The test results showed that the temperature of emulsification had little effect on the particle size of paraffin wax microemulsion in a temperature range of 75-85 ℃.Other manufacturing parameters all had a great effect on the particle size of paraffin wax microemulsion.The optimum preparation conditions included:a w(emulsifier) of 6%,an emulsification temperature of 80 ℃,an emulsification time of 40 min,a pH value of about 8,and a stirring speed of 600 r/min,with n-amyl alcohol serving as the co-surfactant.Under these conditions,a translucent and baby blue paraffin wax emulsion was prepared with its particle size equating to 97 nm.
