Tungstocobaltphosphate and tungstonickelphosphate were synthesized,and their film modified glassy carbon electrodes were prepared by electrochemical deposition.The films are very stable and research was made in their ...Tungstocobaltphosphate and tungstonickelphosphate were synthesized,and their film modified glassy carbon electrodes were prepared by electrochemical deposition.The films are very stable and research was made in their electrochemical properties in 0.5mol/L H 2SO 4.The effects of electrolyte,solvent,pH and other variables on the voltammetric behaviour of the film modiffed electrodes have been studied.展开更多
Wells-dawson type heteropolyacid catalyst was prepared by acidification-etherization and characterized by FTIR,over which cyclohexanone ethylene ketal was synthesized from cyclohexanone to ethylene.The experiment resu...Wells-dawson type heteropolyacid catalyst was prepared by acidification-etherization and characterized by FTIR,over which cyclohexanone ethylene ketal was synthesized from cyclohexanone to ethylene.The experiment results showed that the optimal reaction conditions are as follows:the amount of Cyclohexanone is 0.1mol,the molar ratio of Cyclohexanone to ethylene was1.0/1.5(mol/mol),catalyst amount 1.50%(pencent of the reaction stock materials).Through reaction time 2.5h,the yield of cyclohexanone ethylene katal reached over 95.0%.展开更多
合成了未见报道的标题配合物。通过化学分析、ICP和TG曲线确定了其化学式为K_8H_3[Y(PW_(11)O_(39))_2]·25H_2O;利用IR、UV、XRD、^(183)W-NMR、循环伏安等手段对其结构进行了表征,结果表明杂多阴离子为β_2型Keggin结构。采用稀...合成了未见报道的标题配合物。通过化学分析、ICP和TG曲线确定了其化学式为K_8H_3[Y(PW_(11)O_(39))_2]·25H_2O;利用IR、UV、XRD、^(183)W-NMR、循环伏安等手段对其结构进行了表征,结果表明杂多阴离子为β_2型Keggin结构。采用稀土多元渗的方法对配合物进行了气相热扩渗,经ICP和XPS测试表明:微量的稀土元素La和Ce可以渗入到配合物的体相,并与组份元素存在键合作用。扩渗后化合物的化学式为K_8H_6YLa_(0.11)Ce_(0.18)P_2W_4~ⅤW_(18)~ⅥO_(78)·15H_2O,其晶体属单斜晶系,晶胞参数:a=6.3775nm,b=3.6771nm,c=3.7727nm,β=90.192°,V=88.47326nm^3;导电性的测试结果表明:室温时,扩渗后试样的电导率提高了约10~3倍,且热稳定范围变宽,523K时的电导率为1.33×10^(-2)S·cm^(-1),有望成为实用化的导电材料;~1H MAS NMR测试结果表明其存在三种质子,其导电机理可能是质子导电。展开更多
Active carbon supported H 3PW 12 O 40 (PW 12 )solid acid catalysts are prepared and used in the etherification of light FCC gasoline with methanol.The effects of preparation conditions and the PW 12 loading on the act...Active carbon supported H 3PW 12 O 40 (PW 12 )solid acid catalysts are prepared and used in the etherification of light FCC gasoline with methanol.The effects of preparation conditions and the PW 12 loading on the activities of PW 12 (40)/C catalysts are studied.The results showed that the reflux time and the activating temperature influence the activity of the catalyst.As the loading of PW 12 on active carbon is lower, the reaction of PW 12 with the hydroxyl on the surface of active carbon makes the activity of the catalyst decrease.With the increase of loading of PW 12 on active carbon, the activities of the catalysts increase.Using PW 12 (40)/C as catalyst,under the conditions of reaction temperature 75?℃,pressure 0.8?MPa,molar ratio of methanol with tertiary carbonic olefins 1.0,and hourly space velocity 1.0 h -1 ,the ethers content in etherified light gasoline is up to 13.86%.展开更多
文摘Tungstocobaltphosphate and tungstonickelphosphate were synthesized,and their film modified glassy carbon electrodes were prepared by electrochemical deposition.The films are very stable and research was made in their electrochemical properties in 0.5mol/L H 2SO 4.The effects of electrolyte,solvent,pH and other variables on the voltammetric behaviour of the film modiffed electrodes have been studied.
文摘Wells-dawson type heteropolyacid catalyst was prepared by acidification-etherization and characterized by FTIR,over which cyclohexanone ethylene ketal was synthesized from cyclohexanone to ethylene.The experiment results showed that the optimal reaction conditions are as follows:the amount of Cyclohexanone is 0.1mol,the molar ratio of Cyclohexanone to ethylene was1.0/1.5(mol/mol),catalyst amount 1.50%(pencent of the reaction stock materials).Through reaction time 2.5h,the yield of cyclohexanone ethylene katal reached over 95.0%.
文摘合成了未见报道的标题配合物。通过化学分析、ICP和TG曲线确定了其化学式为K_8H_3[Y(PW_(11)O_(39))_2]·25H_2O;利用IR、UV、XRD、^(183)W-NMR、循环伏安等手段对其结构进行了表征,结果表明杂多阴离子为β_2型Keggin结构。采用稀土多元渗的方法对配合物进行了气相热扩渗,经ICP和XPS测试表明:微量的稀土元素La和Ce可以渗入到配合物的体相,并与组份元素存在键合作用。扩渗后化合物的化学式为K_8H_6YLa_(0.11)Ce_(0.18)P_2W_4~ⅤW_(18)~ⅥO_(78)·15H_2O,其晶体属单斜晶系,晶胞参数:a=6.3775nm,b=3.6771nm,c=3.7727nm,β=90.192°,V=88.47326nm^3;导电性的测试结果表明:室温时,扩渗后试样的电导率提高了约10~3倍,且热稳定范围变宽,523K时的电导率为1.33×10^(-2)S·cm^(-1),有望成为实用化的导电材料;~1H MAS NMR测试结果表明其存在三种质子,其导电机理可能是质子导电。
文摘Active carbon supported H 3PW 12 O 40 (PW 12 )solid acid catalysts are prepared and used in the etherification of light FCC gasoline with methanol.The effects of preparation conditions and the PW 12 loading on the activities of PW 12 (40)/C catalysts are studied.The results showed that the reflux time and the activating temperature influence the activity of the catalyst.As the loading of PW 12 on active carbon is lower, the reaction of PW 12 with the hydroxyl on the surface of active carbon makes the activity of the catalyst decrease.With the increase of loading of PW 12 on active carbon, the activities of the catalysts increase.Using PW 12 (40)/C as catalyst,under the conditions of reaction temperature 75?℃,pressure 0.8?MPa,molar ratio of methanol with tertiary carbonic olefins 1.0,and hourly space velocity 1.0 h -1 ,the ethers content in etherified light gasoline is up to 13.86%.
