论文部分内容阅读
采用分步酸化-分步加料及离子交换-冷冻法合成出含镓、锆和钨的取代型杂多酸H5[Ga(H2O)ZrW11O39].14H2O。给出了合成反应的原料配比及pH值。通过元素分析(ICP)、红外光谱、紫外光谱和X-射线粉末衍射等手段对其进行了表征。在此基础上,研究了它的导电和催化酯化反应性能。在室温(16℃)下,取代型杂多酸H5[Ga(H2O)ZrW11O39].14H2O的质子电导率为8.76×10-4S.cm-1,是一新型固体高质子导体。通过测定不同温度下的电导率,得到H5[Ga(H2O)ZrW11O39].14H2O的活化能是21.20kJ/mol。该取代型杂多酸催化剂催化酯化反应效果好且可多次重复使用。
The substituted heteropolyacid H5 [Ga (H2O) ZrW11O39] containing 14.4% of gallium, zirconium and tungsten was synthesized by stepwise acidification-step addition and ion exchange-freezing method. The synthesis ratio of raw materials and pH value are given. It was characterized by elemental analysis (ICP), infrared spectroscopy, UV spectroscopy and X-ray powder diffraction. Based on this, its conductivity and catalytic esterification performance were studied. The substituted heteropolyacid H5 [Ga (H2O) ZrW11O39] has a proton conductivity of 8.76 × 10-4S · cm-1 at room temperature (16 ℃), and is a new solid high proton conductor. H5 [Ga (H2O) ZrW11O39] was obtained by measuring the conductivity at different temperatures. The activation energy of 14H2O was 21.20 kJ / mol. The substituted heteropolyacid catalyst has good esterification reaction effect and can be reused repeatedly.