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钛酸四丁酯前驱体水热合成制备纳米TiO2颗粒,在TiO2和VulcanXC-72活性炭复合载体上液相还原负载Pd纳米颗粒,制得Pd/TiO2/C复合催化剂.通过透射电镜(TEM)和X射线衍射(XRD)测试表明其具有面心立方结构,Pd金属粒子(粒径约3~4 nm)均匀分散在锐钛矿型的纳米TiO2和活性碳的复合载体上.循环伏安和计时电流曲线测试表明,与相同Pd载量的Pd/C相比,20%(by mass,下同)Pd载量的Pd/TiO2/C颗粒在常温常压下对乙醇的电催化氧化有很高活性和稳定性.这主要归功于纳米TiO2改变了Pd表面的电子特性,且增大了其比表面积.
Titanium tetrabutyl titanate precursor was prepared by hydrothermal synthesis of nano-TiO2 particles, Pd / TiO2 / C composite catalyst was prepared by liquid-phase reduction of Pd nanoparticles on TiO2 and VulcanXC-72 activated carbon composite support. X-ray diffraction (XRD) measurements showed that the Pd particles have a face-centered cubic structure and the Pd metal particles (about 3 ~ 4 nm in diameter) are uniformly dispersed on the composite support of anatase nano-TiO2 and activated carbon. The current curve shows that the Pd / TiO2 / C particles with 20% by mass Pd loading have high electrocatalytic oxidation of ethanol under normal temperature and pressure compared with Pd / C with the same Pd content Activity and stability.This is mainly attributed to the fact that the nano-TiO2 changes the electronic properties of the Pd surface and increases its specific surface area.