Al/α-PbO2/β-PbO2 composite electrodes doped with rare earth oxide （CeO2） were prepared by anodic oxidation method investigate the influence of nano-CeO2 dopants on the properties of Al/α-PbO2/β-PbO2-CeO2 electro...Al/α-PbO2/β-PbO2 composite electrodes doped with rare earth oxide （CeO2） were prepared by anodic oxidation method investigate the influence of nano-CeO2 dopants on the properties of Al/α-PbO2/β-PbO2-CeO2 electrodes and the impact of α-PbO2 as the intermediate layer. The results show that using α-PbO2 as the intermediate layer will benefit the crystallization of β-PbO2 and β-PbO2 is more suitable as the surface layer than α-PbO2. CeO2 dopants change the crystallite size and crystal structure, enhance the catalytic activity, and even change the deposition mechanism of PbO2. The doping of CeO2 in the PbO2 electrodes can enhance the electro-catalytic activity, which is helpful for oxygen evolution, and therefore reduce the cell voltage.展开更多
CeO2 nanoparticles with an average diameter of about 30 nm were prepared by sol-gel method at lower temperature. The gel, transformed from the aqueous solution of metal nitrate and citric acid, can be combusted comple...CeO2 nanoparticles with an average diameter of about 30 nm were prepared by sol-gel method at lower temperature. The gel, transformed from the aqueous solution of metal nitrate and citric acid, can be combusted completely at lower temperature. The redox behavior and the crystallization process of the dried gel were studied by thermogravimetric analysis and infrared spectroscopy. The synthesized powders were characterized by X-ray powder diffraction and transmission electron microscopy. In addition, rare earth elements ion-selective electrodes based on acetyl cellulose were prepared using ultra fine cerium oxide powders.展开更多
通过沉积沉淀法制备了Au负载量为3%的Au/CeO2催化剂,并利用表征手段结合固定床反应器试验研究了催化剂的理化特性和催化水煤气变换反应(water gas shift reaction,WGSR)的活性.结果表明:Au元素均匀地分散在了载体表面,改善了催化剂的氧...通过沉积沉淀法制备了Au负载量为3%的Au/CeO2催化剂,并利用表征手段结合固定床反应器试验研究了催化剂的理化特性和催化水煤气变换反应(water gas shift reaction,WGSR)的活性.结果表明:Au元素均匀地分散在了载体表面,改善了催化剂的氧化还原性能和CO吸附性能,进而提高了催化剂的活性,当反应温度为300℃时,WGSR试验中CO转化率提高了56.0%,O2促进了催化剂表面碳酸盐类物质的分解,恢复了催化剂的表面活性位,明显提高了低温下CO的转化率;当反应温度在200,250℃时,CO转化率分别提高了15.0%和17.5%.展开更多
基金Project(50964008)supported by the National Natural Science Foundation of ChinaProject(2010287)supported by Analysis and Testing Foundation of Kunming University of Science and Technology,China
文摘Al/α-PbO2/β-PbO2 composite electrodes doped with rare earth oxide （CeO2） were prepared by anodic oxidation method investigate the influence of nano-CeO2 dopants on the properties of Al/α-PbO2/β-PbO2-CeO2 electrodes and the impact of α-PbO2 as the intermediate layer. The results show that using α-PbO2 as the intermediate layer will benefit the crystallization of β-PbO2 and β-PbO2 is more suitable as the surface layer than α-PbO2. CeO2 dopants change the crystallite size and crystal structure, enhance the catalytic activity, and even change the deposition mechanism of PbO2. The doping of CeO2 in the PbO2 electrodes can enhance the electro-catalytic activity, which is helpful for oxygen evolution, and therefore reduce the cell voltage.
基金The work was financially supported by the Project KJCXGC-O1 of Northwest Normal University, Lanzhou and theExcellent Young Te
文摘CeO2 nanoparticles with an average diameter of about 30 nm were prepared by sol-gel method at lower temperature. The gel, transformed from the aqueous solution of metal nitrate and citric acid, can be combusted completely at lower temperature. The redox behavior and the crystallization process of the dried gel were studied by thermogravimetric analysis and infrared spectroscopy. The synthesized powders were characterized by X-ray powder diffraction and transmission electron microscopy. In addition, rare earth elements ion-selective electrodes based on acetyl cellulose were prepared using ultra fine cerium oxide powders.
文摘通过沉积沉淀法制备了Au负载量为3%的Au/CeO2催化剂,并利用表征手段结合固定床反应器试验研究了催化剂的理化特性和催化水煤气变换反应(water gas shift reaction,WGSR)的活性.结果表明:Au元素均匀地分散在了载体表面,改善了催化剂的氧化还原性能和CO吸附性能,进而提高了催化剂的活性,当反应温度为300℃时,WGSR试验中CO转化率提高了56.0%,O2促进了催化剂表面碳酸盐类物质的分解,恢复了催化剂的表面活性位,明显提高了低温下CO的转化率;当反应温度在200,250℃时,CO转化率分别提高了15.0%和17.5%.
