Preparation of metal oxide particle via organic polymeric materials

我们一直在继续研究开发一种从各种原料制备多孔碳材料的新方法及其应用。特别地，我们已经尝试通过增加产率、表面积和控制产物碳材料的孔结构来改善多孔碳材料的性能。我们从废物利用的角度出发，研究了椰壳、竹子、锯末和树脂作为碳源，并将在多孔碳基体中制备高分散的超细金属复合颗粒作为反应工程研究的一部分。也就是说，当金属离子浸渍树脂在惰性气体中热分解时，离子交换树脂中的金属离子物种对碳化（碳热还原）有什么影响？我们发现，吸附在聚合物原料中的金属离子高度分散在聚合物基体中， ...更多信息 碳热还原后的碳基体为纳米级金属化合物的超微粒子。此外，取决于处理条件如温度和气体气氛，金属物质可以作为还原的金属、金属氧化物、硫化物、氮化物、磷化物等获得。阐明了控制碳基体孔径从中孔（小于2nm）到中孔（约4 nm）的条件。所获得的碳-金属化合物不能用常规的金属负载的碳催化剂实现。碳热还原法也是一种制备纳米材料的有效方法。目前用于汽车尾气处理的三效催化剂都是以铈锆为氧源的。CeO_2的储氧、输氧和释氧能力在清洁能源技术中具有重要的应用价值。本论文以木屑为原料，研究了在介孔炭基体中制备高度均匀分散的CeO_2、ZrO_2和CeO_2-ZrO_2的方法。最后，在两种氧化条件下进行碳复合材料的碳化和煅烧; LM：低煅烧温度和温和的氧化气氛，HS：高煅烧温度和严重的氧化气氛。粉末X射线衍射研究表明，Ce、Zr和Ce-Zr在碳复合材料中以及煅烧后均为非晶态，并观察到其氧化物的特征峰。粒度分布表明，温和的氧化条件使100 μm的颗粒比700℃煅烧的10 μm颗粒的粒度分布更窄。对样品的物理化学表征和高分辨透射电镜分析表明，样品中CeO_2、ZrO_2和Ce_<0.5>Zr_<0.5>O_2的粒径在5-10 nm之间。EDS分析证实它们为立方相，并在其它应用方面进行了积极的研究，如开发基于Cu和/或RuO_C复合材料的高能量密度双电层电容器（EDLC）<22>。少

We have been continuing research on the development of a novel method of preparation of porous carbon materials from various kinds of raw materials and their application. In particular, we have made attempts to improve the performance of porous carbon materials by increasing yield, surface area, and controlling the pore structure of the product carbon materials. We have been studying coconut shell, bamboo, sawdust and in-exchange resin as sources of carbon from the viewpoint of reutilization of waste materials.The present attempt to synthesize highly dispersed ultrafine metal compound particle in porous carbon matrix has been developed as a part of the reaction engineering research. That is to say, when metal ion impregnated resins are thermally decomposed in inert gases, what effect does the metal ion species in the ion-exchange resin have on the carbonization (carbothermal reduction)? We have found that the adsorbed metal ions in the raw polymeric materials are highly dispersed in th … More e carbon matrix as ultrafine particles of metal compounds of nanometer scale after carbothermal reduction. In addition the metal species could be obtained as reduced metal, metal oxide, sulfide, nitrides, phosphide etc, depending on the treatment conditions such as temperature and gaseous atmosphere. The conditions for controlling the pore size of the carbon matrix ranging from micropore (less than 2 nm) to mesopore (about 4 nm) have been elucidated. Carbon-metal compounds obtained can not be realised with the conventional metal supported carbon catalysts. The present carbothermal reduction method is also a useful method for obtaining new materials having nano size particles.The current generations of three-way catalysts for automotive exhaust gas treatment rely on ceria-zirconia as a dynamic oxygen source. The ability of CeO_2 to store, transport and release oxygen is of great importance in a range of clean energy technologies. In this study we investigate the synthesis of highly and homogeneously dispersed CeO_2, ZrO_2 and CeO_2-ZrO_2 in mesoporous carbon matrix from the sawdust. Finally carbonization and calcinations of the carbon composites were performed in two oxidizing conditions; LM : low calcination temperature and mild oxidation atmosphere and HS: high calcination temperature and severe oxidation atmosphere. Powder X-ray diffraction studies reveal that the Ce, Zr and Ce-Zr are amorphous in carbon composite and after the calcination ; the characteristic peaks of their oxides were observed. The particle size distributions showed that the mild oxidation conditions have provided the narrow size distribution of particles at 100 μm than 10 μm, which were calcined at 700℃. Physico-chemical characterization studies including HRTEM analysis of the representative samples show the presence of particle size of CeO_2, ZrO_2 and Ce_<0.5>Zr_<0.5>O_2 is in the range of 5-10 nm. EDS analysis confirmed that they are in cubic phase.Other applications such as development of high energy density electric double layer capacitor (EDLC) based on Cu and/or RuO_<22> carbon composite have been studied actively. Less