Preparation of metal oxide particle via organic polymeric materials

我们一直在继续研究开发一种由各种原料制备多孔炭材料的新方法及其应用。特别是，我们试图通过提高产率、比表面积和控制产品碳材料的孔结构来改善多孔炭材料的性能。我们从废弃物再利用的角度对椰壳、竹子、木屑和交换树脂作为碳源进行了研究。目前，在多孔炭基质中合成高分散超细金属化合物粒子的尝试已经发展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？我们发现聚合物原料中吸附的金属离子在…中高度分散。碳热还原后，更多的碳基质成为纳米级金属化合物的超细颗粒。此外，根据温度和气体气氛等处理条件，还可以获得还原金属、金属氧化物、硫化物、氮化物、磷化物等金属物种。确定了微孔(小于2 nm)到中孔(约4 nm)控制炭基质孔径的条件。所得到的碳-金属化合物不能用传统的金属负载碳催化剂实现。目前的碳热还原方法也是获得纳米颗粒新材料的一种有用的方法。目前几代汽车尾气处理三效催化剂依赖于氧化铈作为动态氧源。CeO2储存、运输和释放氧气的能力在一系列清洁能源技术中具有重要意义。在本研究中，我们以锯末为原料，在介孔碳基质中合成了高度均匀分散的CeO_2、ZrO_2和CeO_2-ZrO_2。最后，在两种氧化条件下进行碳化和焙烧：低焙烧温度温和氧化气氛下的碳化焙烧和高温焙烧重度氧化气氛下的碳化焙烧。粉末X-射线衍射仪研究表明，Ce、Zr和Ce-Zr在碳基复合材料中是无定形的，焙烧后出现了其氧化物的特征峰。粒度分布表明，在温和的氧化条件下，100μm焙烧得到的颗粒的粒度分布比700μm焙烧的10℃m要窄。具有代表性的样品的HRTEM分析表明，CeO2、ZrO2和Ce&lt；0.5&gt；Zr_&lt；0.5&gt；O2的颗粒尺寸在5-10 nm之间。EDS分析证实其为立方相。其他应用如开发基于铜和/或RuO&lt；22&gt；碳复合材料的高能量密度双电层电容器(EDLC)也在积极研究中。较少

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