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The development of nano capsule wrapped metal from wood biomass by flash pyrolysis

利用木材生物质快速热解开发纳米胶囊包裹金属

基本信息

批准号：
16580134
负责人：
IMAMURA Yuji
金额：
$ 1.98万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16580134/
关键词：
carbonized materials catalyst flash pyrolysis heating rate high heating treatment nano carbon structure wood cell wall nano capsule 急速熱分解不均一性木質バイオマス炭素材料微細構造結晶構造不均一構造

项目摘要

For the development of nano capsule wrapped metal from wood biomass by flash pyrolysis, two research projects were conducted with the aim of the high crystallization of wood-based carbonized materials. The research projects were "High crystallization of nano-carbon structure of wood-based carbonized materials by the application of flash pyrolysis and catalyst for graphitic carbonization" and "The relationship between wood structure and nano-carbon structure".The high crystallization of nano-carbon structure. of wood-based carbonized materials were accelerated by the synergic effects of the addition of a small amount of the catalysts of Fe, Ni and Co, and the application of flash pyrolysis, and 10 percent of the catalysts amount were only required to attain the same level of the crystallization by conventional heating process. However, when the large amount of the catalyst were conducted in the carbonization treatment, the distinct differences of the carbonization process were not detec … More ted between flash pyrolysis and conventional heating, perhaps due to the suppression of the radical reactions which were assumed to be the main carbonization reactions. The different types of the catalysts should be studied to accelerate the radical reactions.The wood cell walls are consisted of the different types of high-polymers of cellulose, hemicellulose and lignin, and they are distributing inhomogeneously in the wall bulk, and also the carbon-structure are considered to develop rapidly in the range of the heating temperatures of 700-1800℃. When the wood-based carbon structures were observed, the well-aligned graphitic planes were uniformly distributed in the cell walls. Whereas, the stack of the highly-aligned carbon planes were observed along the lumen surfaces of the cell walls, presumably by the condensation of the low-molecular carbon fragments which were evaporated from the wood substances by the heating treatment. These results are suggesting that the high-crystallization of nano-carbon structure should be accelerated by the conduction of flash pyrolysis in the higher temperature zones. Less

为开发利用木质生物质闪速热解制备纳米胶囊包覆金属材料，以木质生物质高结晶度为目标，开展了两项研究工作。研究项目为“应用闪速热解和催化剂石墨化碳化制备高结晶度的木质碳纤维材料”和“木材结构与纳米碳结构的关系”。添加少量的Fe、Ni、Co催化剂与快速热解的协同作用，加速了木质材料的结晶化，而采用常规加热工艺，只需添加10%的催化剂即可达到相同的结晶化程度。但当催化剂用量较大时，炭化过程的差异并不明显， ...更多信息这可能是由于抑制了被认为是主要碳化反应的自由基反应。木材细胞壁是由纤维素、半纤维素和木质素的不同类型的高聚物组成的，它们在壁体中分布不均匀，在700-1800℃的加热温度范围内，碳结构发展迅速。当观察到木材基碳结构时，排列良好的石墨平面均匀地分布在细胞壁中。然而，观察到高度排列的碳平面的堆叠沿着细胞壁的内腔表面，推测是通过加热处理从木材物质蒸发的低分子碳碎片的冷凝。这些结果表明，在较高的温度区进行快速热解可以促进纳米碳结构的高度结晶。少