PREPARATION OF FULLERENES BY INCOMPLETE

不完全富勒烯的制备

基本信息

批准号：
08554030
负责人：
OSAWA Eiji
金额：
$ 2.82万
依托单位：
TOYOHASHI UNIVERSITY OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

The purpose of this project is to improve the method of manufacturing fullerenes, especially buckminsterfullerene C60, by incomplete combustion of hydrocarbons, so that fullerenes can be produced in large scale by continuous scheme in the near future.In the first year of the project, we concentrated on the analysis of fullerenes in commercial soot products with the hope of obtaining clues for fuel, burning temperatures, purification and other conditions. After examining a number of traditional as well as modern products from soots, we found that Chinese ink sticks and some charcoals constantly analyzed positively for buckminsterfullerene and sometimes C70 as well. New ink sticks usually contain about 0.1ppm of C60. This level of C60 can be produced by simple burning of benzene, cyclohexane and other hydrocarbons in small flames in air and also agrees with the level detected in ancient geological objects like the black clay from K-T layr, which has been considered to arise from wildfire … More caused by bolide impact. Interestingly enough we found that the C60 contents in Chinese ink sticks decrease with time over a period of several hundred years conforming to the rate law of the first order. We interpret the decrease not by spontaneous decomposition but by Brownian type movements of spherical and smooth C60 molecules in the microstructure of ink sticks.In the second year, we performed numerous burning tests using simple free burning apparatus, while changing fuels and catalysts. Preliminary as they are, we obtained two encouraging results by using metallocene catalysts : (1) addition of catalytic amounts of ferrocence led to up to 500% increase in the yield of C60, and (2) addition of catalytic amounts of nickellocene and titanocene decreased the yields of 60, but produced a new intense peak in the HPLC analysis of the extract with Rf value of 0.65 relative to C60, which is supposed to be an intermediate similar to what was once reported by Howard et al.As the results of these preliminary experiments, we have designed an experimental burning apparatus, which is safe and can be conveniently used for seeking various burning conditions for searching catalysts. Less

该项目的目的是通过不完整的碳氢化合物组合来改善制造富勒烯的方法，尤其是Buckminsterfullerene C60，以便可以通过在不久的将来继续制定富勒烯，在项目的第一年继续进行大规模生产。在检查了一些传统和现代产品的烟灰中，我们发现中国墨水棒和一些木炭不断对Buckminsterfullerene进行积极分析，有时也对C70进行了积极分析。新墨水棒通常包含约0.1ppm的C60。这种水平的C60可以通过空气中小火中的苯，环己烷和其他碳氢化合物的简单燃烧产生，并且也与古代地质物体（如K-t Layr的黑色粘土）中检测到的水平一致，这被认为是由野火引起的……更多受玻利德影响造成的。有趣的是，我们发现中国墨水棒中的C60内容在数百年的时间内随时间减少，符合第一阶的速率定律。我们不是通过赞助分解来解释下降，而是通过墨水棒微观结构中球形和光滑的C60分子的布朗型运动来解释下降。第二年，我们使用简单的免费燃烧设备进行了许多燃烧测试，同时更换燃料和催化剂。初步时，我们通过使用金度型催化剂获得了两个令人鼓舞的结果：（1）增加超幼体的催化量导致高达500％的C60产量增加500％，（（2）添加了Nickellocene和Titanecene的催化量减少了60次，但在60中降低了60的峰值，从而降低了hh 5的峰值。被认为是一种类似于霍华德等人报道的中间体。由于这些初步实验的结果，我们设计了一种实验性燃烧设备，该设备是安全的，可以方便地用于寻找各种燃烧条件以搜索催化剂。