CATALYTIC GRAPHITIZATION OF CARBONS BY VARIOUS METALS
CATALYTIC GRAPHITIZATION OF CARBONS BY VARIOUS METALS
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DOI：
10.1016/0008-6223(79)90020-4
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发表时间：
1979-01-01
期刊：
影响因子：
10.9
通讯作者：
OTANI, S
中科院分区：
文献类型：
--
作者：
OYA, A;OTANI, S
研究了22种金属对炭的催化石墨化作用。在氩气气氛下，在2600°C下进行热处理1小时，并在3000°C下进行热处理10分钟。在3，5-二甲基酚醛树脂碳粉中加入20重量%的金属粉末（Al、Cr、Mn、Fe、Co、Ni、Ca、Ti、V、Mo和W），在石墨化过程中催化生成石墨碳。前六种金属属于碳溶解-沉淀机制，在反应的早期阶段产生大的石墨晶体片;其他金属通过碳化物形成-分解机制产生细晶体。在非石墨化酚醛树脂炭中，Mg、Si、Ca、Cu、Ge只催化生成石墨炭，Al、Ti、V、Cr、Mn、Fe、Co、Ni、Mo、W同时生成石墨炭和乱层炭。除Al和Cu外，前一种效应主要由非过渡金属起作用，后一种效应主要由过渡金属起作用。硼对两种炭的均相石墨化有明显的促进作用，而Zn、Sn、Sb、Pb和Bi对石墨化无催化作用。在此基础上，讨论了金属的某些性质与其催化能力和催化效果的关系。
A study was made of the catalytic graphitization of carbons by 22 kinds of metals. Heat treatments were carried out at 2600°C for 1 hr and 3000°C for 10 min under argon atmosphere. In graphitizing 3,5-dimethylphenol-formaldehyde resin carbon powder with which 20w/o metal powder (Al, Cr, Mn, Fe, Co, Ni, Ca, Ti, V, Mo and W) was mixed, graphitic carbon was catalytically formed. The first six metals, which belong to the carbon dissolution-precipitation mechanism, gave large graphitic crystal flakes at an early stage of the reaction; the other metals resulted in fine crystals through the carbide formation-decomposition mechanism. For the non-graphitizing phenol formaldehyde resin carbon in which 10w/o metal powder was dispersed, Mg, Si, Ca, Cu and Ge catalyzed formation of only graphitic carbon; and Al, Ti, V, Cr, Mn, Fe, Co, Ni, Mo and W formed both graphitic and turbostratic carbons. Except for Al and Cu, the former effect was exerted by non-transition metals and the latter effect by transition metals. Boron alone markedly accelerated homogeneous graphitization of both kinds of carbon; and Zn, Sn, Sb, Pb and Bi had no catalytic effect. On the basis of these results, the relationships between some properties of the metals, their catalytic abilities and the kind of catalytic effects are discussed.