用CrO_3作氧化剂制备无硫可膨胀石墨  

Preparation and Research of Sulfur-free and Expansible Graphite by Using Chromic Anhydride as Oxidant

作　　者：王太津[1] 陈灵晶[1] 王力[1] 潘家荣[1] 

机构地区：[1]三峡大学化学与生命科学学院,湖北宜昌443002

出　　处：《广州化工》2010年第2期103-105,共3页GuangZhou Chemical Industry

基　　金：武汉科技大学湖北省耐火材料与高温陶瓷重点实验室项目资助

摘　　要：介绍了一种新的制备方法:以混酸系(高氯酸/磷酸)为插入剂,在氧化剂三氧化铬的作用下,与天然鳞片石墨反应制备无硫可膨胀石墨,最佳反应条件为:石墨(g)∶70%的HClO4(mL)∶98%的H3PO4(mL)∶CrO3(g)=1∶0.5∶0.4∶0.15,反应温度为86℃,反应时间为60min,膨胀倍率高达334mL/g,最终产品不含硫。迄今为止,未见相同的文献报道。A new method of preparation of sulfur - free and expansible graphite was introduced by using chromic anhydride as the oxidant, a mixture of 70% perchloric acid and 98% phosphoric acid as insertion reagents. The optimum conditions of the preparation were as follows： the mixing ratio of graphite （g）, perchloric acid （mL）, phosphoric acid （mL） and chromic anhydride（g） was 1： 0.5 ： 0.4 ： 0.15, reacting temperature was 86℃, reacting time was 60 min. The expansion volume and sulfur content of the expansible graphite were 334mL/g and 0% respectively. To date, similar report was not seen in the literature.

关 键 词：高氯酸 磷酸 三氧化铬 制备 无硫可膨胀石墨 

分 类 号：TQ165[化学工程—高温制品工业] TQ432.2