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

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.