三水碳酸镁催化酚醛聚合制备多孔炭及其性能研究

利用水合碳酸镁催化功能及易分解特性,实现间苯二酚-甲醛体系的快速凝胶,通过炭化得到孔隙发达,比表面积大的整体式多孔炭(MCM-Mg)。系统研究了原料浓度、催化剂用量、反应温度、反应时间、炭化温度以及炭化时间工艺等因素对多孔炭性能的影响。结果表明,适宜的制备条件是反应温度85℃、反应时间0.5 h、间苯二酚质量3 g、催化剂用量3 g,炭化温度900℃,炭化时间1.5 h,获得密度为1.23 g/cm³、气孔率为39.71%、收率为29.07%、比表面积为193.475 m²/g,平均孔径为22.696 nm,抗压强度为25.68 Mpa的多孔炭。该工艺具有反应时间短、成本低廉和绿色环保等优点。

Preparation and Property of Porous Carbon with Phenolic Polymerization Catalyzed by Hydrated Magnesium Carbonate

The rapid gelation of the resorcinol-formaldehyde system was realized by the catalytic function and easy-decomposability of hydrated magnesium carbonate, and the monolithic porous carbon (MCM-Mg) with developed pores and large specific surface area was obtained by carbonization. The effects of raw material concentration, catalyst dosage, reaction temperature, reaction time, carbonization temperature and carbonization time on the properties of porous carbon were systematically studied. The results showed that the suitable preparation conditions were reaction temperature of 85℃, reaction time of 0.5 h, resorcinol mass of 3 g, catalyst dosage of 3 g, carbonization temperature of 900℃, carbonization time of 1.5 h. Under the optimum conditions, the porous carbon could be obtained with the density of 1.23 g/cm3, the porosity of 39.71%, the yield of 29.07%, the specific surface area of 193.475 m2/g, the average pore size of 22.696 nm, the compressive strength of 25.68 Mpa. The process has the advantages of short reaction time, low cost and environmental protection.