固体渗硼增强多孔炭的抗氧化性

摘要

Porous carbon prepared by KOH chemical activation was doped with boron using B4C as an additive (mass fraction of 10%) by heat treatment at 850℃ for 5 h to increase its antioxidative ability.This effect is a result of a decrease in the number of active sites on the surface of the carbon after heat treatment,which inhibits its reaction with the oxidizing gas.The volume of micro and mesopores and BET surface area decreased after the doping.Although the activity of the doped porous carbon in catalytic cracking evaluated in a microreactor decreased after the doping,it still reached a higher value (70%) than that of porous carbon.%以KOH化学活化法制备的多孔炭为原料,通过固体渗硼(渗剂的质昔分数为10%)而后850 ℃进行5h热处理以增加其抗氧化性能.结果表明:渗硼后多孔炭表面的活性点数世明显减少,有效抑制了氧化性气体与多孔炭的反应,从而提高了多孔炭的抗氧化能力.与多孔炭原料相比,尽管渗硼后微孔、中孔体积和比衷而积降低,但其微反活性仍可达到70%.