石油焦系活性炭抗氧化性能研究

活性炭在高温下极易被氧化,极大的限制了其在催化领域的应用,为了提高活性炭在高温下的抗氧化能力,文章以NaOH化学活化法制备的活性炭为原料,通过固体渗硼对活性炭进行基体改性。实验结果表明：渗硼后活性炭表面的活性点数量明显减少,抑制了氧化性气体与活性炭的反应,从而提高了活性炭的抗氧化能力。并且渗剂在活性炭中含量为10%、渗剂中B4C含量为25%、热处理时间为5 h时,与活性炭原料相比,基体改性后600℃活性炭氧化失重率由70%左右降低到20%左右,比表面积降低10%~20%,活性炭材料的微反活性仍可达到70.25。

Research on Improving the Antioxidative Ability of Activated Carbon from Petroleum Coke

Under high temperature,activated carbon can be easily oxidized,which limits its industrial applications in catalytic fields.In the paper,in order to increase the antioxidative ability of porous carbon,boron in solid state was added to porous carbon by NaOH chemical activation.It has been proved that the antioxidative ability of porous carbon can be effectively increased by boron-doping because the quantity of active point of the surface of porous carbon gradually reduced after heat reatment,inhibiting the reaction between oxidized gas and porous carbon.And the content of boron-doping was 10 % in the porous carbon,the content of B4C was 25 % in the boron-doping,the time of heat treatment was 5 h.After boron-doping treatment,compared to raw material at 600 ℃ the relative weight loss of porous carbon is decresing from about 70 % to about 20 %,the surface area of porous carbon decreased 10 %~20 %,Micro-reactive activation of porous cabon still reached 70.25 %.