固体渗硼提高多孔炭抗氧化性能的研究

Research on improving the antioxidative ability of porous carbon by solid boron-doping

空气中多孔炭在高温下极易被氧化,极大地限制了其在催化领域的应用。为了提高多孔炭在高温下的抗氧化能力,以KOH化学活化法制备的多孔炭为原料,通过固体渗硼对多孔炭进行热处理。结果表明,渗硼后多孔炭表面的活性点数量明显减少,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。并且渗剂在多孔炭中的质量分数为10%、渗剂中B4C的质量分数为25%、热处理5 h时,与多孔炭原料相比,渗硼后600℃多孔炭氧化失重率由70%左右降低到20%左右,比表面积降低10%-20%,多孔炭材料的微反活性仍可达到70.25。

At high temperature, porous carbon can be easily oxidized, which limits its industrial applications in catalysis. In this paper, in order to increase the antioxidative ability of porous carbon, boron in solid state was added to porous carbon by KOH 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 sites on the surface of porous carbon gradually reduced after the heat treatment, inhibiting the reaction between the oxidative gas and the porous carbon. When the content of boron-doping is 10% in the porous carbon and the content of B4C is 25% in the bo- ron-doping, the relative weight loss of the porous carbon decreased from about 70% to about 20%, the surface area of the porous carbon decreased 10% - 20%, Micro-reactive activation of the porous carbon still remained at 70.25 after 5 h, boron-doping treatment, comparing to the raw material at 600℃.