Ca(OH)_(2)对煤基活性炭及其催化甲烷裂解制氢的影响

Effects of Ca(OH)_(2)on coal-based activated carbon and its catalytic property in methane decomposition to hydrogen

为提高煤基活性炭(AC)在催化甲烷裂解制氢反应中的活性,通过煤原位添加Ca(OH)_(2)调控KOH化学活化法所制活性炭(xCa-AC)的结构和表面性质。利用FT-IR、XRD、SEM等对其进行分析,结果表明,煤原位添加Ca(OH)_(2)可提高xCa-AC的比表面积和孔容,也可提高xCa-AC表面的含氧基团浓度和炭结构的无序性。在催化甲烷裂解制氢过程中,xCa-AC较AC有更高的转化率,而且积碳中碳纤维的数量增加。

In order to improve the activity of coal-based activated carbon(AC)in catalytic decomposition of methane to produce hydrogen,the structure and surface properties of activated carbon(xCa-AC)prepared by KOH chemical activation method are adjusted by adding Ca(OH)_(2) in situ to the coal.FT-IR,XRD,SEM and other analysis results show that the in-situ addition of Ca(OH)_(2) on coal can increase specific surface area and pore volume of xCa-AC,as well as the concentration of oxygen-containing groups on the surface of xCa-AC and the disorder of carbon structure.In the process of catalytic decomposition of methane to hydrogen,xCa-AC contributes a higher conversion rate than AC,and increases the number of carbon fibers in the carbon deposit.