Abstract Activated carbon (AC) was prepared from a subbituminous coal with addition of Ca(NO3)2 by KOH activation, and used for catalytic methane decomposition to produce hydrogen. The effects of calcium addition amount on the structure and catalytic performance of the resultant ACs were investigated. As the addition of Ca(NO3)2, the surface area and pore volume of ACs increase significantly compared with that of AC without addition, especially the mesoporous surface area improved from 480 m2/g to 1119 m2/g. Almost hyaline structure of carbons are obtained when a high amount of calcium is added into the coal. The addition of calcium in coal leads to the significant increase of methane conversion over the resultant carbon catalysts, and when the calcium addition amount is 15 wt%, the prepared AC has the highest mesoporous surface area and the best stability. No direct relationship was found between specific surface area and the activity of carbons, but the mesopores benefit the stability of ACs in methane decomposition. Carbon fiber was produced on AC from the coal with addition of calcium compared with the aggregated carbon on that from coal without addition of calcium.

中文翻译：

---

煤中添加Ca(NO 3 ) 2 对活性炭甲烷分解制氢性能的影响

摘要 以亚烟煤为原料，加入Ca(NO3)2，通过KOH活化制备活性炭，用于催化甲烷分解制氢。研究了钙添加量对所得活性炭结构和催化性能的影响。随着Ca(NO3)2的加入，活性炭的表面积和孔容比未添加的活性炭显着增加，尤其是介孔表面积从480 m2/g提高到1119 m2/g。当大量的钙加入煤中时，碳几乎是透明的结构。煤中钙的加入导致甲烷转化率比所得碳催化剂显着增加，当钙加入量为15wt%时，制备的活性炭具有最高的介孔表面积和最好的稳定性。没有发现比表面积与碳活性之间的直接关系，但中孔有利于活性炭在甲烷分解中的稳定性。碳纤维是在活性炭上从添加钙的煤中生产出来的，而碳纤维是从不添加钙的煤中获得的聚集碳。