Abstract Temperature rise characteristics of subbituminous coal impregnated with KOH in a wide range of KOH/coal ratio (w/w, 0.25∼2) under microwave (MW) heating were investigated and the catalytic performance in methane decomposition (CMD) over the resultant activated carbon (AC) was measured. The results showed that with the increase of KOH content, the temperature rise ability of the coal-KOH adduct under MW-field increases gradually, and the maximum temperature that can be increased from 170℃ to 880℃. The increase of aromaticity due to the structural rearrangement of the coal aromatic layers during KOH impregnation and the release of volatiles during MW-heating provides the main driving force for the continuous increase of temperature. When KOH/coal ratio is 1.5, it took 224 s for coal-KOH adduct to rise from room temperature to 800℃, with the development of specific surface area (SBET) and pore volume to the maximum of 661.8 m2/g and 0.512 cm3/g, respectively. However, the catalytic activity of AC with the largest SBET for CMD is not the highest. At 800℃ and higher temperatures, the increase of active site number on the surface by the potassium intercalation mechanism promotes the catalytic activity of AC. Therefore, the research core of carbon-based catalysts from coal is to increase the number of active site, not the SBET alone.

中文翻译：

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煤-KOH加合物微波加热升温特性及合成活性炭催化甲烷分解性能

摘要 研究了在大范围 KOH/煤比（w/w，0.25∼2）下浸渍 KOH 的次烟煤在微波 (MW) 加热下的温升特性，并研究了活化后的甲烷分解 (CMD) 催化性能。测量碳（AC）。结果表明，随着KOH含量的增加，煤-KOH加合物在MW场下的升温能力逐渐增强，最高温度由170℃提高到880℃。由于KOH浸渍过程中煤芳烃层的结构重排和MW加热过程中挥发物的释放导致芳香度的增加为温度的持续升高提供了主要驱动力。当KOH/煤比为1.5时，煤-KOH加合物从室温上升到800℃需要224 s，随着比表面积 (SBET) 和孔容分别发展到 661.8 m2/g 和 0.512 cm3/g 的最大值。然而，具有最大SBET的AC对CMD的催化活性并不是最高的。在800℃及更高温度下，通过钾插层机制增加表面活性位点数量，促进了活性炭的催化活性。因此，煤制碳基催化剂的研究核心是增加活性位点的数量，而不仅仅是SBET。通过钾嵌入机制增加了表面活性位点数量，促进了活性炭的催化活性。因此，煤制碳基催化剂的研究核心是增加活性位点的数量，而不仅仅是SBET。通过钾嵌入机制增加了表面活性位点数量，促进了活性炭的催化活性。因此，煤制碳基催化剂的研究核心是增加活性位点的数量，而不仅仅是SBET。