关键词: 微波, 污泥残渣, 甲烷, 裂解, 氢

Abstract: Thermo-catalytic decomposition of methane is an effective way to produce hydrogen-rich gas. The aim of this work was to study the microwave-assisted decomposition of methane over a char produced from sludge pyrolysis in a fixed-bed quartz-tube reactor. The influencing factors，including microwave power，atmospheric condition，particle size，and CH4 concentration，on the conversion of CH4 to H2 were investigated. CH4 conversion increased with increasing microwave power and decreasing particle sizes. Under different atmospheric conditions，the char exhibited different temperature rising characteristics. A higher average temperature was achieved in N2 or H2 atmosphere than in CH4 atmosphere. CH4 conversion increased with increasing CH4 concentration. SEM results showed that during CH4 decomposition reaction，carbon produced from CH4 decomposition would deposit on the surface of the catalyst. The spent char had lower surface area and larger pore diameter than those of fresh ones. This observation suggests that carbon deposition would prohibit the contact between active center of char and CH4，leading to deactivation of the char.

Key words: microwave-assisted, pyrolysis residue of sewage sludge, methane, decomposition, hydrogen