基于活性炭的微波辐射CO2重整CH4的研究

Reforming of CH_4 with CO_2 over Activated Carbon Under Microwave Irradiation

以木质活性炭为催化剂,在微波加热实验台上进行了CO2重整CH4的实验研究,考察了活性炭的升温特性,比较了CH4裂解、CH4/CO2重整和CO2气化反应中反应气转化率,分析了反应温度、CH4与CO2物质的量比值和空气流速对重整反应的影响,测试了活性炭的催化活性.结果表明,微波辐射下活性炭床层温度迅速升高;重整反应中CH4转化率高于裂解反应,而CO2转化率低于气化反应;提高反应温度、减小CH4与CO2物质的量比值和降低空气流速均利于提高CH4和CO2转化率,同时降低合成气中H2与CO物质的量比值;初始阶段活性炭表现出较好的催化活性,40 min后活性炭迅速失活.

The microwave-assisted heating system was applied to investigate the reforming of CH4 with COE over the wood-derived activated carbon, which was served as the catalyst. As a preliminary study, temperature rising behavior of activated carbon was investigated, and the reactant gas conversions in the process of CH4 decomposition, CH4/COE reforming and CO2 gasification were compared.At the same time, the influence of temperature, CH4/COE molar ratio and volumetric hourly space velocity on the reforming of CH4 with CO2 was evaluated, and then catalytic activity of activated carbon was tested. The results indicate that the temperature of activated carbon layer rises rapidly. By comparing CH4 decomposition, CH4/COE reforming and COE gasification, it can be found that CH4 conversion in reforming reaction is higher than that in CH4 decomposition reaction, and CO2 conversion in reforming reaction is lower than that in COE gasification reaction.An increase in CH4 and CO2 conversions as well as a decrease in HE/CO ratio can be achieved through increasing temperature, decreasing CH4/COE ratio or reducing volumetric hourly space velocity. An encouraging catalytic activity of activated carbon is obtained at the beginning, followed by a sharp loss of catalytic activity after 40 min.