煤的光-热耦合氧化研究

Study on photo coupled thermo-oxidation of Shenfu coal

研究了神府煤光氧化和热氧化耦合反应性.在O2气氛中,CO2释放量大幅度增加,气体产物主要为CO2和CO,同时有CH4释放,各组分的浓度大小表现为:CO2 CO>CH4,其中CO2的浓度随反应温度升高而增加,并在反应2 h时达到最大值,紫外光照射可明显促进CO2和CO释放,温度升高,CO和CH4释放速率增加.光氧化主要生成CO和腐植酸,热氧化导致C—C键断裂生成CH4,特别是在高温条件下,能把CO和腐植酸进一步氧化为CO2.光氧化和热氧化耦合不仅提高了反应气体产物的选择性,而且对提高煤中总腐植酸含量有明显的协同作用,同时导致酚羟基官能团的形成.

The reactivity of Shenfu coal in photo coupled thermo-oxidation was investigated. In oxygen atmosphere, the release amount of CO2 greatly increase, and the main gas products are CO and CO2 with some CH4. The concentration of gas products is in the order of CO2》CO 〉 CH4. The CO2 concentration increases with increasing temperature, and reaches maximum after 2 h. UV irradiation can obviously promote the release of CO2 and CO. The release rates of CO and CH4 increase with increasing temperature. The main products of photo-oxidation are CO and humic acids, while thermo-oxidation may generate CH4 caused by the breaking of C--C bonds, and especially at high temperature CO and humic acids are further oxidized into CO2. Photo coupled thermo-oxidation improve the selectivity of gas products and demonstrate obvious synergistic effect to increase humie acids content of coal, and meanwhile lead to the formation of phenolic hydroxyl.