煤的液相光催化氧化研究

Photocatalysis oxidating of coal in liquid phase

在浆态流化床光反应器中,研究了时间、气氛和紫外光照射对光氧化煤样腐植酸产率和组成分布的影响。利用元素分析、UV-vis吸收光谱、FTIR和GC-MS分析了光氧化煤在液相氧化前后得到的腐植酸结构的变化。结果表明:在有氧和紫外光照射条件下,光-热氧化煤的腐植酸提取率最大,达9.6%。有氧和紫外光条件下有利于羟基自由基的生成;水可溶氧化产物数量减少,尤其是饱和烃类化合物。液相光催化氧化提高了液相氧化产物的选择性,这一结果与气相光催化氧化相一致。

Effects of reaction time,atmosphere and UV on the yield and composition of humic acid from phtoto-oxidation coal were studied in Slurry Fluidized Bed Photo reactor.The structures of humic acid before and after liquid-phase oxidation were characterized by elemental analysis,UV-vis absorption spectrometry,FTIR and GC/MS.The results show that oxygen and UV are beneficial to generate hydroxyl radicals and lead to the maximum yield of humic acid up to 9.6%.Water soluble oxidation products decrease,especially for saturated hydrocarbons.Liquid-phase photocatalytic oxidation improves the selectivity of liquid oxidation products,which is consistent with the result of gas-phase photocatalytic oxidation.