摘要
采用悬浮式非均相体系分别对水合神府烟煤(SFC)及锡林浩特褐煤(XL)进行选择性光催化氧化、傅里叶红外光谱(FTIR)分析及气相色谱质谱联用(GS/MS)检测,获得了反应产物的分子结构信息。同时对不同条件下煤炭降解效果的研究发现:芳香度和芳环取代度较高的烟煤组分光氧化性较弱,氧化后的产物中有较多酮类生成,而芳环取代度小、含有较多亚甲基和脂肪族侧链的褐煤光氧化性能较强,生成物中烯烃的含量明显减少;催化剂二氧化钛对光催化反应的影响要大于氧化剂过氧化氢,但在仅有过氧化氢存在情况下,随着其加入量的增大光氧化效果会更显著,煤样的投加量对光催化的影响不占主导地位;光催化氧化中,煤大分子中的烷基侧链易断裂脱除,特别是甲基和亚甲基易发生光催化氧化分解,而且碳氧单键的红外吸收峰强度明显减弱,表明煤大分子的侧链和碳氧单键在紫外光辐射环境下反应活性高。
Shenfu bituminous coal(SFC) and Xilinhot lignite(XL) were oxidized selectively using hydrogen peroxide in heterogeneous hydration suspension system and analyzed with FTIR and GC/MS technologies,meanwhile the oxidation effect of different conditions were also discussed.The results indicate that the photo-catalytic oxidation activity of the bituminous coal with high aromaticity correlation and alkyl substitutions on aromatic fractions is lower than that of Xilinhot lignite with lower alkyl substitutions on aromatic fractions and large of mehtyl and methylene.In the products a number of organic ketones are enough besides biphenyls in SFC,but the relative content of the alkenes is reduced obviously in XL.And the effect factors are in the order amount of photocatalyst>dosage of H2O2>amount of coal.However with the increasing of H2O2 dosage the oxidation of coals is much more significant.In the experiment the organic maters with branched-chain alkanes are subjected to oxidize,especially the molecular with methyls or methylenes.It is a proof the absorbance intensity of C—O was reduced dramatically for branched-chain and C—O single band being high activity to UV light.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2011年第5期849-854,共6页
Journal of China Coal Society
基金
国家重点基础研究发展计划(973)资助项目(2004CB217601)
国家自然科学基金资助项目(50974121)
江苏省普通高校高新技术产业发展重点资助项目(JHB05-33)
