吸附型复合催化剂光催化消除煤矿瓦斯的机理  

Mechanism on photocatalytic elimination of coal-mine gas over adsorption-type composite catalysts

作　　者：杨娟 郝静怡[1,2] 魏建平 王云刚 戴俊[1,2] YANG Juan;HAO Jingyi;WEI jianping;WANG Yungang;DAI Jun(State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Henan Polytechnic University,Jiaozuo 454000,China;School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;The Collaborative Innovation Center of Coal Safety Production of Henan,Jiaozuo 454000,China)

机构地区：[1]河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地,河南焦作454000 [2]河南理工大学安全科学与工程学院,河南焦作454000 [3]煤炭安全生产河南省协同创新中心,河南焦作454000

出　　处：《煤炭学报》2018年第8期2250-2255,共6页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(U1704129);中国博士后科学基金资助项目(2017M622344);教育部创新团队发展支持计划资助项目(IRT_16R22)

摘　　要：为研究自制的氧化镓/煤基活性炭吸附型催化剂(15%Ga_2O_3/AC)光催化消除矿井瓦斯机理,开展了复合催化剂光助消除模拟矿井瓦斯中甲烷气体的实验。采用X-射线衍射(XRD)、高分辨透射电镜(HRTEM)、N_2吸附-脱附技术对催化剂的复合效果、微观界面结构、孔体积、孔径分布和比表面进行表征,利用荧光发射谱、电子自旋共振谱(ESR)对光生电荷分离、光电子迁移和活性物种的产生进行测定;结合对甲烷降解动力学的分析可知,15%Ga_2O_3/AC可循环多次用于低浓度煤矿瓦斯的光助消除,煤基活性炭在增强复合催化剂对CH_4分子吸附能力的同时还促进光生电荷分离以产生更多光空穴(h+)和超氧自由基(O_2^(·-)),使CH_4经h+抽氢产生的·CH_3进一步被O_2^(·-)氧化,提高催化剂消除瓦斯性能,为利用光氧化技术治理矿井局部瓦斯提供理论依据。To investigate the mechanism for the photocatalytic degradation of coal-mine gas over self-made adsorptiontype composite catalyst（ 15% Ga2O3/AC）,the experiments of photo-assisted removing methane in simulated coal-mine gas are carried out.The compound effect,interfacial microstructure,pore volume,pore size distribution and specific surface area of composite catalysts are characterized by X-ray diffraction（ XRD）,high-resolution transmission electron microscopy（ HRTEM） and low temperature N2 adsorption-desorption technique,respectively.The separation of photo-induced charge carriers,the transfer of photo-generated electrons and the generation of reactive species are studied by using photoluminescence spectrum（ PLs） and electron spin resonance（ ESR） spectra.Based on the analysis of methane degradation kinetics,the effective photo-assisted degradation of low concentration coal-mine gas can be implemented repeatedly,keeping almost unchanged removal efficiency.The introduction of coal-based AC can enhance the adsorption of methane,meanwhile improve the separation of photo-generated charge carriers,which contributes to producing more photo-hole（ h^＋） and superoxide radical（ O2^·-）.The generated ·CH3 via CH4 hydrogen abstraction by h＋is further oxidized through the reaction with O2^·-,promoting the removal efficiency of methane.These results provide a theoretical basis for the gas control in the local region of coal mine using photo-oxidation technology.

关 键 词：瓦斯 机理研究 光催化 煤基活性炭 复合催化剂 

分 类 号：TD712[矿业工程—矿井通风与安全]