改性的CuO/γ-Al_2O_3催化乏风瓦斯的燃烧性能  

Combustion performance of ventilation air methane over modified CuO/γ-Al_2O_3 catalyst

作　　者：徐锋 李凡 田瑶瑶 毕方强 朱丽华 Xu Feng;Li Fan;Tian Yaoyao;Bi Fangqiang;Zhu Lihua(School of Safety Engineering,Heilongjiang University of Science&Technology,Harbin 150022,China)

机构地区：[1]黑龙江科技大学安全工程学院,哈尔滨150022

出　　处：《黑龙江科技大学学报》2018年第2期189-194,共6页Journal of Heilongjiang University of Science And Technology

基　　金：国家自然科学基金项目(51504087)

摘　　要：为改善Cu基催化剂活性,在确定最佳Cu负载量的基础上,采用冷等离子体技术改性CuO/γ-Al_2O_3催化剂,利用SEM、BET、XRD和XPS技术表征催化剂,研究冷等离子体改性作用对催化剂催化乏风瓦斯燃烧性能的影响。结果表明,Cu的质量分数为7%时,常规催化剂CuO/γ-Al_2O_3催化乏风瓦斯燃烧的活性最强。经等离子体处理后,其催化乏风瓦斯燃烧的特征温度和表观活化能进一步降低。等离子体改性最佳工况条件为放电电压45 k V、放电频率14.71 k Hz、处理时间30 min、氧气空速20 m L/(min·g)。该研究验证了等离子体可通过增大催化剂比表面积和改变孔径、孔容的改性作用,影响乏风瓦斯中甲烷在催化剂表面的吸附、活化和转化。This paper deals with an improvement in the catalytic performance of CuO/γ-Al2O3.The research building on the determination of the optimal amount of Cu load involves modifying the CuO/gamma-Al2O3 catalyst using cold plasma technology;characterizing the catalyst using SEM,BET,XRD and XPS;and thereby identifying the effect of Cu loading and plasma modification process on the activity of CuO/γ-Al2O3 catalyst.The results show that with Cu mass fraction of 7%,non-modifiedγ-Al2O3 catalyst offers the strongest activity of catalytic combustion of ventilation gas;the catalyst treated by plasma provides a further reduction in the characteristic temperature and apparent activation energy of catalytic combustion reaction;the plasma modification works on the optimum process conditions:discharge voltage 45 kV,discharge frequency 14.71 kHz,plasma treatment time 30 min,and oxygen space velocity 20 mL/(min·g);and the modification effect of O2 plasma on the catalyst is accomplished mainly by increasing the specific surface area,changing the pore size and pore volume,contributing to an effect on the adsorption,activation and conversion of methane on the surface of the catalyst.

关 键 词：瓦斯 催化燃烧 CUO/Γ-AL2O3 冷等离子体 改性 

分 类 号：TD712[矿业工程—矿井通风与安全]