等离子体辅助CuO/γ-Al_(2)O_(3)催化剂制备及催化乏风瓦斯燃烧性能  

Preparation of CuO/γ-Al_(2)O_(3) catalyst by impregnation plasma-assisted and its performance in the combustion of ventilation air methane

作　　者：朱丽华 刘培 聂欣雨 毕方强 徐锋 ZHU Li-hua;LIU Pei;NIE Xin-yu;BI Fang-qiang;XU Feng(School of Safety Engineering and Technology,Heilongjiang University of Science and Technology,Harbin150022,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：《安全与环境学报》2022年第3期1543-1550,共8页Journal of Safety and Environment

基　　金：国家自然科学基金项目(51504087)。

摘　　要：为探究不同制备工艺对Cu基催化剂催化乏风瓦斯燃烧性能的影响,采用常规过量浸渍法和等离子体辅助浸渍法分别制备CuO/γ-Al_(2)O_(3)催化剂和CuO/γ-Al_(2)O_(3)-P催化剂,并利用固定床反应器评价催化剂催化乏风瓦斯燃烧的活性,结合X-射线衍射(XRD)和X-射线光电子能谱(XPS)表征结果,分析Cu负载量及改性工艺对催化剂催化乏风瓦斯燃烧性能的影响。结果表明,对于普通浸渍法制备的催化剂,Cu负载量为7%时催化活性最强。对于等离子体辅助浸渍法制备的催化剂,焙烧后等离子体处理的改性方式更利于改善催化剂活性,且催化活性随放电电压增加而增强。但放电电压超过45 kV时,过强的能量轰击致使部分活性组分从催化剂载体表面脱落,将导致催化剂的活性减弱。This paper seeks to study the effect of the preparation process on the performance of copper-based catalysts for the combustion of ventilation air methane.The study consists of preparing the CuO/γ-Al_(2)O_(3)catalyst by the conventional excess impregnation method;preparing the CuO/γ-Al_(2)O_(3)-P catalyst,a copper-based catalyst modified using plasma enhancement method;evaluating the activity of the CuO/γ-Al_(2)O_(3) and CuO/γ-Al_(2)O_(3)-P catalysts for the combustion of ventilation air methane by the fixed bed reactor;characterizing the CuO/γ-Al_(2)O_(3) and CuO/γ-Al_(2)O_(3)-P catalysts by XRD and XPS,and researching the effect of Cu load and plasma modification process such as different discharge voltage and plasma processing sequence on the activity of catalyst.The results show that the CuO/γ-Al_(2)O_(3) catalyst prepared by the conventional excess impregnation method does not contain Cu+and Cu~0.According to the contrast of T_(50) and T_(90) of this kind of catalyst with different Cu loads,we can conclude that the catalytic activity is the strongest when the Cu load is 7%,which performs better than other loads.For catalysts prepared by the plasma-assisted impregnation method,the plasma modification of catalyst after calcination works better than the calcination after plasma modification of catalyst in catalytic activity.The reason is that the former method is beneficial for Cu to enrich on the surface of catalytic and CuO to grain reduction,which is helpful to improve the activity of the catalyst.With the increase of discharge voltage,the injection energy of the system has also been enhanced,which makes the activity of the catalyst increase.However,when the discharge voltage exceeds 45 kV,the active component on the surface of the catalyst will be reduced due to the excessive injection energy,and the activity of the catalyst will become worse.It is also found that plasma modification and its sequence do not change the elemental composition of the catalyst’s surface and the chemical valence of coppe

关 键 词：环境工程学 CuO/γ-Al_(2)O_(3) 等离子体 改性 乏风瓦斯 催化燃烧 

分 类 号：X936[环境科学与工程—安全科学]