摘要
催化燃烧是目前转化与利用低浓度瓦斯的有效方法之一。为探究制备工艺对Co-Cu复合氧化物催化剂催化低浓度瓦斯燃烧性能的影响,分别采用溶胶-凝胶法和共沉淀法,制备了Co-Cu复合催化剂,并用于低浓度瓦斯催化燃烧反应(甲烷体积分数为1.69%)。考察了制备方法、焙烧温度和n(Co):n(Cu)对催化剂性能的影响,并运用扫描电子显微镜(SEM)、X射线衍射(XRD)、氢气程序升温还原(H_(2)-TPR)和X射线光电子能谱(XPS)对催化剂进行了表征。结果表明,适宜的催化剂焙烧温度为400℃、n(Co):n(Cu)为1:1,该条件下制备的催化剂催化活性最高。在该条件下,与溶胶-凝胶法制备的催化剂(n(柠檬酸):n(金属离子)为3:2)相比,共沉淀法制备的催化剂具有更高的催化活性,其甲烷转化特征温度t_(10)、t_(50)和t_(90)(分别指甲烷转化率为10%、50%、90%时的温度)分别降低了6℃、70℃和1℃。
Catalytic combustion is one of the effective methods to convert and utilize low concentration gas at present.In order to investigate the effect of preparation technology on the catalytic performance of Co-Cu composite oxide catalyst for low concentration gas combustion,the Co-Cu composite catalyst was prepared by sol-gel method and coprecipitation method respectively and used for low concentration gas catalytic combustion reaction(methane volume fraction is 1.69%).The effects of the preparation method,calcination temperature and n(Co):n(Cu) on the catalyst performance were investigated.The catalyst was characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),hydrogen programmed temperature reduction(H_(2)-TPR) and X-ray photoelectron spectroscopy(XPS).The optimum calcination temperature and n(Co):n(Cu) are 400℃ and 1:1,respectively.The catalyst prepared under these conditions has the highest catalytic activity.The results show that the catalysts prepared by coprecipitation method have higher catalytic activity than that prepared by sol-gel method(n(citric acid):n(metal ion) is 3:2).The characteristic methane conversion temperatures of t_(10),t_(50) and t_(90)(at which methane conversion rate is 10%,50%,and 90%respectively) are lower by 6℃,70℃ and 1℃,respectively.
作者
徐锋
彭思惠
刘培
XU Feng;PENG Sihui;LIU Pei(School of Safety Engineering,Heilongjiang University of Science and Technology,Harbin 150022,Heilongjiang,China)
出处
《低碳化学与化工》
CAS
北大核心
2023年第4期63-68,共6页
Low-Carbon Chemistry and Chemical Engineering
基金
国家自然科学基金(51874126)
黑龙江省自然科学基金(LH2022E107)
黑龙江省省属高等学校基本科研业务费项目(2021-KYYWF-1463,2021-KYYWF-1479)。
