V/CGS低温NH3-SCR催化剂的制备及性能研究  

Preparation of V/CGS catalyst for low temperature NH-SCR and study on its activities

作　　者：高艳春 韩芳 韩丽娜[2] 常丽萍[1] 鲍卫任 王建成[1] GAO Yan-chun;HAN Fang;HAN Li-na;CHANG Li-ping;BAO Wei-ren;WANG Jian-cheng(Key Laboratory of Coal Science and Technology of the Ministry of Education and Shanxi Province,Taiyuan University of Technology,Taiyuan 030024,China;College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学煤科学与技术教育部和山西省重点实验室,山西太原030024 [2]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《现代化工》2020年第8期67-72,共6页Modern Chemical Industry

基　　金：国家能源投资集团有限责任公司科技创新项目(2020001);国家重点研究发展计划(2019YFC1904302)。

摘　　要：以煤气化渣(CGS)为载体,采用等体积浸渍法负载1%的钒制备V/CGS催化剂。考察了煅烧温度、预氧化温度对催化剂脱硝活性的影响。经活性评价发现,500℃煅烧、250℃预氧化后的催化剂低温脱硝活性最佳。此外,还考察了空速、SO2体积分数对V/CGS催化剂脱硝活性的影响。通过XRD、XPS、H2-TPR以及物理吸附等方法对催化剂结构进行表征。结果表明,V/CGS催化剂中钒主要以V^5+状态存在,经预氧化后V^5+含量相对增加8%,促进了催化剂的脱硝活性。另外,在SCR反应过程中,低浓度SO2对V/CGS催化剂脱硝具有促进作用。V/CGS catalysts are prepared by loading 1%of vanadium onto coal gasification slag(CGS)through equal volume impregnation method.The effects of calcination and pre-oxidation temperatures on the catalytic properties of the catalysts for removal of nitrogen oxides are investigated.It is found through activity evaluation that the V/CGS catalyst prepared at a calcination temperature of 500℃and a pre-oxidation temperature of 250℃shows the best catalysis properties in low-temperature denitration.Moreover,the effects of gas hourly space velocity(GHSV)and concentration of SO2 on the catalysis properties of V/CGS catalysts are also investigated.The catalysts structures are characterized by XRD,XPS,H2-TPR,and N2 adsorption/desorption analysis methods.It is verified that V element exists as V^5+in V/CGS catalysts.The pre-oxidation can improve the contents of V^5+in the catalysts by 8%and thus enhance the catalysis properties.When the catalysts are applied in NH3-SCR,a few contents of SO2 in the flue gas can promote the catalysis activity.

关 键 词：钒基催化剂 煅烧温度 预氧化温度 气化渣 低温脱硝 

分 类 号：O643[理学—物理化学]