摘要
采用柠檬酸络合燃烧法制备La_(0.90)A_(0.10)CoO_(3)(A=Mg,Ca,Sr,Ba)催化剂,用XRD、FT-IR、SEM、BET、H2-TPR和NO-TPD等手段对La_(0.90)A_(0.10)CoO_(3)催化剂的理化性质进行表征,在固定床反应器中评价了催化剂CO-SCR脱硝活性。结果表明:采用柠檬酸络合燃烧法制备的La_(0.90)A_(0.10)CoO_(3)催化剂具有钙钛矿结构,无杂相生成(La_(0.90)Mg_(0.1)0-CoO_(3)除外);与LaCoO_(3)催化剂相比,Ba^(2+)部分取代La^(3+)后,生成的La_(0.90)Ba_(0.1)0CoO_(3)催化剂粒径小且比表面积大,有良好的分散性和氧化还原性,对NO有适宜的吸脱附性能,CO-SCR脱硝性能好,在反应温度为360℃时,NO转化率为68.7%,其他碱土金属部分取代La^(3+)后,催化活性变差。
La_(0.90)A_(0.10)CoO_(3)(A=Mg,Ca,Sr,Ba)catalyst was prepared by citric acid complexation combustion method.The physicochemical properties of La_(0.90)A_(0.10)CoO_(3)catalyst were characterized by XRD,FT-IR,SEM,BET,H2-TPR and NO-TPD.CO-SCR denitrification activity of the catalyst was evaluated in a fixed-bed reactor.The results show that La_(0.90)A_(0.10)CoO_(3)catalyst prepared by citric acid complexation combustion has a perovskite structure and no heterogeneous generation(except La_(0.90)Mg_(0.1)0CoO_(3)).Compared with LaCoO_(3)catalyst,La_(0.90)Ba_(0.1)0CoO_(3)catalyst which is partially La^(3+)substituted by Ba^(2+),has small particle size and the large specific surface area,good dispersibility and redox performance,suitable absorption and desorption performance for NO,and good catalytic CO-SCR denitrification performance.At reaction temperature 360℃,NO conversion rate can reach 68.7%.The catalytic activity become poor after other alkaline earth metals partially replacing La^(3+).
作者
赵田田
齐瑞杰
王莹
洪嘉奇
刘晓刚
赵明新
王虹
ZHAO Tian-tian;QI Rui-jie;WANG Ying;HONG Jia-qi;LIU Xiao-gang;ZHAO Ming-xin;WANG Hong(College of New Materials and Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China;Beijing Key Laboratory of Fuels Cleaning and Efficient Catalytic Emission Reduction Technology,Beijing 102617,China)
出处
《化学工程》
CAS
CSCD
北大核心
2023年第1期17-20,25,共5页
Chemical Engineering(China)
基金
国家自然科学基金资助项目(U1662103,2167329)
北京市大学生创新创业训练计划(2022J00230)。
关键词
钴基钙钛矿
一氧化碳
氮氧化物
碱土金属
cobalt-based perovskites
carbon monoxide
nitrogen oxides
alkaline earth metals
