摘要
室内甲醛对环境和人体有危害,其去除有重要意义.利用共沉淀法制备了Ce_(x)Zr_(1-x)O_(y)催化剂用于催化氧化去除甲醛,用XRD、SEM、N吸附-脱附、XPS表征催化剂,考察不同铈锆摩尔比的催化剂去除甲醛的活性强弱.结果表明:Ce_(0.8)Zr_(0.2)O_(y)常温催化氧化1.5 mg/m^(3)甲醛,反应前200 min内保持100%的去除率,连续反应12 h后甲醛去除率降至85%,5次焙烧再生后甲醛降解率为97%.结合物理化学表征分析发现,Ce物种的掺入能改变催化剂的形貌结构,带来更多化学吸附氧,进而提升催化剂的性能.催化剂失活原因是H_(2)O、Ce(CO_(3))_(2)占据活性位点,堵塞孔道及消耗活性组分.
Indoor formaldehyde is harmful to the environment and the human health,thus it becomes important to reduce formaldehyde.The Ce_(x)Zr_(1-x)O_(y)catalyst was prepared for formaldehyde removal by co-precipitation method and characterized by XRD,SEM,N_(2) adsorption-desorption and XPS to investigate the activity of catalytic formaldehyde with different cerium-zirconium molar ratio.The results showed that the formaldehyde with a concentration of 1.5mg/m3 could be catalytic oxidized by the Ce_(0.8)Zr_(0.2)O_(y)catalyst at room temperature,the removal rate maintained at 100%within 200 min and remained above 85%after 12 h of continuous reaction,and retained at 97%after five regeneration tests.Combined with the physicochemical characterization analysis,the Ce species can change the morphological structure of the catalyst,bring more chemical adsorbent oxygen,and then improve the performance of the catalyst.The reason for catalyst deactivation is that water and carbonate species occupy the active sites,block the pore and consume the active components.
作者
刘巷
何人广
谭小芳
贾丽娟
段开娇
高冀云
常玉
刘天成
LIU Xiang;HE Ren-guang;TAN Xiao-fang;JIA Li-juan;DUAN Kai-jiao;GAO Ji-yun;CHANG Yu;LIU Tian-cheng(College of Chemistry and Environment,Yunnan Minzu University,Technology Innovation Team of Green Purification Technology for Industrial Waste Gas,Education Department of Yunnan,Kunming 650504,Yunnan,China;Yunnan Technician College,Kunming 650500,Yunnan,China)
出处
《云南大学学报(自然科学版)》
CAS
CSCD
北大核心
2022年第5期1034-1042,共9页
Journal of Yunnan University(Natural Sciences Edition)
基金
国家自然科学基金(51568068)
云南省中青年学术和技术带头人后备人才项目(202105AC160054)。