摘要
采用固相法制备了一系列CuCeO_(x)复合金属氧化物催化剂,研究了铜铈比(1:2、1:1、2:1,摩尔比,下同)和煅烧温度(400、600、800℃)对CO催化氧化性能的影响。利用自制催化剂测试装置对9种催化剂的催化性能进行评价。针对催化性能最佳的催化剂CuCe2-600,进一步测试了其抗水性和稳定性。结果表明,在煅烧温度为200℃、水汽体积分数为12.0%的条件下,经过72 h稳定性测试,CuCe2-600催化剂转化率仍能保持在90%左右。此外,对CuCe2-400、CuCe2-600、CuCe2-800、CuCe1-600和CuCe0.5-600催化剂进行了扫描电子显微镜(SEM)、X射线衍射仪(XRD)和X射线光电子能谱仪(XPS)表征,解析了铜铈比和煅烧温度对催化剂结构及性能的影响。结果表明,当铜铈比为2:1、煅烧温度为600℃时,催化剂表面具有最多的Cu^(+)、Ce^(3+)和吸附氧,有利于CO吸附和氧化。当煅烧温度为800℃时,CuCe2-800催化剂受晶体生长和烧结团聚现象的影响,铜铈之间的相互作用减弱,不利于对CO催化氧化反应。
A series of CuCeO_(x) composite metal oxide catalysts were synthesized using the solid-phase method to investigate the effects of varying Cu/Ce molar ratios(1∶2,1∶1 and 2∶1)and calcination temperatures(400,600 and 800℃)on CO catalytic oxidation.The catalytic performance of nine catalysts was evaluated using a custom-built catalyst testing apparatus.Among them,the CuCe2-600 catalyst exhibited the best performance,with further tests revealing its excellent water resistance and stability.The results showed that the conversion of the CuCe2-600 catalyst still maintain about 90%after 72 h stability test under the conditions of calcination temperature of 200℃and water vapor volume fraction of 12.0%.In addition,the CuCe2-400,CuCe2-600,CuCe2-800,CuCe1-600 and CuCe0.5-600 catalysts were characterized by scanning electron microscopy(SEM),X-ray diffractometry(XRD),and X-ray photoelectron spectroscopy(XPS),and the effects of the Cu/Ce molar ratio and the calcination temperature on the structure and performance of the catalysts were resolved.The analysis demonstrated that a Cu/Ce molar ratio of 2∶1 and a calcination temperature of 600℃result in the highest concentrations of Cu^(+),Ce^(3+)and adsorbed oxygen on the catalyst surface,which promote CO adsorption and oxidation.When the calcination temperature is 800℃,the CuCe2-800 catalyst is affected by crystal growth and sintering agglomeration phenomena,and the interaction between copper and cerium weakens,which is not conducive to its catalytic performance for CO oxidation reaction.
作者
韩美丹
王延江
佘雪峰
李晓海
葛志彬
田欢欢
薛庆国
HAN Meidan;WANG Yanjiang;SHE Xuefeng;LI Xiaohai;GE Zhibin;TIAN Huanhuan;XUE Qingguo(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China;Delong Iron and Steel Company Limited Sintering Plant,Xingtai 054009,China;Hebei Hot Rolled Plate and Strip Steel Technology Innovation Center,Xingtai 054009,China)
出处
《江西冶金》
2025年第1期74-82,共9页
Jiangxi Metallurgy
基金
国家自然科学基金项目(U1960205)
邢台市重点研发项目(2022zz056)。
