摘要
采用等体积浸渍法合成了不同负载量的Co O_x/HZSM-5催化剂用于苯催化氧化反应,并采用XRD、低温氮气吸附、NH_3-TPD及H_2-TPR技术对催化剂的结构、孔性质、比表面积、酸性及氧化还原性能进行表征。催化反应结果发现,HZSM-5分子筛表面分散的Co Ox颗粒显著提高了HZSM-5的苯催化氧化活性,10%Co O_x/HZSM-5催化剂表现出最优的催化活性和良好的催化稳定性。材料表征结果表明分子筛表面丰富的酸中心以及Co O_x活性组分的低温可还原性是影响Co O_x/HZSM-5催化剂催化性能的关键因素。
CoOx/HZSM-5 catalysts with varied CoOx loadings were prepared by an incipient-wetness impregnation method for the catalytic oxidation of benzene. The structure, morphology, porosity, specific surface area, acidity and redox ability of each catalyst were characterized by XRD, low-temperature N2 sorption, NH3-TPD and H2-TPR techniques. It was found that the dispersion of CoOx particles on the surface of HZSM-5 zeolite significantly improved the catalytic activity of HZSM-5 for benzene oxidation. 10% CoOx/HZSM-5 catalyst exhibited the optimum catalytic activity and good catalytic stability. Materials characterization results revealed that the abundant acidic sites on zeolite surface and the low-temperature reducibility of CoOx active species were the important factors for influencing the catalytic performance of CoOx/HZSM-5 catalyst.
作者
贾永芹
张晓晶
JIA Yongqin;ZHANG Xiaojing(College of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2018年第9期28-32,共5页
Environmental Science & Technology
关键词
CoOx
苯
催化氧化
酸性
低温可还原性
CoOx
benzene
catalytic oxidation
acidity
low-temperature reducibility
