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采用浸渍法制备了Hβ分子筛负载钴氧化物催化剂。考察了催化剂焙烧温度和钴负载量对催化剂催化分解N2O活性的影响,并采用XRD、NH3-TPD、H2-TPR、SEM等手段对催化剂的理化性质进行表征。结果表明,催化剂中的钴物种主要以Co3O4尖晶石型形态存在;催化剂焙烧温度显著影响其酸性和酸量及氧化还原性能,焙烧温度达到700℃后,催化剂中有难还原的Co-Al-O物种生成。焙烧温度和钴负载量对催化剂的催化活性均有影响,焙烧温度为600℃、钴负载量为10%~15%的催化剂催化活性好,N2O分解温度低,t10、t50和t95分别为325~329℃、364~367℃和406~408℃。
Hβ molecular sieve supported cobalt oxide catalysts were prepared by impregnation method. The effect of catalyst calcination temperature and cobalt loading on the catalytic activity of N2O was investigated. The physical and chemical properties of the catalyst were characterized by XRD, NH3-TPD, H2-TPR and SEM. The results showed that the cobalt species in the catalyst mainly existed in the form of Co3O4 spinel. The calcination temperature significantly affected the acidity, acidity and redox properties. After the calcination temperature reached 700 ℃, the Co-Al- O species generation. The calcination temperature and cobalt loading all have influence on the catalytic activity. The calcination temperature is 600 ℃, the catalytic activity of cobalt loading 10% ~ 15% is good, the decomposition temperature of N2O is low, t10, t50 and t95 are 325 ~ 329 ° C, 364 ° C to 367 ° C and 406 ° C to 408 ° C.