Co/Hβ催化剂上 N2O 的分解性能研究

摘要

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N2 O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Co3 O4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,N2 O 分解温度低,t10、t50和t95分别为325~329℃、364~367℃和406~408℃。%The catalyst of cobalt oxide supported on Hβ zeolite (Co / Hβ) was prepared by impregnation methodand characterized by XRD loading on the catalytic performance of Co / Hβ in N , H2-TPR, NH3-TPD, and SEM. The effects of calcination temperature and cobalt 2 O decomposition were investigated. The results showed that cobalt species are present mainly in the form of Co 3 O 4 spinel oxide. The acidity, acid amount and redox property of the Co / Hβ catalyst were significantly affected by the calcination temperature; the Co-Al-O species that isdifficult to reduce by hydrogen is formed at a calcination temperature over 700 ℃. The catalytic activity of the Co / Hβ catalyst was affected by the calcintion temperature and cobalt loading. The Co / Hβ catalyst calcined at 600 ℃ and with a cobalt loading of 10% ~ 15% exhibits excellent catalytic activity in N2 O decomposition; thetemperatures t respectively. 10 , t50 and t95 for N2 O decomposition are 325 ~ 329 ℃, 364 ~ 367 ℃, and 406 ~ 408 ℃,respectively.