摘要
以K_2CO_3为沉淀剂,γ—Al_2O_3为载体,采用共沉淀法制备了负载质量分数为30%和具有Co_3O_4尖晶石结构的Ni_xCo_(1-x)Co_2O_4复合金属氧化物催化剂(x分别为0、0.1、0.2、0.3、0.4、0.5、0.6、0.7、0.8、0.9和1.0),确定了最适宜的x值。考察了焙烧温度对催化剂的影响,对制备的样品进行了XRD、BET、SEM和H_2-TPR等表征,在微反装置上对催化剂进行N_2O催化分解活性评价。结果表明,适宜的x值为0.5,焙烧温度为800℃。N_2O和O_2浓度是影响催化剂的N_2O催化分解转化率的主要因素,低浓度有利于提高N_2O催化分解转化率。掺杂还原性气体(如CO和NO)加速了N_2O催化分解反应,有利于提高催化剂的N_2O催化分解转化率。在模拟工业装置反应尾气[φ(N_2O)=12%、φ(O_2)=16.8%和其他混合气体]条件下,催化剂N_2O完全催化分解温度为612℃,满足实际工业生产装置运行要求(小于750℃)。
Using K2CO3 as precipitant and γ-Al2O3 as the support, supported NixCo1-xCo204 （X- 0, 0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1. 0, respectively） complex metal oxide catalysts with spinal oxide structure were prepared by coprecipitation method with loading of 30% （ mass fraction, counted by amount of NixCol-xCo204 ）. The optimum x value was determined and the effects of calcained temperature was studied. The as-prepared samples were characterized by XRD, BET, SEM and H2-TPR. The N2O catalytic decomposition activities of the catalysts was evaluated in a microreactor. The results showed that x value of 0.5 and calcination temperature of 800 ℃ was appropriate. N2O catalytic decomposition rate of catalysts was severely decreased by enhancement of concentration of N2O and O2. Doped reducing gases （such as CO, NO） accelerated N2O catalytic decomposition reaction and increased N2O catalytic decomposition rate. N2O complete conversion temperature over Ni0.5Co0.5Co2O4/γ-Al2O3 was 612 ℃ with a simulated industry tail gas [ψ（N2O） = 12 %, ψ（ O2 ） = 16.8 % and other mixed gases ], which could satisfy the industry demand for temperature （ 〈 750 ℃ ）.
出处
《工业催化》
CAS
2010年第12期70-75,共6页
Industrial Catalysis
基金
北京市属高等学校人才强教深化计划资助项目(PHR200907129)
