利用两阶段还原法对W Ni Fe复合氧化物粉末进行还原,控制还原工艺的参数制得纳米级W Ni Fe复合粉末。采用XRD对粉末进行物相分析,并计算晶粒尺寸;采用高倍SEM观察粉末形貌;对复合粉末的费氏粒度、比表面面积、氧含量等进行测定与分析,...利用两阶段还原法对W Ni Fe复合氧化物粉末进行还原,控制还原工艺的参数制得纳米级W Ni Fe复合粉末。采用XRD对粉末进行物相分析,并计算晶粒尺寸;采用高倍SEM观察粉末形貌;对复合粉末的费氏粒度、比表面面积、氧含量等进行测定与分析,研究还原温度和还原时间对粉末性能的影响。研究结果表明:当还原温度高于600℃时制得的复合粉末由W和(Ni,Fe)两相组成;粉末颗粒呈球形或近球形;还原温度和还原时间都对W Ni Fe复合粉末的性能有显著影响,当还原温度为700℃,还原时间为90min时,制备的颗粒为平均费氏粒度低于0.65μm,平均BET粒度小于100nm,晶粒粒径小于30nm,粉末氧含量小于0.23%的纳米级W Ni Fe复合粉末。展开更多
Mixed oxide catalyst Cs 0 1 Fe 2Co 6BiMnMo 12 O x was prepared by the interprecipitation method,then the catalyst was calcined at different temperature.Selective oxidation of isobutene was carried out in a fixed bed r...Mixed oxide catalyst Cs 0 1 Fe 2Co 6BiMnMo 12 O x was prepared by the interprecipitation method,then the catalyst was calcined at different temperature.Selective oxidation of isobutene was carried out in a fixed bed reactor.The results showed that the catalyst has high catalytic activity.Under the optimum reaction conditions (n( C = 4)∶n(O 2)=1∶2 1∶4,space velocity=180h 1 ,T=360℃),the yield of methacrolein and methacrylic reached 80%,8%,respectively.The total yields of liquid products(methacrolein,methacrylic acid and acetic acid)reached about 90%.展开更多
文摘利用两阶段还原法对W Ni Fe复合氧化物粉末进行还原,控制还原工艺的参数制得纳米级W Ni Fe复合粉末。采用XRD对粉末进行物相分析,并计算晶粒尺寸;采用高倍SEM观察粉末形貌;对复合粉末的费氏粒度、比表面面积、氧含量等进行测定与分析,研究还原温度和还原时间对粉末性能的影响。研究结果表明:当还原温度高于600℃时制得的复合粉末由W和(Ni,Fe)两相组成;粉末颗粒呈球形或近球形;还原温度和还原时间都对W Ni Fe复合粉末的性能有显著影响,当还原温度为700℃,还原时间为90min时,制备的颗粒为平均费氏粒度低于0.65μm,平均BET粒度小于100nm,晶粒粒径小于30nm,粉末氧含量小于0.23%的纳米级W Ni Fe复合粉末。
文摘Mixed oxide catalyst Cs 0 1 Fe 2Co 6BiMnMo 12 O x was prepared by the interprecipitation method,then the catalyst was calcined at different temperature.Selective oxidation of isobutene was carried out in a fixed bed reactor.The results showed that the catalyst has high catalytic activity.Under the optimum reaction conditions (n( C = 4)∶n(O 2)=1∶2 1∶4,space velocity=180h 1 ,T=360℃),the yield of methacrolein and methacrylic reached 80%,8%,respectively.The total yields of liquid products(methacrolein,methacrylic acid and acetic acid)reached about 90%.
