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
目的通过等离子喷涂工艺,在油气管道X70管线钢表面制备出Cr2O3/TiO2高温氧化物陶瓷复合涂层,研究该涂层的微观组织与电化学性能。方法采用9MC Plasma Control Unit等离子喷涂系统,基于线切割尺寸为40mm×24mm×6mm的X70管线钢...目的通过等离子喷涂工艺,在油气管道X70管线钢表面制备出Cr2O3/TiO2高温氧化物陶瓷复合涂层,研究该涂层的微观组织与电化学性能。方法采用9MC Plasma Control Unit等离子喷涂系统,基于线切割尺寸为40mm×24mm×6mm的X70管线钢基体表面,沉积Cr2O3/TiO2高温氧化物陶瓷复合涂层。利用金相显微镜和扫描电子显微镜观察该复合涂层的微观组织与形貌,利用X射线衍射仪分析该复合涂层的物相组成,利用电化学工作站测定该复合涂层的电化学腐蚀性能。结果Cr2O3/TiO2高温氧化物陶瓷复合涂层由完全熔化区和半熔化区双态组成,呈典型的等离子喷涂层状结构,层与层之间结合较紧密,分布着富Cr2O3沉积区与富TiO2沉积区,无相变产生,完全熔融的TiO2液相可嵌入到未完全熔融的Cr2O3结构间隙中形成固溶结构。经电化学腐蚀性能测试,其自腐蚀电位介于-0.4^-0.3V之间,高于X70管线钢基体的自腐蚀电位-0.6^-0.5V,腐蚀倾向滞后,表现出好的抗腐蚀性能。结论研究选取的等离子喷涂参数较合适,并成功制备出了能明显提高油气管道X70管线钢抗电化学腐蚀性且组织分布均匀的Cr2O3/TiO2高温氧化物陶瓷复合涂层。展开更多
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%.
文摘目的通过等离子喷涂工艺,在油气管道X70管线钢表面制备出Cr2O3/TiO2高温氧化物陶瓷复合涂层,研究该涂层的微观组织与电化学性能。方法采用9MC Plasma Control Unit等离子喷涂系统,基于线切割尺寸为40mm×24mm×6mm的X70管线钢基体表面,沉积Cr2O3/TiO2高温氧化物陶瓷复合涂层。利用金相显微镜和扫描电子显微镜观察该复合涂层的微观组织与形貌,利用X射线衍射仪分析该复合涂层的物相组成,利用电化学工作站测定该复合涂层的电化学腐蚀性能。结果Cr2O3/TiO2高温氧化物陶瓷复合涂层由完全熔化区和半熔化区双态组成,呈典型的等离子喷涂层状结构,层与层之间结合较紧密,分布着富Cr2O3沉积区与富TiO2沉积区,无相变产生,完全熔融的TiO2液相可嵌入到未完全熔融的Cr2O3结构间隙中形成固溶结构。经电化学腐蚀性能测试,其自腐蚀电位介于-0.4^-0.3V之间,高于X70管线钢基体的自腐蚀电位-0.6^-0.5V,腐蚀倾向滞后,表现出好的抗腐蚀性能。结论研究选取的等离子喷涂参数较合适,并成功制备出了能明显提高油气管道X70管线钢抗电化学腐蚀性且组织分布均匀的Cr2O3/TiO2高温氧化物陶瓷复合涂层。
