目前正在欧洲核子中心(CERN)建造的LHC(L arge H adron Co llider)是世界上最大的加速器,它是一个具有高能量(7 T eV)大流强(0.53 A)的质子加速器。在它的直线节真空系统中,绝大部分的真空盒内表面将被镀上NEG薄膜。这样在又细又长的真...目前正在欧洲核子中心(CERN)建造的LHC(L arge H adron Co llider)是世界上最大的加速器,它是一个具有高能量(7 T eV)大流强(0.53 A)的质子加速器。在它的直线节真空系统中,绝大部分的真空盒内表面将被镀上NEG薄膜。这样在又细又长的真空盒里,当有束流通过时,NEG薄膜不仅可以作为分布式吸气剂泵使用,而且NEG薄膜还具有降低二次电子发射系数的作用,因此了解NEG薄膜的性能是很重要的。展开更多
Methane decomposition reaction has been studied at three different activation temperatures(500°C,800°C and950°C)over mesoporous alumina supported Ni–Fe and Mn–Fe based bimetallic catalysts.On co-impre...Methane decomposition reaction has been studied at three different activation temperatures(500°C,800°C and950°C)over mesoporous alumina supported Ni–Fe and Mn–Fe based bimetallic catalysts.On co-impregnation of Ni on Fe/Al_2O_3the activity of the catalyst was retained even at the high activation temperature at 950°C and up to180 min.The Ni promotion enhanced the reducibility of Fe/Al_2O_3oxides showing higher catalytic activity with a hydrogen yield of 69%.The reactivity of bimetallic Mn and Fe over Al_2O_3catalyst decreased at 800°C and 950°C activation temperatures.Regeneration studies revealed that the catalyst could be effectively recycled up to 9times.The addition of O_2(1 ml,2 ml,4 ml)in the feed enhanced substantially CH_4conversion,the yield of hydrogen and the stability of the catalyst.展开更多
文摘目前正在欧洲核子中心(CERN)建造的LHC(L arge H adron Co llider)是世界上最大的加速器,它是一个具有高能量(7 T eV)大流强(0.53 A)的质子加速器。在它的直线节真空系统中,绝大部分的真空盒内表面将被镀上NEG薄膜。这样在又细又长的真空盒里,当有束流通过时,NEG薄膜不仅可以作为分布式吸气剂泵使用,而且NEG薄膜还具有降低二次电子发射系数的作用,因此了解NEG薄膜的性能是很重要的。
基金the Deanship of Scientific Research at King Saud University for its funding this research group No.(RG-1436-119)
文摘Methane decomposition reaction has been studied at three different activation temperatures(500°C,800°C and950°C)over mesoporous alumina supported Ni–Fe and Mn–Fe based bimetallic catalysts.On co-impregnation of Ni on Fe/Al_2O_3the activity of the catalyst was retained even at the high activation temperature at 950°C and up to180 min.The Ni promotion enhanced the reducibility of Fe/Al_2O_3oxides showing higher catalytic activity with a hydrogen yield of 69%.The reactivity of bimetallic Mn and Fe over Al_2O_3catalyst decreased at 800°C and 950°C activation temperatures.Regeneration studies revealed that the catalyst could be effectively recycled up to 9times.The addition of O_2(1 ml,2 ml,4 ml)in the feed enhanced substantially CH_4conversion,the yield of hydrogen and the stability of the catalyst.
