美国上周零售柴油价格下跌4.6美分至4.718美元_能源资讯_新浪财经_新浪网
美国上周零售柴油价格下跌4.6美分至4.718美元
　　文华财经（综合编译 明丽娜）--据纽约7月21日消息，美国能源资料协会（EIA）周一称，最近一周美国全国零售柴油平均售价下降4.6美分，至每加仑4.718美元。
　　目前的售价较去年同期高1.829美元，所有地区柴油平均售价均下跌。
　　数据显示，洛矶山柴油价格跌幅最小，为0.4美分，至每加仑4.714美元。西海岸柴油价格仍为全美地区最高，为每加仑4.845美元。加利福尼亚州柴油平均售价本周下滑至5.00美元下方。
　　以下为EIA公布的零售柴油平均售价详细情况：
较上一周变化
价格（美元/加仑）
　　东海岸
　　中西部
　　墨西哥湾沿岸
　　洛矶山
　　西海岸
　　加利福尼亚
电话：010-
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, 22 March 2010, Pages 146–152
Design of supported cobalt catalysts with maximum activity for the Fischer&Tropsch synthesis, , , , ,
Inorganic Chemistry and Catalysis, Debye Institute for NanoMaterials Science, Utrecht University, NL-3584 CA Utrecht, The NetherlandsThe role of the cobalt particle size distribution in the Fischer&Tropsch (FT) reaction for supported Co catalysts was investigated. Using TEM histogram analyses and activity measurements of carbon nanofiber-supported catalysts, the TOF of discrete Co particle sizes was calculated. It was found that cobalt particles of 4.7 & 0.2 nm are the most active in the FT reaction (1 bar, 220 &C), and a narrow Co particle size distribution is clearly essential to arrive at the maximum activity. We have approached this requirement for maximum FT activity with an 18 wt.% Co/SiO2 catalyst prepared via impregnation, drying and calcination in NO/He. The more narrow Co particle size distribution (4.6 & 0.8 nm) in Co/SiO2 led to an activity enhancement of &40% compared to Co/CNF (5.7 & 1.4 nm), although some promoting effect of silica could not be excluded.From TEM histograms and Fischer&Tropsch activities of Co/CNF catalysts, an optimum cobalt size with maximum activity was deduced. Based on this knowledge, a highly active Co/SiO2 catalyst with a narrow size distribution was synthesized.KeywordsFischer&Tropsch synthesis; Cobalt catalysts; Particle size distribution; Cobalt on silica; NO calcination
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