排序方式: 共有13条查询结果,搜索用时 15 毫秒
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高速工具钢中铬的测定,直接用磷酸(1+1)溶解,冒硫酸烟30s,加高氯酸氧化Cr~(3+)使分析更为快速、准确.同时发现冒硫酸烟时间(冒至瓶底清亮需1.30~2min)与高氯酸量存在着一定关系,如冒烟30s,只需加入4ml高氯酸,而冒烟1~2mim则需5ml以上才能将Cr~(3+)氧化完全,否则结果约低2%. 相似文献
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CARBON DEPOSITION AND CATALYST DEACTIVATION OF Sb-Fe OXIDE CATALYST IN THE AMMOXIDATION OF PROPYLENE
Carbon deposition and catalyst deactivation of Sb-Fe oxide catalyst in the ammoxidation of propylenewere investigated by means of a fluidized-bed reactor.The reactivity,surface acidity,specific surfacearea,average pore radius,and electron spin resonance spectrum data were obtained from the catalysts ofincreasing carbon deposition.Chemisorption of oxygen and propylene and thermal programmed desorptionof propylene were carried out on the Sb-Fe oxide catalyst as well as a commercial one,Mo-Bi.Isotopicexperiment using acrylonitrile-2-~(14)C as tracer was also accomplished.It was found that carbon deposition due to intermediates and acrylonitrile on selective oxidation sitescould be the primary reason for catalyst deactivation,and that because of the Sb-Fe oxide catalytspossessing a property of easy reduction and difficult reoxidation,the structure of the FeSbO_4 would bedecomposed under the oxygen-lean condition into Sb_2O_3 and Fe_2O_3 which form the deep oxidation catalystcomponent.According to the above investigation a suggestion for improving catalyst properties has been proposed. 相似文献
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大同侏罗纪10-11#煤中微量元素分布赋存特征 总被引:1,自引:2,他引:1
讨论了大同 1 0 - 1 1 #煤中 36种微量元素的含量分布 ,通过浮沉试验及煤岩组分定量统计 ,运用 Salori方法 ,计算了 1 4种有害微量元素在大同煤不同煤岩组分中的分布 ,进而分析了其赋存状态及其在煤炭洗选过程中的脱除潜力 .结果表明 ,大同煤中大部分微量元素含量较低 ,但As,Hg,Cr,Sb等元素的有机组分含量偏高 ;大部分微量元素主要分布于矿物中 ,而 B,Be,Cd,Co,Ni和 Sb等有害元素含量偏高 ;同时 ,相对而言 ,As,B,Ba,Cd,Co,Cr,Mn和 Ni等元素在镜质组中含量较高 ,而 Be,Li,Pb和 Sb等元素在丝质组中含量较高 .浮沉试验表明 ,微量元素在煤炭洗选过程中的迁移、脱除行为主要受其赋存特征影响 相似文献
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中子寿命求剩余油饱和度影响因素探讨 总被引:2,自引:0,他引:2
中子寿命测井在高矿化度地层中监测剩余油饱和度变化和寻找高剩余油、高含水油层等方面具有很好的效果,但作为定量评价其准确度受到泥质含量、岩石骨架的俘获截面值、孔晾度等不确定因素的影响。因此要利用中子寿命测井求剩余油饱和度就必须要对各种影响因素进行校正。本文针对轮南油田2井区已有中子寿命测井资料,对影响中子寿命测井的各种因素进行研究分析,通过图版法进行校正,并与实际资料进行对比,从而得出更为精确的剩余油饱和度。 相似文献