共查询到20条相似文献,搜索用时 125 毫秒
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介绍了提高润滑油烟炱分散性的必要性,阐述了烟炱的形成过程以及烟炱与分散剂的相互作用机制。总结了近年来烟炱分散剂研制取得的进展:一方面对分散剂的生产工艺进行了改进,另一方面对产品的分子结构进行改进,研制出了多种新型结构的烟炱分散剂产品。 相似文献
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采用红外光谱法测定了氯乙烯-醋酸乙烯酯共聚糊树脂中醋酸乙烯酯的含量,并与热重法、化学分析法等分析方法进行了比较。指出氯乙烯-醋酸乙烯酯共聚糊树脂中醋酸乙烯酯含量的多种测定方法各有其特点,需要根据实际情况选用;红外光谱法快速、准确,可满足企业科研和生产所需。 相似文献
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红外光谱法测定烷基咪唑啉含量 总被引:1,自引:0,他引:1
本文研究了定量测定1-羟乙基-2-烷基-2-咪唑啉的方法。该法以氯仿为溶剂,用红外光谱测定样品在1600cm~(-1)处的吸光度。当样品中烷基咪唑啉的含量为2~30gL~(-1)时,其吸光度与浓度呈线性关系。方法的标准差偏为0.80~1.20%。 相似文献
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用红外光谱法测定赤霉素的含量 总被引:1,自引:0,他引:1
<正> 赤霉素(Gibberellins)又名“九二○”,是一种高效能的植物生长刺激素,对促进作物的生长和发育、提早成熟、提高产量有明显的作用。目前对赤霉素产品含量的测定使用荧光法、液相色谱法和容量滴定法进行,也已有人用红外光谱法定性研究赤霉素,但对于用红外光谱法测定赤霉素含量尚未见报 相似文献
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红外光谱法测定EVA共聚物中VA含量 总被引:3,自引:0,他引:3
本文研究了红外光谱法定量测定乙烯─醋酸乙烯酯共聚物(EVA)中醋酸乙烯酯(VA)的含量。采用比例法在同一张红外光谱图中的Vc-o-c1240cm(-1)和r(CH2)720cm(-1)二个吸收峰作为二组份的分析峰,当样品中VA含量在14~40%范围内时,方法的相对误差为-1.9~+2.7%,相对系数达0.99以上。本方法能满足对EVA含量的测定要求。 相似文献
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使用红外光谱法鉴定牌号为N402和C606两种硫化橡胶的主成分,并通过比较溶剂抽提前后和裂解前后的红外光谱和热重分析结果,得到了其中添加剂的信息.比较了裂解液透射分析法、裂解液衰减全反射(ATR)法和衰减全反射(ATR)直接法得到的红外光谱,结果表明:裂解液透射分析法和裂解液ATR法可以得到相似的红外谱图;裂解液透射分... 相似文献
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D.S. Su J.-O. Müller R.E. Jentoft D. Rothe E. Jacob R. Schlögl 《Topics in Catalysis》2004,(1):241-245
Soot particulates from an EuroIV diesel engine are sampled and investigated by high-resolution electron microscopy (HRTEM) and thermal gravimetry. The experiments reveal a drastic reduction of primary particle size down to less than 20 nm, much smaller than that emitted by earlier diesel engines. HRTEM reveals primary particles with deformed fullerenoid structures. The defective fullerenoid soot is more prone to oxidation than the soot of a black smoking diesel engine. Our findings may initiate a critical review of the current strategy for the reduction of soot emission from diesel engines. The newly developed engines reduce the quantity of soot emitted, they also emit smaller soot particles with a fullerene-like structure into the exhaust. 相似文献
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对以渣油为燃料的加热炉炉管表面积灰的现象进行探讨,对加热炉燃料的组成结构进行跟踪分析,研究炉管表面积灰形成的基理,寻求减少炉管表面积灰形成的有效途径。 相似文献
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A model catalytic converter system has been developed to investigate and characterize novel catalyst structures for filterless diesel particulate matter deposition and oxidation in modern heavy duty vehicle diesel engine exhaust systems. The particulate traps are designed for low exhaust gas back pressures and to avoid the clogging effects observed in ceramic filters. In experiments under realistic flow conditions deposition efficiencies of up to 70% have been achieved for submicrometer particles in stacks of corrugated stainless steel foil with microsphere surface coating. The model catalytic converter system is also used to study the reaction kinetics of soot oxidation and volatilization by oxygen and nitrogen oxides under a wide range of reaction conditions, for real diesel engine soot, different model soot substances, and different types of converter surfaces. 相似文献
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提出基于主元分析方法的积灰状态在线监测的数学模型,据此模型设计的由上位机、下位机、吹灰器控制柜组成的吹灰器优化控制系统,实现了吹灰时间的优化控制,且在某厂的管式加热炉上得到应用,使用效果良好。 相似文献
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超声波下用四氯化碳对泥土中油类物质进行提取,提取时间45 min,提取温度15℃,按HJ 637-2012操作先测定泥土总提取物油类含量,而后将提取液用经处置的硅酸镁吸附,脱除动植物油等极性物质后即为石油类物质,再测定其含量,动植物油的含量按总提取物与石油类含量之差结果。采用超声波提取-红外分光光度法可测定泥土中油类的含量,方法相对标准偏差为2.70%~3.88%,回收率在91%~106%之间,符合环境监测的要求。 相似文献
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Abi-Aad Edmond Cousin Renaud Pruvost Claire Courcot Dominique Noirot Rémi Rigaudeau Christine Aboukaïs Antoine 《Topics in Catalysis》2001,16(1-4):263-268
Parameters influencing the diesel soot reactivity versus the combustion reaction are studied on two diesel soot samples. The presence of cerium additives favours the reactivity of the doped soot and shifts the combustion reaction towards low temperatures. However, these additives do not affect the CO–CO2 selectivity. Oxygenated and non-oxygenated radicals adsorbed on the carbon particulate are evidenced whatever the composition of the soot sample. After a vacuum treatment, the adsorbed hydrocarbons content drastically decreases and the reactivity of both soot samples is attenuated. However, the cerium-doped sample reveals higher radical contents and also higher reactivity than the non-activated soot. The presence of cerium additives stabilises and strengthens radical–carbon interactions and these hydrocarbon radical species play an important role in the activation of the diesel soot combustion. 相似文献