共查询到19条相似文献,搜索用时 94 毫秒
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下列配方实例中的配方量,均为重量份。 配方实例1:锂基润滑脂 2号 3号 大港10~#车用机油 1850 2300 十二羟基硬脂酸 126 192 硬脂酸 50 48 氢氧化锂 24 39 二苯胺 3 4 配方实例2:二硫化钼锂基脂 大港10~#车用机油 1850 2300 十二羟基硬脂酸 100 180 硬脂酸 20 48 氢氧化锂 14 49 二苯胺 6 7 二硫化钼 60 70 配方实例3:钠基润滑脂 相似文献
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从润滑剂的形态来看,有气体、液体、半固体及固体之分。常用的润滑油为矿物油、合成油,属液体类,也称稀油;常用的润滑脂为半固体塑性类润滑剂,也称干油;石墨、二硫化钼等粉状类为固体润滑剂。 相似文献
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10.3润滑剂(上)
从润滑剂的形态来看,有气体、液体、半固体及固体之分.常用的润滑油为矿物油、合成油,属液体类,也称稀油;常用的润滑脂为半固体塑性类润滑剂,也称干油;石墨、二硫化钼等粉状类为固体润滑剂. 相似文献
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山东淄博电瓷厂100米隧道窑是用来烧成高压悬式电瓷,窑内高温带1300℃。全窑容纳窑车50部。过去采用二硫化钼润滑脂作为窑车轴承润滑剂,窑车高温带下部温度高达280~300℃。窑车轴承经过这样高温烘烤之后,其中二硫化钼润滑剂多半被烧焦变脆,几乎失去了润滑作用。如果每出一车都对轴承全部进行清理更新润滑剂,时间上来不及,只好注入气缸油再继续使用。这样,窑车变得十分笨重。为了改变这种状况,该厂从1978年8月开始试用一种无油高温润滑剂——石墨粉。 相似文献
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Hydrogenation of a Spanish lignite of 12% sulphur content was conducted using three molybdenum-containing catalysts impregnated into the lignite: ammonium tetrathiomolybdate, a sulphided ammonium heptamolybdate, and molybdenum disulphide. The conversions to liquids and hydrodesulphurization were investigated for a series of residence times and temperatures. At 275 °C, the ammonium salts provide no greater conversion or sulphur removal than obtained in the absence of catalyst, because these salts have not decomposed to an active catalyst at this temperature. However, lignite impregnated with molybdenum disulphide does experience greater conversion and desulphurization than lignite reacted without catalyst. At 325 °C, the lignite impregnated with the ammonium salts gives conversions and desulphurization substantially superior to that achieved with molybdenum disulphide or without catalyst. This is attributed to the superior dispersion that can be achieved by impregnation using a solution of a soluble salt rather than a slurry of the insoluble disulphide. The best conversions, liquid yield, and desulphurization are achieved using impregnated sulphided ammonium heptamolybdate. 相似文献
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《Fuel》1986,65(7):937-944
Catalytic hydrogenations using a number of bimetallic and monometallic catalysts were performed in an autoclave fitted with a falling/spinning catalyst basket. The catalysts were used as oxides with and without the addition of carbon disulphide to the autoclave charge. The products were separated by vacuum distillation and the performance of the catalysts was assessed by combining the yields from vacuum distillation with the peak area distribution of the gas chromatographs of the distillation fractions. The presence of carbon disulphide reduced the yield of material boiling below 260 °C and was particularly effective in reducing the yield of material boiling below 175 °C. Bimetallic catalysts which included molybdenum as one component generally performed better than similar bimetallic catalysts which included tungsten as one component and better than monometallic catalysts. Commercial CoMo performed well both with and without added carbon disulphide but commercial NiMo was inferior to most other catalysts when carbon disulphide was not added and to many when carbon disulphide was added. The sulphur content of the liquid products was not significantly affected by the addition of carbon disulphide to the charge. 相似文献
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M. G. B. Drew S. J. Edmondson G. A. Forsyth R. J. Hobson P. C. H. Mitchell 《Catalysis Today》1988,2(5):633-641
The interaction of isoprene with molybdenum disulphide has been studied by computer-assisted modelling of the binding of the molecule at active sites. Possible structures of intermediate-active-site complexes were evaluated by the method of molecular mechanics. For isoprene hydrogenation the preferred catalytic sites, according to energy minimisation calculations, proved to be corner molybdenum atoms having threefold unsaturation. This conclusion agrees with deductions from experimental studies of isoprene hydrogenation. The modelling studies are valuable for revealing the steric relationships between active sites and substrate molecules, for calculating the most likely structures, and for revealing non-bonded interactions. 相似文献
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《Applied catalysis》1989,46(1):113-129
The effectiveness of the activation of a commercial CoMo/Al2O3 catalyst was evaluated using five different sulphiding agents (carbon disulphide, dimethyldisulphide, butanethiol, thiophene and hydrogen sulphide) at high pressure (3 MPa) in the 300–450°C temperature range. The results indicate that the behaviour of the cobalt—molybdenum catalysts depends strongly on the nature of the activating molecule as well as the pretreatment temperature. The catalyst exhibited two different patterns, below and above 400°C. At 300°C, differences in the degree of sulphidation and in activities were observed when using different activating molecules. The most efficient of the sulphiding agents used was butanethiol while the least efficient one was thiophene. The activity of the catalyst was a maximum when carbon disulphide was used at 350°C or the other sulphiding agents at 400°C. We attributed the differences of effects of the various molecules to coupling effects between reduction and sulphidation reactions. Under the activation giving excellent activities, the coupling effect is optimal. Using carbon disulphide or thiophene at temperatures higher than 400°C, a catalyst with strongly decreased activity was produced. This behaviour is attributed to coke formation during sulphidation. 相似文献
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P.J. Kooyman E.J.M. Hensen A.M. de Jong J.W. Niemantsverdriet J.A.R. van Veen 《Catalysis Letters》2001,74(1-2):49-53
The progressive sulphidation of molybdenum-based hydrotreating model catalysts is studied using HRTEM and XPS. The catalysts are sulphided quasi in situ and prepared for TEM measurements in a glovebox. Subsequently, a specially developed vacuum-transfer specimen holder is used for transfer to the TEM. Using this procedure, a previously unknown feature is observed in the catalysts. Apart from the well-known slab-like structure of bulk molybdenum disulphide, nanometer-sized spherical entities of molybdenum sulphide or oxysulphide are observed. For a series of model CoMo/silica catalysts, these spots predominantly occur after mild sulphidation procedures. At higher sulphidation temperatures, these spots exist next to the slabs of MoS2-like material. Comparison with practical molybdenum-based hydrotreating catalysts shows that these, too, can contain spots next to or instead of slabs, depending on precursor preparation and sulphidation procedures. 相似文献
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A theoretical study is reported on the use of d.c. and r.f. plasma jets as chemical reactors for the processing of minerals in the form of a fine powder. The temperature and flow fields of the jet are calculated by solving the integral boundary layer equations. Single particles trajectories are obtained by solving the Basset-Odar equations. A multi-particle model is then developed for a feed of known particle size and injection velocity distributions under low loading conditions. Calculators are made on the thermal decomposition of molybdenum disulphide (5 to 30-micron equivalent diameter). The parameters investigated are the free jet velocity, the mean injection velocity, and the reactor ambient conditions. The results are presented as the probability density distributions of the gas loading, particle temperature, and conversion at different levels downstream of the nozzle. 相似文献
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