共查询到20条相似文献,搜索用时 93 毫秒
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电沉积镍—钴—磷合金析氢反应电催化行为的研究 总被引:15,自引:2,他引:15
采用电沉积法制得镍钴和镍-钴-磷合金,测量了其作为阴极在1M氢氧化钾溶液中的极化曲线以研究其催化化活性。实验发现,与镍电极相比,镍钴合金镍-钴-磷合金的析氢电位正移,其中,镍-钴-磷保金析氢电位正移200多毫伏。此外,还通过扫描电镜试验和镀层成分分析从理论上探讨了磷元素对其析氢催化活性的影响。结果表明,镍-钴-磷合金具有较高的析氢催化活性,有利于降低槽压,减少能耗。 相似文献
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通过稳态极化曲线和循环伏安曲线,比较了复合氧化物涂层钛电极和镀铂钛电极的析氯和析氧电化学性能;通过循环伏安曲线,分析了复合氧化物涂层钛电极在不同溶液中的电化学性能,初步探索了复合氧化物涂层钛电极的电化学氧化机理;并将复合氧化物涂层钛电极安装在低压高频水处理装置中用于重金属废液和有机废液的电化学降解。结果表明,复合氧化物涂层钛电极相比镀铂钛电极具有更高的析氯和析氧催化活性及析氯和析氧反应效率;复合氧化物涂层钛电极在酸性溶液中析出的铜容易氧化成铜离子,出现铜返溶现象,而析出的镍不容易氧化,很难出现镍返溶现象;复合氧化物涂层钛电极具有较高的电化学催化性能,在电流密度为1 300A·m-2时,连续电解氧化120min后的铜离子去除率达到90%、镍离子去除率达到97%,连续电解氧化200min后的铵离子去除率达到98%、氰根离子去除率达到95%。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
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醋酸纤维素取代基分布与性质的关系 总被引:9,自引:0,他引:9
分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。 相似文献