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51.
52.
纳米级金膜微电极的制作,表征及异相催化反应 总被引:1,自引:0,他引:1
报道了纳米级金膜微电极的制作方法,用XPS及SEM对电极表面进行了表征,考察了该电极的循环伏安及计时电流特性,在聚吡咯修饰微带金电极上成功地实现了葡萄糖氧化酶和电子传递媒体Fe(CN)6^3-的同时固定,并研究了GOD/Fe(CN)6^3-/PPy微酶电极对葡萄糖的响应,稳态响应电流与葡萄糖浓度之间存在Michealis-Menten动力学特征。 相似文献
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54.
Incineration methods are becoming increasingly important from the view point of the need to minimize the environmental impact of waste tyre disposal. Combustion of waste tyre, one high ash coal and tyre-coal blends with 10, 30 and 50% waste tyre were investigated by means of thermogravimetric analysis (TGA) carried out at 20 K min−1 in the temperature range from ambient temperature to 1273 K. And effects of the mixed proportion between coal and waste tyre on the combustion process, ignition and burnout characteristics were also studied. The results indicate that the combustion of waste tyre is controlled by the emission of volatile matter, the regions are more complex for waste tyre (three or more peaks) than for coal (one peak). Also as compared with the case of burning only high ash coal, the incorporation of waste tyre can improve the combustion characteristics of high ash coal, especially the ignition performance and the peak weight loss compared with the separate burning of waste tyre and coal. Moreover, comparisons of the TG-DTG profiles between experimental and calculational results, it is indicate that there is a comparatively important difference, the co-combustion characteristics is the coupling effect between waste tyre and coal. The data resulting also showed that the co-combustion of waste tyre and low quanlitied coal as fuel is feasible. 相似文献
55.
采用从煤直接液化实验装置取得的液化残渣,研究了它的流变性及温度和油、沥青质、固体含量对其流变性的影响。液化残渣是剪切变稀的非牛顿型假塑性流体,非牛顿指数随温度升高而不断减小,温度越高越接近牛顿流体行为。液化残渣对温度非常敏感,在升温过程中其表观黏度下降很快,且没有出现黏度峰。在液化残渣中加入少量的循环油后其表观黏度大幅下降;而在加入少量沥青质后则表现出低温下黏度变大,高温下黏度变小的现象;固体含量则始终是黏度增大的因素,表明其黏度与油、沥青质和固体含量关系密切。液化残渣的黏度-温度关系符合Arrhenius关系式,但在升温过程中出现了拐点,低温段的黏流活化能比高温段的要大。 相似文献
56.
Simplistic modeling approach to heterogeneous dilute-acid hydrolysis of cellulose microcrystallites 总被引:9,自引:0,他引:9
Pär O. Pettersson Robert W. Torget Robert Eklund Qian Xiang Y. Y. Lee Guido Zacchi 《Applied biochemistry and biotechnology》2003,106(1-3):451-455
The classic kinetic model for cellulose hydrolysis is often referred to as pseudo-homogeneous, a term revealing the insight that the process is actually heterogeneous. During the past 10–15 yr, the shortcomings of this
model have been demonstrated in various studies and the interest in the heterogeneous aspects has increased. The present work
presents a simplistic model in which the intrinsic, heterogeneous hydrolysis and transport rates are coupled by the assumption
of a constant glucosidic surface concentration. The mechanisms affecting these two rates are largely unknown, but the model
serves as a guideline for further exploration of the process. 相似文献
57.
CFB煤燃烧/热解双反应器中热解室对立管内气固流动特性的影响 总被引:4,自引:0,他引:4
考察了循环流化床煤燃烧/热解双反应器系统中热解室的存在对立管内的压力分布及气固流动状况的影响。提升管的内径100 mm、高6 m,立管的内径44 mm、高3 m,热解室的截面积200 mm×200 mm、高770 mm。结果表明,随着提升管内表观气速Ur的增加,有无热解室立管内均为负压差流动,负压差梯度随着Ur的增加而减小。有热解室时,热解室内要保持一定的料位高度,整个立管内固体颗粒的流动为负压差移动床流动;没有热解室时,立管内为稀相流动和移动床流动同时存在,立管内平衡料柱高度随Ur的增加而升高。随着循环量Gs的增加,两种类型的立管内负压差梯度均随之增大,也存在着流动形态的差别。循环量Gs的增加会引起立管内平衡料柱高度的降低。立管内气固相对滑移速度也随着循环量Gs的增加而增大。 相似文献
58.
Subash C. Raghu Sheela Berchmans Dr. Kanala L. Phani Dr. Venkatraman Yegnaraman Dr. 《化学:亚洲杂志》2007,2(6):775-781
This paper describes the formation of catalytically active thin films of Pt, Pt/Au, and Pt/Ru on gold substrates stabilized by amine‐terminated polyamidoamine (PAMAM) dendrimers. A monolayer of dendrimer is initially self‐assembled on the gold substrate, which serves as a template for the growth of catalytically active thin films. As dendrimers contain tens to hundreds of functional groups at the periphery, the aggregate strength of the multidentate interactions with the gold substrate leads to the formation of robust films. The films were found to exhibit high catalytic activity for the oxidation of small hydrocarbons such as methanol. Such films offer versatility and scope for the design of effective electrocatalysts, especially in the context of microfuel cells and “dendrichips”; hence, they could find applications in the fields of sensors, fuel cells, and waste‐water treatment. 相似文献
59.
99Mo1、31I和89Sr等医用同位素对人类健康和医学的发展具有非常重要的作用。与靶辐照反应堆相比,用水溶液堆生产99Mo1、31I和89Sr具有安全性好,结构简单,经济价值高,无靶件制备、溶解工艺,产生废物少等优点,用水溶液堆生产医用同位素具有很好的发展前景。由于多堆芯水溶液堆、高功率水溶液堆均能显著提高产率,低富集度235U水溶液堆符合核不扩散条约中对235U浓缩度的要求,因此这三种堆是水溶液堆未来的发展方向。 相似文献
60.
Pyrolysis and TG Analysis of Shivee Ovoo Coal from Mongolia 总被引:2,自引:0,他引:2
B. Avid B. Purevsuren M. Born J. Dugarjav Ya. Davaajav A. Tuvshinjargal 《Journal of Thermal Analysis and Calorimetry》2002,68(3):877-885
The coal sample of the Shivee Ovoo deposits has been non-isothermally pyrolysed in a thermogravimetric analyser to determine
the influence of temperature, heating rate and purge gas employed on the thermal degradation of the sample. The heating rates
investigated in the TG were 10–50 K min–1 to final temperature of 1000°C. N2or CO2 were employed as well as type of purge gas on the process of thermal degradation of the coal sample. The coal was also investigated
in a fixed bed reactor to determine the influence of temperature and heating rate of the pyrolysis on the yield of products
and composition of the gases evolved. The main gases produced were H2, CH4, C2H2, C2H4, C2H6, C3H6 and C3H8 and also minor concentrations of other gases.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献