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high specific surface area     
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  高比表面积
     Magnetic Fe_3O_4 Nanopowder with High Specific Surface Area Prepared by Inverse Phase Method
     转相法制备高比表面积纳米Fe_3O_4磁性粉体
短句来源
     A Study On Preparation of High Specific Surface Area Manganous Manganic Oxide(Mn_3O_4)
     高比表面积Mn_3O_4制备研究
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     Studies on Preparation of SiO_2 with High Specific Surface Area by Wollastonite and Hydrochloric Acid
     硅灰石与酸反应制备高比表面积SiO_2的实验研究
短句来源
     method of supercritical fluid drying ispresented, by which many kinds of oxideswith large pore volume and high specific surface area, such as SiO2, Al2O3, ZrO2, TiO2,MgO, or mixtures of these oxides, can be prepared.
     介绍了利用超临界流体干燥法制备高比表面积的大孔一元氧化物,如SiO2、Al2O3、ZrO2、TiO2和MgO等,还可制得均匀的二元、三元及多元氧化物。
短句来源
     ACC with high specific surface area results in the highest activity of Pt/ACC catalyst.
     ACC的高比表面积使Pt/ACC催化剂的活性最高。
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  高比表面
     Preparation and Characterization of High Specific Surface Area Ce_xZr_(1-x)O_2 Mixed Oxide
     高比表面Ce_xZr_(1-x)O_2复合氧化物的制备及表征
短句来源
     Synthesis and Characterization of Titania-pillared Layered HLaNb_2O_7 with High Specific Surface Area
     高比表面TiO_2柱层状HLaNb_2O_7的制备和表征
短句来源
     TiO_2 Photocatalyst with High Specific Surface Area: Preparation and Hydrogen Evolution Performance
     高比表面TiO_2光催化剂的制备及产氢性能研究
短句来源
     Ni was dispersed on γ-Al2O3 with large pore volume and high specific surface area by using wet impregnation method.
     制备了负载于大孔容、高比表面的γ-Al2O3载体上的Ni基催化剂.
短句来源
     Hydrothermal refluxing method was first applied to prepare high specific surface area CeO_2-ZrO_2 mixed oxides.
     (2)首次采用水热回流法制备了高比表面CeO_2-ZrO_2复合氧化物。
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  高的比表面积
     The strength of popular cement at 3d and 28d be equivalent to high C3S cement only when it had high specific surface area, but its drying shrinkages was more than that of high C3S cement at the same curing and drying condition.
     普通水泥只有在很高的比表面积时,3d和28d强度才和高C3S水泥相当,但其干缩比高C3S水泥大得多。
短句来源
     Nano ZrO_2 has high specific surface area and its surface defects is rich, but nano ZrO_2 particles are prone to agglomerate and reduce the specific surface area under high temperature.
     纳米ZrO_2具有高的比表面积和丰富的表面缺陷,但高温下纳米ZrO_2容易团聚导致表面积减小。
短句来源
     Especially, the mesoporous silica materials (designated MCM-41), which is regarded as a novel nano-structured materials, are expected to show potential values in many fields such as adsorption, catalysis, optics, nano-technology, electronics, magnetics and chemical sensors because they exhibit hexagonal structure, the pore size which can be regulated from 1.5 to 10nm, high specific surface area and thermal stability.
     特别是以命名为MCM-41的有序介孔材料的出现,因其孔道呈六方有序排列、孔径在1.5~10nm范围内可连续调节、高的比表面积和热稳定性等特点而在吸附、催化、分离、纳米技术以及光、电、磁等领域具有广泛的应用价值,正成为众多领域的研究热点之一。
短句来源
     One key to a good biofilm technology is having an appropriately high specific surface area.
     对于一个好的生物膜技术,其关键就是有一个适当高的比表面积.
短句来源
     The high specific surface area, high catalytic activity, special physical and chemical properties, super minuteness of the nanomaterials made them very promising materials of chemically modified electrodes.
     纳米粒子的高的比表面积、高的催化活性、特殊的理化性质及超微小性等特征,使其成为化学修饰电极中的新兴材料。
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  “high specific surface area”译为未确定词的双语例句
     Both fresh and aged Co3O4/ YSZ-Al2O3 and Co3O4/ YSZ-Al2O3+OSM remain high specific surface area .
     用YSZ-Al2O3和YSZ-Al2O3+OSM为载体的8wt.%Co3O4甲烷燃烧催化剂,老化后保持较大的比表面,分别为112.3m2/g和100.2m2/g,;
短句来源
     The results show a high specific surface area of 116.8 m~(2)/g and total pore volume of 0.30 cm~(3)/g after calcining at 873 K for 4 h,and after aging at 1 273 K for 10 h,the specific surface area and total pore volume of 68.1 m~(2)/g and 0.22 cm~(3)/g were maintained.
     结果表明,该材料经873 K焙烧4 h后比表面积达到116.8 m2/g,孔容达到0.30 cm3/g,经1 273 K老化10 h后,比表面积和孔容仍然保持在68.1 m2/g和0.22 cm3/g.
短句来源
     Nanoscale particles possessed rather high specific surface area and surface reactivity and that the specific surface area of the prepared nanoscale Pd/Fe bimetal BET reached 12.4m2/g, while the commercially available Fe particle (<10m) had only the specific surface area 0.49m2/g.
     结果表明,纳米颗粒具有较高的比表面积和表面反应活性,所制备的纳米Pd/Fe双金属BET比表面积达到12.4m2/g,而商用铁颗粒(<10m)的比表面积只有0.49m2/g;
短句来源
     SYNTHESIS CONDITIONS OF CATALYST γ-Mo_2N WITH HIGH SPECIFIC SURFACE AREA
     大比表面积γ-Mo_2N催化剂合成条件的考察
短句来源
     Mesoporous TiO2 nanocrystals with anatase phase and high specific surface area was synthesized by sol-gel process using nonionic surfactant EO20PO70EO20 as a structure-directing agent,C16H36Ti as Ti precursor,La2O3 as catalyst support and ethanol as an extraction agent.
     采用非离子型表面活性剂EO20PO70EO20(P123)为模板剂,钛酸丁酯为钛源,La2O3为促进剂,无水乙醇为萃取剂,使用溶胶-凝胶法合成了具有锐钛矿相介孔结构和高比表面积的纳米TiO2。
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  high specific surface area
On the other hand, the HCl-treated sample has very low ion-exchange capacities for all metal ions even though it has high specific surface area and total pore volume.
      
High specific surface area, high dispersion of manganese oxide species and strong interaction of manganese oxide species with γ-Al2O3 are of benefit to the reaction.
      
This sample has high specific surface area and a large volume of mesopores.
      
It has been found also that an initial S/Zr molar ratio equal to 0.5 allowed to obtain an optimal sulfur content and a high specific surface area.
      
The adsorption of a cysteine enzyme, on mesoporous silica with high specific surface area synthesized by the sol-gel method, was studied in a heat flow calorimeter, to determine the energy involved in the adsorption process of the protein.
      
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The author's previous work indicated that the activity of granular fused iron catalysts decreased seriously with time due to the gradual plugging up of the pore volume of catalysts by the high boiling point products. In this paper, the activity data were treated with Wheeler's internal diffusion law mathematically. And the results suggest that the rate is a chemical controlling one in the initial period of the synthesis, and the coefficient of the catalysts surface is of 0.98 (with space velocity 1000 hr~(-1),...

The author's previous work indicated that the activity of granular fused iron catalysts decreased seriously with time due to the gradual plugging up of the pore volume of catalysts by the high boiling point products. In this paper, the activity data were treated with Wheeler's internal diffusion law mathematically. And the results suggest that the rate is a chemical controlling one in the initial period of the synthesis, and the coefficient of the catalysts surface is of 0.98 (with space velocity 1000 hr~(-1), CO conversion 90% or so). When the catalysts pore volume are plugged up by the high boiling point products (whether the pore to be micro or macro), the rate becomes an internal diffusion controlling one, and the effectiveness of the catalytic surface changed into 0.082. The calculated coefficient of diffusion is of 2.4 10~(-5) cm~2/sec, which is in agreement with the magnitude of liquid-phase diffusion. Under the diffusional controlling conditions, the activity level of catalysts depends upon Deff, ks and Sg, by the rate law k∝2~(1/Deff·ks·Sg.) Where change of effective diffusivity. Deff, under the liquid phase conditions is not essential. But both the specific reaction rate, ks, and the effective surface, Sg are the major factors to the catalytic activity improvements. Therefore the precipited iron catalysts, owing to its high specific surface area and high specific activity, may be the promising one of the granular catalysts suitable for the high space velocity synthesis.

已往的工作指出,顆粒熔鉄催化剂在合成过程中活性有随时間下降的現象,认为主要是由于腊液堵塞孔隙的关系,应用成型方法构成大孔,能够有利于腊液的流出,延緩了活性下降的时間,但当腊液堵滿孔隙时,活性下降的水平仍与未成型的顆粒催化剂相近。本文根据活性方面的数据,进行了宏观动力学的分析,由动力学計算再次指明:当腊液未堵塞孔隙吋,合成反应是化学反应控制,此时表面有效利用系数达0.98(空速1000,CO轉化90%以上)。而当腊液堵塞孔隙后,轉为液相扩散控制,对362-1大顆粒催化剂言,此时表面有效利用系数为0.082,并求得气体通过液柱的扩散系数为2.4×10~(-5)厘米~2/秒。在扩散控制的情况下,由动力学分析指明,能影响活性水平的主要是Deff、Ks、Sg。有效扩散系数Deff在液相扩散情况下的改变是不大的,增大孔径并不能提高扩散控制时的活性水平。因此,孔径的增大在合成烃情况下仅起延緩腊液的积聚作用,而不能提高終活性的水平。由动力学分析指出,沉淀剂由于有大的表面积(較熔鉄剂大数倍以至数十倍),因此,可能适用于高速固定床操作而不須进行再生。实驗也驗証了这个看法。

The crystallite dimensions of a new solvay type catalyst for propylene polymerization were determined from the data of breadth of X-ray diffraction lines at half peak intensity. The crystallites have the size of about 100 A and they are smaller then those prepared by other methods. Their catalytic activity increases linearly with decreasing crystallite size.Surface area and pore structure of the catalyst were determined by elution chro-matographic method on model ST-03 analyzer. Our results showed that such...

The crystallite dimensions of a new solvay type catalyst for propylene polymerization were determined from the data of breadth of X-ray diffraction lines at half peak intensity. The crystallites have the size of about 100 A and they are smaller then those prepared by other methods. Their catalytic activity increases linearly with decreasing crystallite size.Surface area and pore structure of the catalyst were determined by elution chro-matographic method on model ST-03 analyzer. Our results showed that such catalyst possess high specific surface area and large pore volume and has both large and fine pores. Therefore, active centres can be fully available.

用X射线衍射法测定了索尔维型丙烯聚合新催化剂的微晶粒大小为100A左右,比其它方法所制得的同类型催化剂微晶粒要小;并发现催化剂活性与微晶粒大小几乎成线性关系,微晶粒越小催化活性越高。 用ST-03型比表面、孔径分布测定仪研究了催化剂的孔结构。结果表明本催化剂具有较大的比表面和孔体积及粗细孔均备的优良孔结构,保证钛活性中心的充分利用,因而催化剂表现出较高的催化活性。

A new type of polymeric adsorbent possessing both high specific surface area and certain polarity was made of chloromethylated cross-linked polystyrene and phenol by Friedel Crafts reaction. Dichloroethane and nitrobenzene were used as mixed solvents and aluminium chloride was used as catalyst. The reaction temperature was kept at 40℃to 125℃. Results showed that the capacities of the resins for adsorbing phenol from waste water were two times as high as that of Amberlite XAD-4 made by the Rohm and...

A new type of polymeric adsorbent possessing both high specific surface area and certain polarity was made of chloromethylated cross-linked polystyrene and phenol by Friedel Crafts reaction. Dichloroethane and nitrobenzene were used as mixed solvents and aluminium chloride was used as catalyst. The reaction temperature was kept at 40℃to 125℃. Results showed that the capacities of the resins for adsorbing phenol from waste water were two times as high as that of Amberlite XAD-4 made by the Rohm and Haas Co. in the U.S.A. Besides, its kinetic property and adsorptability were better than that of XAD-4. The adsorption capacities of the resins after 50 cycles remain unchanged.

用二氯乙烷和硝基苯作溶剂,三氯化铝等作催化剂,使氯甲基化交联聚苯乙烯和苯酚在40—125℃进行Fricdel-Crafts反应。制成一种具有较高比表面和一定极性的吸附树脂。它对废水中苯酚的吸附能力是Amberlite XAD-4树脂的两倍,其动力学性能、应用范围和抗干扰能力也较好,经50次循环使用,性能无明显变化。

 
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