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high specific surface
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  高比表面
    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
    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
    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
    HTiNbO_5 was pre-expanded by long-chain alkylamine,then reacting with a solution containing Ti(IV) polycations,followed by calcining the obtained precursor in air,two titanoniobium composite oxides(designated as HTNO) with a high specific surface area were prepared.
    HTiNbO5经用长链有机胺预支撑,再与含Ti(IV)聚合阳离子溶液反应,所得产物在空气气氛中焙烧后制备出高比表面钛铌复合氧化物。
短句来源
    Preparation of Porous SiO 2 with High Specific Surface Area by Sodium Silicate
    硅酸钠法合成高比表面多孔二氧化硅
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  高比表面的
    Therefore, incorporating HPA into Porous materials effectively will be of fundamental and practical significance. In this paper, via dipping technique, PWA was immobilized into the supporter SiO_2 with high specific surface, which is prepared by sol-gel method, and then they were characterized by FT - IR, XRD, BET, TG-DSC and UV-Vis DRS.
    论文拟采用溶胶.凝胶法合成高比表面的SiO_2作为催化剂载体,用浸渍法制备固载化磷钨酸催化剂,并用XRD、FT-IR、BET、XRF、TG-DSC、UV-Vis、DRS等手段对其理化性能进行表征;
短句来源
    High specific surface molybdenum(tungsten)nitride(carbide)used as a new type catalystic material due to its high activity in the catalystic hydrogenation and dehydrogenation reaction are highly evaluated.
    高比表面的氮化钼(钨)和碳化钼(钨)在催化加氢脱氢反应中表现出高的活性,成为催化领域中一种新型催化材料而受到重视。
短句来源
    The photocatalytic reactivity of nanostructured TiO_2 fiber with high specific surface area in phenol system has been investigated. The results show that TiO_2 fiber has good photocatalysis properties equivalent to P25.Because the morphology of the nanoporous particles in the micrometer-size range is favorable for separation,TiO_2 fiber is a good candidate for the application of industry.
    研究了具有纳米结构,高比表面的锐钛矿TiO2纤维在光催化降解苯酚体系中的氧化性能,发现其活性与P25相当; 通过加羟基自由基猝灭剂证实了羟基自由基(HO.)
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  “high specific surface”译为未确定词的双语例句
    The Phases of ZrO_2 Al_2O_3 Composites with High Specific Surface Prepared by Co precipitation
    共沉淀法制备ZrO_2-Al_2O_3纳米复合氧化物的物相表征
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
    The photocatalytic results show that for the α-Bi2O3 powders with high specific surface area formed in the microemulsion system, the photocatalytic activity for degrading the dyes of methyl orange and rhodomine B has remarkably been enhanced.
    光催化结果表明,微乳液法制备的比表面积较高的α-Bi2O3光催化降解甲基橙和罗丹明B染料的活性明显提高。
短句来源
    Moreover, Ti-PILC was also prepared using Ti(OC4H9)4 as the titanium source by sol-gel method. With suitable Ti(OC4H9)4/H2O and Ti/Clay, the Ti-PILC with large crystal plane distance and high specific surface area was attainable and DPC yield over the catalyst could reach up to 24.8%.
    以钛酸四丁酯为钛源,考察了溶胶—凝胶法制备的Ti-PILC催化剂的结构和反应性能,发现在适宜Ti(OC_4H_9)_4/H_2O和Ti/Clay比值条件下,Ti-PILC可获得较高的晶面间距和较大的比表面积,DPC收率最高可达24.8%。
短句来源
    In this paper, the mesoporous TiO_2 with the high specific surface area(S_g), high pore volumes(V_g) and big pore diameters(D) has been prepared in the presence of Brij35 as templates for the first time. The mesoporous TiO_2 and doped mesoporous TiO_2 were characterized by the means of XRD, IR, TG, HRTEM, TEM, N_2 adsorption and desorption.
    研究了模板剂含量、不同的模板剂与钛源比、焙烧温度、混合模板剂、制备方法、Y2O_3、Eu_2O_3和Co_2O_3掺杂对中孔TiO_2结构和性能的影响,并以XRD、TEM、HRTEM、TPR、BET、TG和IR等方法对中孔TiO_2及掺杂的中孔TiO_2进行了表征。
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  high specific surface
Study on catalyst carrier nano-α-alumina with high specific surface area
      
The central point in this technique is the quantitative interpretation of data, especially, for substances with a high specific surface area.
      
In porous electrodes with an immobilized enzyme the substrate must have a high specific surface area, which must be accessible to landing onto it a maximum number of enzyme molecules.
      
The use of membrane filters allows one to obtain amorphous silica with a reduced impurity content and a high specific surface area, as well as an aqueous hydrosol of colloidal silica.
      
This paper describes a simple synthetic route for the synthesis of hexagonal boron nitride (h-BN) powders with high specific surface area, in which BBr3, NH4Cl and Al powders are used as starting materials.
      
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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。

Titanium nickelide intermetallic compounds have been prepared by means of coprecipitation-reduction followed by diffusion processes, in order to obtain the cathodic material with improved hydrogen absorbing character.Titanium-nickel hydroxides are first precipited by NaOH from mixed solution of NiCl2 and TiCl4. After dehydration at 600℃, the mixed hydroxide is reduced by CaH2 to give hydrided TiNi and Ti2Ni.The coprecipitation-reduction and diffution process has been discussed in detail. The lattice parameters...

Titanium nickelide intermetallic compounds have been prepared by means of coprecipitation-reduction followed by diffusion processes, in order to obtain the cathodic material with improved hydrogen absorbing character.Titanium-nickel hydroxides are first precipited by NaOH from mixed solution of NiCl2 and TiCl4. After dehydration at 600℃, the mixed hydroxide is reduced by CaH2 to give hydrided TiNi and Ti2Ni.The coprecipitation-reduction and diffution process has been discussed in detail. The lattice parameters of TiNiH1.14 and TiNiH2.56 are 24.85A and 11.91A.The temperature-composition dissociation isobars at 1 atm. for the product and potential-time plots of TiNi and Ti2Ni electrodes have been drawn respectively. The discharge capacities were determined as 262.2 mAh/g for TiNiH1.14 and 169.9 mAh/g for Ti2NiH2.56.Since the product has higher specific surface and excellent electro-catalytic activity, electrodes made from the product have much important effect on decreasing the polarization and increasing the cycle life.

本文提出一种用共沉淀还原扩散法制备钛镍金属互化物的方法,详细讨论了共沉淀还原扩散过程,合成了比表面高、电催化活性良好的钛镍金属互化物。

 
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