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分散量    
相关语句
  dispersion capacity
    Dispersion Capacity of α-Fe_2O_3 on Mesoporous Molecular sieve MCM-41
    α一Fe_2O_3在介孔分子筛MCM一41上的最大分散量
短句来源
    The specific surface and pore volumes of MoO3/γ-Al2O3 systems determined also support the close-packed monolayer model, because the specific surfaces or pore volumes per gram r-Al2O3 keep on almost no change as the amounts of MoO3 in MoO3/γ-Al2O3 samples exceed the monolayer dispersion capacity (see Fig. 6-8).
    这样可以通过X光衍射测定MoO_3在每克γ-Al_2O_3上的最大分散量而得到γ-Al_2O_3的比表面。
短句来源
    The results show that PtO_2 can disperse as a monolayer onto the surface of γ-Al_2O_3. A monolayer dispersion capacity (threshold) of 0.0246g PtO_2/100m~2 γ-Al_2O_3 surface is observed. When the PtO_2 content in a PtO_2/γ-Al_2O_3 sample exceeds the threshold, residual PrO_2 phase appears.
    结果表明,PtO_2可在载体上单层分散,其最大单层分散量(阈值)为0.0246g PtO_2/100m~2γ-Al_2O_3,当PtO_2量超过阈值时,出现剩余PtO_2物相。
短句来源
    XRD,TPR and catalytic performance evaluation were used to study influence of promotors on the maximum dispersion capacity and catalytic performance of the supported nickel catalysts for CO 2-reforming of CH 4 to syngas.
    应用XRD、TPR和催化活性评价手段 ,考察了助剂对CH4 与CO2 重整制合成气的负载型Ni催化剂的最大分散量和其催化性能的影响。
短句来源
    when Fe(NO3)3·9H2O was used as raw material,the dispersion capacity is 0.58g α-Fe2O3/g MCM-41;
    当以硝酸铁为铁源时 ,α -Fe2 O3 最大分散量为 0 .5 8gα -Fe2 O3 /gMCM - 41;
短句来源
  dispersion amount
    The maximum dispersion amount of α-Fe_2O_3 on NaY zeolite measured with XRD quantitative phase analysis is 0.060 gα-Fe_2O_3/gNaY, which is only 5.5% of the monolayer capacity of α-Fe_2O_3 on NaY according to a close-packed monolayer model.
    经XRD相定量外推法测定,α-Fe_2O_3在NaY沸石上的最大分散量为0.060gα-Fe_2O_3/gNaY,仅占α-Fe_2O_3在沸石表面密置单层量的5.5%。
短句来源
    For the first time positron lifetime spectroscopy has been used to detect the dispersion amount of oxide on zeolite. The maximum dispersion amount of α-Fe_2O_3 obtained is fully consistent with that obtained from XRD phase analysis.
    首次尝试用正电子寿命谱方法测定α-Fe_2O_3在沸石表面的最大分散量,所得结果与XRD方法完全吻合。
短句来源
    According to the theory of spontaneous monolayer dispersion of salt ontocarrier,the interaction between CaCl_2 and 10Xzeolitewasstudied by using XRD,the effects of temperatureson the dispersion amount and the dispersion amount on the framework of 10X zeolite were discussed.
    利用自发单层分散原理,通过XRD技术研究了CaCl2与10X分子筛的相互作用,讨论了温度对CaCl2分散量以及分散量对分子筛骨架结构的影响。
短句来源
    The destroyed degreeof 10X existthe direct proportionwith the dispersion amount of CaCl_2.
    10X分子筛结构受到破坏程度与CaCl2的分散量之间存在正比关系。
短句来源
    The BET surface areas of these supports were examined by BET method, the status of dispersion and the chemical dispersion amount of WO_3 in different supports were also examined by XRD and ammonia-disslove action test. The effect of interaction between WO_3 and support on the dispersibility of WO_3 were discussed.
    通过BET方法测定了载体的比表面积 ,采用XRD、氨溶-分光光度法 ,测定了WO3在不同载体上的分散状态及化学分散量 ,探讨了WO3与不同载体的相互作用以及对WO3在载体上的分散性的影响。
短句来源
更多       
  dispersion capacity
    Dispersion Capacity of α-Fe_2O_3 on Mesoporous Molecular sieve MCM-41
    α一Fe_2O_3在介孔分子筛MCM一41上的最大分散量
短句来源
    The specific surface and pore volumes of MoO3/γ-Al2O3 systems determined also support the close-packed monolayer model, because the specific surfaces or pore volumes per gram r-Al2O3 keep on almost no change as the amounts of MoO3 in MoO3/γ-Al2O3 samples exceed the monolayer dispersion capacity (see Fig. 6-8).
    这样可以通过X光衍射测定MoO_3在每克γ-Al_2O_3上的最大分散量而得到γ-Al_2O_3的比表面。
短句来源
    The results show that PtO_2 can disperse as a monolayer onto the surface of γ-Al_2O_3. A monolayer dispersion capacity (threshold) of 0.0246g PtO_2/100m~2 γ-Al_2O_3 surface is observed. When the PtO_2 content in a PtO_2/γ-Al_2O_3 sample exceeds the threshold, residual PrO_2 phase appears.
    结果表明,PtO_2可在载体上单层分散,其最大单层分散量(阈值)为0.0246g PtO_2/100m~2γ-Al_2O_3,当PtO_2量超过阈值时,出现剩余PtO_2物相。
短句来源
    XRD,TPR and catalytic performance evaluation were used to study influence of promotors on the maximum dispersion capacity and catalytic performance of the supported nickel catalysts for CO 2-reforming of CH 4 to syngas.
    应用XRD、TPR和催化活性评价手段 ,考察了助剂对CH4 与CO2 重整制合成气的负载型Ni催化剂的最大分散量和其催化性能的影响。
短句来源
    when Fe(NO3)3·9H2O was used as raw material,the dispersion capacity is 0.58g α-Fe2O3/g MCM-41;
    当以硝酸铁为铁源时 ,α -Fe2 O3 最大分散量为 0 .5 8gα -Fe2 O3 /gMCM - 41;
短句来源
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  dispersion capacity
The dispersion capacity values of CuO measured by the two methods are consistent, which are of 1.20 mmol CuO/100 m2 CeO2.
      
1The dispersion capacity of MoO3 supported on CeO2 is 0.81 rnmo1/100 m2.
      
The dispersion capacity of MoO3 on the surface of α-Fe2O3 determined by XRD and XPS was 0.8 mmol/100m2 α-Fe2O3 in the samples calcined at 420°C.
      
Slurry prepared MoO3/γ-Al2O3 catalyst exhibited higher activity and dispersion capacity than conventional one.
      
Slurry prepared MoO>amp;lt;Subscript>amp;gt;3>amp;lt;/Subscript>amp;gt;/>amp;amp;ggr;-Al>amp;lt;Subscript>amp;gt;2>amp;lt;/Subscript>amp;gt;O>amp;lt;Subscript>amp;gt;3>amp;lt;/Subscript>amp;gt; catalyst exhibited higher activity and dispersion capacity than conventional one.
      
更多          
  dispersion quantity
Although the thermal diffusivity showed a decreasing trend with the U-Mo volume fraction when the dispersion quantity was insignificant, the trend reversed with a higher dispersion level.
      
  dispersion capacity
The dispersion capacity values of CuO measured by the two methods are consistent, which are of 1.20 mmol CuO/100 m2 CeO2.
      
1The dispersion capacity of MoO3 supported on CeO2 is 0.81 rnmo1/100 m2.
      
The dispersion capacity of MoO3 on the surface of α-Fe2O3 determined by XRD and XPS was 0.8 mmol/100m2 α-Fe2O3 in the samples calcined at 420°C.
      
Slurry prepared MoO3/γ-Al2O3 catalyst exhibited higher activity and dispersion capacity than conventional one.
      
Slurry prepared MoO>amp;lt;Subscript>amp;gt;3>amp;lt;/Subscript>amp;gt;/>amp;amp;ggr;-Al>amp;lt;Subscript>amp;gt;2>amp;lt;/Subscript>amp;gt;O>amp;lt;Subscript>amp;gt;3>amp;lt;/Subscript>amp;gt; catalyst exhibited higher activity and dispersion capacity than conventional one.
      
更多          
  其他


Crystalline MoO3 and γ-Al2O3 carrier were mixed thoroughly and the mixture was calcined at an appropriate temperature below the melting point of MoO3, e.g. 400℃, 24 hours. If the quantity of MoO3 added is lower than a threshold value, after calcination the X-ray diffraction (XRD) peaks of crystalline MoO3 disappear; if the quantity is higher than that value, the peaks do not disappear due to the residual crystalline MoO3. The content of such residual MoO3 could be determined by the XRD procedure. A maximum dispersion...

Crystalline MoO3 and γ-Al2O3 carrier were mixed thoroughly and the mixture was calcined at an appropriate temperature below the melting point of MoO3, e.g. 400℃, 24 hours. If the quantity of MoO3 added is lower than a threshold value, after calcination the X-ray diffraction (XRD) peaks of crystalline MoO3 disappear; if the quantity is higher than that value, the peaks do not disappear due to the residual crystalline MoO3. The content of such residual MoO3 could be determined by the XRD procedure. A maximum dispersion of 0.12g/100m2 of MoO3 on γ-Al2O3 surface was observed, it agrees with the result (0.117g/100m2) calculated from the model on the assumption that MoO3 is a closed monolayer on γ-Al2O3 surface. This method may also be used to determine the maximum dispersion of other compounds on carriers with considerable specific surface.

晶相MoO_3与载体γ-Al_2O_3充分混合后,在低于MoO_3熔点的适当温度下焙烧(例如400℃焙烧24小时),当MoO_3含量低于某一数值时,MoO_3晶相的X光衍射峰完全消失;MoO_3含量高于该数值时,晶相峰并不消失,但强度减弱。用X光衍射可测定焙烧后MoO_3的残余晶相量,进而可得到MoO_3在γ-Al_2O_3表面的最大分散量为0.12克/100米~2。这与按密置单层排布的模型计算所得到的理论量0.117克/100米~2非常一致。本文方法也适用于其它化合物在载体表面最大分散量的测定。

The monolayer dispersion capacities of MoO3 on γ-Al2O3 (or η A12O3) of different kinds with different specific surface, which were made from boehmite,bayerite and gibbsite, calcined at different temperatures were determined by XRD and specific surface measurement. Their values are nearly the same (around 0.12-0.13 g MoO3/100 m2 surface of γ-Al2O3) and close to 0.117 g MoO3/100m2 surface of r-A12Q3 calculated from a close-packed monolayer model (see Fig. 1-3 and Table 1). Samples of MoO3/Al2O3 prepared by impregnation...

The monolayer dispersion capacities of MoO3 on γ-Al2O3 (or η A12O3) of different kinds with different specific surface, which were made from boehmite,bayerite and gibbsite, calcined at different temperatures were determined by XRD and specific surface measurement. Their values are nearly the same (around 0.12-0.13 g MoO3/100 m2 surface of γ-Al2O3) and close to 0.117 g MoO3/100m2 surface of r-A12Q3 calculated from a close-packed monolayer model (see Fig. 1-3 and Table 1). Samples of MoO3/Al2O3 prepared by impregnation method or by heating the mixture of MoO3 and A12O3 gave the similar results (see Fig. 4, 5). The specific surface and pore volumes of MoO3/γ-Al2O3 systems determined also support the close-packed monolayer model, because the specific surfaces or pore volumes per gram r-Al2O3 keep on almost no change as the amounts of MoO3 in MoO3/γ-Al2O3 samples exceed the monolayer dispersion capacity (see Fig. 6-8). It is suggested that the specific surface of γ-Al2O3 (or Al2O3) can be obtained from the XRD determination of the monolayer dispersion capacity of MoO3 on the γ-Al2O3 (or η-A12O3).

MoO_3与不同制备方法和来源的γ-Al_2O_3(包括η-Al_2O_3)干混、焙烧制备的样品,或者用浸渍、焙烧制备的样品,通过X光衍射测得的MoO_3最大分散量都与按密置单层模型计算得到的结果(每100米~2γ-Al_2O_3表面0.117克MoO_3,即4.9×10~(18)Mo原子/米~2)相近。这样可以通过X光衍射测定MoO_3在每克γ-Al_2O_3上的最大分散量而得到γ-Al_2O_3的比表面。比表面和孔容的研究结果也支持MoO_3在γ-Al_2O_3表面呈密置单层分散的模型。

The systems of MoO3/TiO2, MoO3/SiO2 and MoO3/MgO, by mixing crystalline MoO3 with one of these carriers respectively and then being calcined at appropriate temperature, have been studied by X-ray diffraction. The results show that MoO3 disperses on titania surface as a close-packed monolayer, the experimental maximum dispersion capacity (the threshold value) of MoO3 on titania surface is 0.12g MoO3 /100m2 (i. e. 4.9×1018Mo atoms/m2, see Figs. 1,2), which agrees with the calculated value according to a close-packed...

The systems of MoO3/TiO2, MoO3/SiO2 and MoO3/MgO, by mixing crystalline MoO3 with one of these carriers respectively and then being calcined at appropriate temperature, have been studied by X-ray diffraction. The results show that MoO3 disperses on titania surface as a close-packed monolayer, the experimental maximum dispersion capacity (the threshold value) of MoO3 on titania surface is 0.12g MoO3 /100m2 (i. e. 4.9×1018Mo atoms/m2, see Figs. 1,2), which agrees with the calculated value according to a close-packed monolayer model, as in the case of MoO3/γ-Al2O3 system[5]. The experiments also show MoO3 disperses on silica surface as a monolayer but not a close-packed one, its monolayer dispersion capacity is 0.032g MoO3/100m2 (i. e. 1.4×1018 Mo atoms/m2) corresponding to a coverage θ = 0.27 (see Figs. 3 - 5). For MoO3/MgO system, the experiments show that a solid reaction between MoO3 and MgO occurs at 290℃ to form MgMoO4 to some extent in stead of a monolayer dispersion (see Fig. 7). All these systems with the addition of MoO3/γ-Al2O3 system have been compared (see Table 1) and discussed based on the acid-base properties of carriers, their chemical bonds and their structures. MgO, an oxide of ionic bond and rather stronger basicity, reacts with MoO3 forming a bulk compound MgMoO4. However, it is not easy for SiO2, of covalent bond and non-metallic oxide property, to carry out a reaction with MoO3. Both of γ-Al2O3 and TiO2 are in the intermediate case, therefore MoO3 can disperse on them as close-packed monolayers.

用X光衍射研究了MoO_3/TiO_2,MoO_3/SiO_2和MoO_3/MgO等体系。结果表明,MoO_3在TiO_2胶表面呈密置单层分散,其最大分散量(阈值)与按密置单层模型计算的0.117克MoO_3/100米~2(即4.9 × 10~(18)Mo原子/米~2)相符。MoO_3在SiO_2胶表面呈单层分散但非密置单层,其分散阈值为 0.032克MoO_3/100米~2(即 1.4 × 10~(18)Mo原子/米~2)。MoO_3与MgO比较容易进行体相反应,在290℃即已有部分MgMoO_4形成,没有只形成表面单层分散的阶段,因此不存在表面分散阈值,还联系载体的酸碱性、化学键性质以及结构上的差异,对MoO_3/γ-Al_2O_3和上述体系进行了讨论和比较。

 
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