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分散量
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  dispersion capacity
    DISPERSION STATE AND DISPERSION CAPACITY OF AlCl 3 AND FeCl 3 ON γ Al 2O 3 SURFACE
    易潮解化合物AlCl_3和FeCl_3在载体表面的分散状态及分散量
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 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
  “分散量”译为未确定词的双语例句
    Dispersion and Thresholds for WO_3 on Complex Supports of TiO_2/γ-Al_2O_3 and TiO_2/SiO_2
    WO_3在TiO_2/γ-Al_2O_3和在TiO_2/SiO_2复合载体表面的分散状态和最大分散量
短句来源
    XRD, HRTEM, N2 sorption isotherms and BJH pore size distribution results all reveal that the ordered structure of MCM-41 is destroyed for the larger amount of dispersed MoO3.
    MoO3的含量大于单层分散阈值,通过加热不能使MoO3完全分散在MCM-41表面,而且XRD、HRTEM、氮吸附-脱附等温线和孔径分布都表明由于MoO3的分散量较大,载体MCM-41的有序介孔结构遭到破坏.
短句来源
    1) The mechanism of formation was first investigated from view point of the effects of the synthesis conditions on the long-range order structure of MCM-41. It has been concluded that under the experimental conditions the hexagonal-ordered structure of MCM-41 is formed through a cooperative interaction between the inorganic anions and surfactant cations,and not via a lamellar mesophase.
    同晶取代元素种类及引入量不同,MCM-41的长程有序和表面结构有所不同,并可在一定程度上调变MCM-41的孔结构特征; 合成后,以在MCM-41的内孔表面分散金属氧化物的方法对MCM-41进行改性,不仅可以保持较好的长程有序结构,而且通过改变分散量可调控MCM-41的孔结构。
短句来源
    The effects of activated carbon modification,results determined from dispersion amounts of CuCl,the different LaCl_3 adding amounts were studied,with the combination of the absorbent and preparation conditions optimized.
    考察了活性炭改性、CuCl分散量、稀土不同掺入量对吸附剂分离乙烯/乙烷性能的影响,并优化吸附剂配方及制备条件。
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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.
      
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Titania coated alumina and silica were used as supports for coppercatalysts in the dehydrogenation of methanol to methyl formate. Thecatalysts with TiO2coated and uncoated support were characterized andtheir activity,selectivity and stability were Studied at 250℃ and normalpressure. It is found that titania coating improves significantly the activity and stability of the copper catalysts. It also lowers the reductiontemperature, increases the degree of reduction of CuO on Al2O3 andSiO2 and improves the monolayer...

Titania coated alumina and silica were used as supports for coppercatalysts in the dehydrogenation of methanol to methyl formate. Thecatalysts with TiO2coated and uncoated support were characterized andtheir activity,selectivity and stability were Studied at 250℃ and normalpressure. It is found that titania coating improves significantly the activity and stability of the copper catalysts. It also lowers the reductiontemperature, increases the degree of reduction of CuO on Al2O3 andSiO2 and improves the monolayer spreading of CuO on the supports.Among the catalysts studied, Cu/TiO2 /Al2O3 shows the highest activity,selectivity and stability. Two Cu(0) species were detected by XPS,probably existing in different chemical environments, namely Cu(0 ) onalumina and another on TiO2-Al2O3. Decrease in surface area and Cu/Al and Cu/Si ratios and increase in surface carbon were observedafter reaction, indicating the occurrence of Cu aggregation and coking.

在常压和250℃下,考察了涂层TiO_2改性铜催化剂上甲醇脱氢生成甲酸甲酷的活性和选择性以及催化剂的稳定性.结果表明,涂层TiO2明显提高了铜催化剂的活性和稳定性.在所考察的铜催化剂中,以Cu/TiO2/Al2O3的催化活性最高,甚至高于离子交换法制备的Cu(ex)/SiO3催化剂.XPS分析表明,Cu/TiO2/Al2O3中存在着两种化学环境不同的Cu(0),即负载在γ-Al2O3和TiO2-Al2O3表面上的Cu(0).涂层TiO2使CuO/Al2O3和CuO/SiO2中CuO的还原温度降低,还原度增大,CuO单层分散量增加.在反应气氛中,由于催化剂表面铜的迁移聚集、表面积炭、比表面降低等因素,因而导致催化剂失活.

The dispersion and the thresholds for WO3 on the complex supports of TiO2/γ- Al2O3 and TiO2/SiO2 have been studied by X-ray diffraction(XRD)and laser raman spectroscopy(LRS)techniques.The complex supports of TiO2/γ-Al2O3 and TiO2/SiO2 were prepared by using a TiCl4 gas-flow continuous adsorption method,and the series of WO3/(TiO2/γ-Al2O3)and WO3/(TiO2/SiO2)catalyst samples were prepared by impregnating the complex supports with ammonium metatungstate solutions,drying,and calcining at 773 K for 24 h.The results...

The dispersion and the thresholds for WO3 on the complex supports of TiO2/γ- Al2O3 and TiO2/SiO2 have been studied by X-ray diffraction(XRD)and laser raman spectroscopy(LRS)techniques.The complex supports of TiO2/γ-Al2O3 and TiO2/SiO2 were prepared by using a TiCl4 gas-flow continuous adsorption method,and the series of WO3/(TiO2/γ-Al2O3)and WO3/(TiO2/SiO2)catalyst samples were prepared by impregnating the complex supports with ammonium metatungstate solutions,drying,and calcining at 773 K for 24 h.The results show that WO3 is dispersed as a monolayer on the surface of TiO2/γ-Al2O3 complex support,with the dispersion threshold 0.180g WO3/100m2(TiO2/γ-Al2O3).It is quite the same as the value,0.189g WO3/100m2,calculated from the model on assuming that the WO3 is dispered as a close-packed monolayer on the TiO2/γ-Al2O3 complex support surface. However the results show that the WO3 is not dispersed as a monolayer on the surface of TiO2/SiO2 complex support,with the dispersion threshold of 0.037g WO3/100 m2(TiO2/SiO2) much less than that value calculated. LRS measurments show that the interaction between WO3 and γAl2O3 or between WO3 and SiO2 can be weakened or strengthend as the surfaces of γ-Al2O3 or SiO2 are modified by TiO2.So that the catalytic activity can be improved by adjusting and changing the dispersion and the character of WO3 on γ-Al2O3 or WO3 on SiO2.

WO_3在TiO_2/γ-Al_2O_3和在TiO_2/SiO_2复合载体表面的分散状态和最大分散量邓存,陈巧平(宁德师范专科学校化学系,宁德352100)刘英骏(北京大学物理化学研究所,北京100871)关键词WO_3/(TiO_2/γ-Al_2O_3)催化...

In this paper,the catalysis of Al_2 (SO_4)_3/γ-Al_2O_3 for butene oligomerization has been studied.It has been found that the change of Al_2(SO_4)_3 loading has a marked effect on activity.As the loading of Al_2(SO_4)_3 increased the coversion of butene rose sharply at first,then reached a maximum value ca.91.6%with 19.0wt%of Al_2(SO_4)_3.The conversion decreased as the loading further increased.We studied the relationship between the content of the monolayer dispersion phase and the loading of Al_2(SO_4) _3...

In this paper,the catalysis of Al_2 (SO_4)_3/γ-Al_2O_3 for butene oligomerization has been studied.It has been found that the change of Al_2(SO_4)_3 loading has a marked effect on activity.As the loading of Al_2(SO_4)_3 increased the coversion of butene rose sharply at first,then reached a maximum value ca.91.6%with 19.0wt%of Al_2(SO_4)_3.The conversion decreased as the loading further increased.We studied the relationship between the content of the monolayer dispersion phase and the loading of Al_2(SO_4) _3 in Al_2(SO_4)_3/γ-Al_2O_3 catalyst and the acidity by XRD,TG 、TG-adsorption of NH_3 methods.The results show that Al_2(SO_4)_3 on γ- Al_2O_3 surface has two states of monolayer dispersion and crystalline form,When the amount of Al_2(SO_4)3 loaded is low,the Al_2(SO_4)_3 will be dispersed onto γ-Al_2O_3 surface as monolayer.In case the amount is higher than the maximum monolayer dispersion capacity,the residual crystalline form of Al_2(SO_4)_3 will appear.The maximum monolayer dispersion capacity-the threshold has been determined,and the values obtained by XRD、TG、TG-adsorption of NH_3 are often very close. It has also been found that the threshold determined agrees with the value calculated ,when we assume the active compound Al_2(SO_4)_3 in the catalyst forms a close- packed monolayer on the surface of γ- Al_2O_3. Oxides or salts dispersed on the surface of γ- Al_2O_3 cause the acidity of surface to increase and the maximum acidity often appears at the point of threshold.It indicates that the surface acidity in the system originates from the salts of monolayer dispersion on the carriers surface.

用XRD、TG、热重氨吸附法等手段,测定了Al_2(SO_4)_3/γ-Al_2O_3中单层分散相与Al_2(SO_4)_3担载量之间的关系,测定了表面单层最大分散量一阈值。其与用密置单层模型计算所得值接近,这为Al_2(SO_4)_3在γ-Al_2O_3上单层分散行为提供了证据,且将该催化剂的表面行为与其对丁烯齐聚反应活性进行了关联。

 
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