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activity site
相关语句
  活性中心
    It was found that the main reason of catalytic deactivation is the formation of NiOcrystal thus reducing the number of activity site on the catalyst Surfaces, and the secondary reason is the decrease of surface area and the formation of NiA12O4. on a part of active sites.
    发现催化剂失活主要是由于活性中心Ni0聚集并形成晶相,因而降低了催化剂表面活性中心数,其次是由于部分活性中心形成难还原的NiA12O4物种和催化剂比表面降低。
短句来源
    The results obtainted from TPR,TPD and CO adsorption indicate that the addition of samarium oxide can decrease the reduction temperature of NiO,increase the amount of absorbed H 2 and the number of activity site,and also make the charge density higher.
    TPR、TPD、CO吸附结果表明,海泡石和钐能使镍的还原温度降低,氢吸附量增大,活性中心增加,同时使镍原子电子密度增高。
短句来源
    The activity of modified EFE is 85% of that of free EFE. It means that the activity site of EFE almost weren't changed.
    修饰酶的活力为天然酶的85%,结果表明酶的活性中心基本保持不变。
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  activity site
RM1P was antigenic and reacted with polyclonal sera and 5 monoclonal antibodies (MAbs) spanning 4 epitopes including the membrane binding site and the transcription inhibition activity site.
      
These studies allow a tentative assignment of the cofactor activity site to the residues 177-322 of the 549 amino acid long chain of C4b-binding protein but indicated that residues in the region 332-395 are important in the binding activity.
      
The two non-responding experiments were conducted on a wall-drained, low-activity site (ARA means ranging 17-68 n moles ethylene core-1 h-1), the responding experiment was conducted on a poorly drained, high-ARA site.
      
MB+ and BNAH were separately accommodated within the β-CD cavity and the cavity walls may protect the activity site of the reactants.
      
Multivariate analysis classified the sampling sites in four groups based on the metal content in vegetal leaves in agreement with traffic and human activity site.
      
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The activity and selectivity of catalysts Cu-ZrO2/SiO2 and Cu-ZnO/SiO2 for reaction of methanol dehydrogenation to methyl formate were exploed and compared at 270℃ and normal pressure. The results show that Cu-ZrO2/SiO2 is superior to Cu-ZnO/SiO. XRD results prove that Cu species are the activity sites. When ZrO2 is added. DTA results show that the decomposition of Cu(NO3)2 is deceleated and TPR results show that the reduction temperature of CuO is decreased by addition of ZrO2.Thus the promoter...

The activity and selectivity of catalysts Cu-ZrO2/SiO2 and Cu-ZnO/SiO2 for reaction of methanol dehydrogenation to methyl formate were exploed and compared at 270℃ and normal pressure. The results show that Cu-ZrO2/SiO2 is superior to Cu-ZnO/SiO. XRD results prove that Cu species are the activity sites. When ZrO2 is added. DTA results show that the decomposition of Cu(NO3)2 is deceleated and TPR results show that the reduction temperature of CuO is decreased by addition of ZrO2.Thus the promoter action of ZrO2 is explained.

考察了常压和270℃时甲醇催化脱氢制取甲酸甲酯反应中Cu-ZrO2/Si4和Cu-ZrO/SiO4催化剂的活性和选择性,并对催化剂进行了表征.结果表明,Cu-ZrO/SiO4催化剂的反应性能优于Cu-ZrO/SiO2催化剂.X射线衍射分析表明,零价铜是催化活性中心.差热分析表明,ZrO2的加入缓和了Cu(NO3)2的热分解过程.程序升温还原实验表明,加入ZrO2后,降低了CuO的还原温度.根据上述实验结果,解释了ZrO2的助催化作用.

The mechanism of propane ammoxidation by means of Monte Carlo approach has been studied in this paper.The double-activity-site eatalytic surface model has been proposed based on the V/Sb catalyst,on which the rule of product distribution as a function of feed composition has been investigated.The simulation results are consistent with the references'experimental results. This indicates that the complex surface model presented is reasonable,and the Monte Carlo simulation to complex mechanism is feasible....

The mechanism of propane ammoxidation by means of Monte Carlo approach has been studied in this paper.The double-activity-site eatalytic surface model has been proposed based on the V/Sb catalyst,on which the rule of product distribution as a function of feed composition has been investigated.The simulation results are consistent with the references'experimental results. This indicates that the complex surface model presented is reasonable,and the Monte Carlo simulation to complex mechanism is feasible.

本文应用MonteCarlo方法对丙烷氨氧化的反应机理进行了初步研究。首先在分析了V/Sb金红石构型催化剂的各个晶面之后,以110面为模板建立了V/Sb双活性中心模型,在此基础上,对丙烷、氨及氧的不同进料摩尔比率对丙烯腈、丙烯及COx三种产物的影响规律进行了详细考察。在与实验相近的区间内,得到了与文献一致的结果,同时对于超出实验区间的情形,也给出了其影响的规律,从而完善了整个过程。得到了适宜的进料摩尔比率,在此优化的比率下,取得了高的丙烯腈生成速率和选择性,同时副产减少,从而显示了MonteCarlo方法对实际催化过程具有的指导意义。

The deactivated mechanism and the reactivated conditions for the catalysts used in reforming natural gas with carbon dioxide to produce syngas have been studied by using XRD, TPR, XPS techniques, together with determinations of specific Surface area and pore structure, and the micro catalytic reactor. It was found that the main reason of catalytic deactivation is the formation of NiOcrystal thus reducing the number of activity site on the catalyst Surfaces, and the secondary reason is the decrease of...

The deactivated mechanism and the reactivated conditions for the catalysts used in reforming natural gas with carbon dioxide to produce syngas have been studied by using XRD, TPR, XPS techniques, together with determinations of specific Surface area and pore structure, and the micro catalytic reactor. It was found that the main reason of catalytic deactivation is the formation of NiOcrystal thus reducing the number of activity site on the catalyst Surfaces, and the secondary reason is the decrease of surface area and the formation of NiA12O4. on a part of active sites. The optimum conditions for catalyst reactivation were found. The activity can be renewed to the fresh one by the treatment with crystal disperser B.

采用XRD,XPS技术,配合比表面、孔结构测定和催化微反技术,研究了天然气和CO2转化制合成气催化剂失活机制和再生条件。发现催化剂失活主要是由于活性中心Ni0聚集并形成晶相,因而降低了催化剂表面活性中心数,其次是由于部分活性中心形成难还原的NiA12O4物种和催化剂比表面降低。找到了一种催化剂再生的最佳条件,通过使用晶相分散剂B可以使催化剂恢复到新鲜催化剂的活性。

 
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