助手标题  
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
   in the catalyst 在 化学 分类中 的翻译结果: 查询用时:0.099秒
图标索引 在分类学科中查询
所有学科
化学
有机化工
更多类别查询

图标索引 历史查询
 

in the catalyst
相关语句
  在催化剂
    Again passed to catalyst P/V atomic ratio determination, add differently promoters and the influence of promoters atom to the catalyst mainfested (VO)_2P_2O_7, we also the promoters' existence form in the catalyst, but also inspected the catalyst precursors to activated in the temperature and the time, the activation airspeed, the feed gas the oxygen content as well as the catalyst dry way and the increase carrier to the catalyst performance influence.
    再通过对催化剂P/V原子比的确定、不同助剂的添加以及助剂原子对催化剂主要活性相(VO)_2P_2O_7的影响,以及助剂原子在催化剂中的存在形式,考察了催化剂前驱体活化温度和时间、活化空速、原料气中氧气含量以及催化剂的干燥方式和添加载体和扩孔剂对催化剂性能的影响。
短句来源
    The results, 1.951% of P and 0.113% of Rh in the catalyst, are very close to the estimated values.
    结果表明:磷和铑在催化剂中的百分含量分别为1.951%和0.113%,与理论估算值非常接近。
短句来源
    It was found in the XRD study that CuO and ZnO exist in the catalyst before its reduction and Cu and ZnO exist in the catalyst after its reduction.
    XRD研究发现,在催化剂还原前后,分别存在CuO,ZnO和Cu-ZnO晶相.
短句来源
    100% at a Mo content of 2.47 wt% in the catalyst.
    在催化剂中Mo含量达到 2 47wt%时 ,双氧水的得率可达到 10 0 % .
短句来源
    The physicochemical properties of Bi-P catalyst system and the mechanism of oxi-dation-dehydrodimerization and aromatization of propylene were investigated by usingXPS,PAS, TPR and X-ray diffraction methods. The results indicated that propylene isdissociatively adsorbed on the surface of the catalyst and the activation of α-hydrogenis related to the strength of metal-oxygen bond in the catalyst. The products of allyloxidation depend on the electron transference between the allylic intermediates andthe catalyst.
    研究了Bi-P系催化剂物理化学性质(XPS、PAS、TPR及x-光物相分析)和对丙烯氧化脱氢芳构化的催化作用,结果表明丙烯在催化剂表面上为解离吸附,α-H的活化与催化剂金属-氧键强度有关,烯丙基的选择氧化产物取决于其与催化剂间的电子转移能力。
短句来源
更多       
  “in the catalyst”译为未确定词的双语例句
    THE VALENCE STATE OF RARE EARTH METAL IONS IN THE CATALYST SYSTEM Ln(naph)_3-Al(i-C_4H_9) _3-Al_2(C_2H_5) _3Cl_3 FOR POLYMERIZATION OF ISOPRENE
    异戊二烯聚合催化体系Ln(naph)_3-Al(i-C_4H_9) _3-Al_2(C_2H_5) _3Cl_3中稀土金属离子的价态
短句来源
    THE KINETICS OF THE POLYMERIZATION OF ACETYLENE IN THE CATALYST SYSTEMS Nd(P_(204))_3/AIEt_3/THIRD COMPONENTS
    Nd(P_(204))_3/AlEt_3/第三组分体系催化乙炔聚合动力学
短句来源
    Study on the N-High Efficiency Catalyst for Propylene Polymerization Ⅱ.The Functions of the Internal and External Electron Donors in the Catalyst System
    丙烯聚合N高效催化剂的研究 Ⅱ.催化剂体系内外给电子体的作用
短句来源
    Ester Exehange Reaction of Azlatones in the Catalyst of Sodium Acetate
    Azlatones在乙酸钠催化下的酯交换反应
短句来源
    About 20%(mass fraction) Fe enters the crystal lattice of Pt, forming the alloy with Pt. About 80%(mass fraction) Fe does not enter the crystal lattice of Pt and exists as Fe and Fe2O3. After the Pt-Fe/C catalyst being treated with acid , non-alloying Fe and Fe2O3 in the catalyst are dissolved.
    质量分数大约为20%的Fe进入Pt的晶格,形成Pt-Fe合金,质量分数大约为80%的Fe没有进入Pt的晶格而以Fe和Fe2O3的形式单独存在.
短句来源
更多       
查询“in the catalyst”译词为用户自定义的双语例句

    我想查看译文中含有:的双语例句
例句
为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。
  in the catalyst
An increase in palladium sulfide concentration in the catalyst leads to an increase in the reaction rate per 1 g of the catalyst but has only a slight effect on the specific reaction rate of hydrogenation calculated per 1 g of Pd.
      
The presence of a phase boundary in the catalyst is responsible for the V2O5 → V2O3 transition without the formation of intermediate structures.
      
In the presence of MoO3 and V2O5 in the catalyst, anatase particles underwent agglomeration as the temperature was increased.
      
The selectivity, activity, and mechanical strength of the composites depend on the calcination temperature and on the place of the hydriding step in the catalyst preparation procedure.
      
Two types of molybdenum-containing particles are stabilized in the catalyst in the course of nonoxidative methane conversion at 750°C.
      
更多          


The polymeri2ation of butadiene catalysed by the TiBr4-i-Bu3Al, TiBr4-Et3Al, and TiBr4-BuLi systems has been studied. In the catalyst system of TiBr4-i-Bu3Al with benzene as solvent there are two molar ratios of i-Bu3Al to TiBr4, which exhibit maximum catalytic activity. The gel content, molecular weight and cis-l,4-content of the soluble part of the polymer decrease with increase of the i-Bu3Al/TiBr4 ratio. The catalytic activity seems to be greater, when the monomer is first mixed with i-Bu3Al than first...

The polymeri2ation of butadiene catalysed by the TiBr4-i-Bu3Al, TiBr4-Et3Al, and TiBr4-BuLi systems has been studied. In the catalyst system of TiBr4-i-Bu3Al with benzene as solvent there are two molar ratios of i-Bu3Al to TiBr4, which exhibit maximum catalytic activity. The gel content, molecular weight and cis-l,4-content of the soluble part of the polymer decrease with increase of the i-Bu3Al/TiBr4 ratio. The catalytic activity seems to be greater, when the monomer is first mixed with i-Bu3Al than first with TiBr4. The maximum activity appears to move towards greater i-Bu3Al/TiBr4 ratio, when the polymerization temperature is lowered. If heptane is used as solvent, the rate of polymerization is reduced and only one catalyst ratio exhibits maximum activity. The gel content, molecular weight and cis-l,4-content of the soluble part of the polymer obtained all seem to be lower. If triethyl aluminium is used instead of triisobutyl aluminium, there are also two catalyst ratios exhibiting maximum activity. When the temperature of polymerization is lower, the catalytic activity of the Et3Al-TiBr4 system seems to be greater than that of the i-Bu3Al-TiBr4 system. The products obtained from both systems appear very alike. They consist of a large amount of gel and the cis-l,4-content of the soluble part of the polymer is below 70%. Catalysed by a new catalytic system-the BuLi-TiBr4 system, butadiene can be polymerized to a product containing the cis-1,4-form higher than 90%. Catalytic activity was observed for BuLi/TiBr4 with molar ratios of 1.5-2.5. The cis-l,4-content of the product becomes smaller, when the catalyst ratio is greater. The valence states of the titanium existing in the above three catalytic systems have been compared. When the metal alkyl to titanium tetrabromide ratio is lower than 2, the trivalent titanium increases with increase of catalyst ratio. When the catalyst ratio is higher than 2, the trivalent titanium decreases with increase of catalyst ratio in the BuLi/TiBr4 system, while in the other two systems the trivalent titanium still increases till 100%. It is interesting to note that the catalytic activity of the BuLi-TiBr4 system lies just between the range of catalyst ratios which possess higher content of trivalent titanium.

本工作研究了四溴化钛与三异丁基铝、三乙基铝或丁基锂组成的催化剂对丁二烯的聚合。结果指出,在三异丁基铝与四溴化钛的系统中以苯为溶剂,有两个铝钛比值呈现最大活性。随铝钛比增加,产物的凝胶及分子量下降,可溶部分顺式-1,4含量亦随之减少。聚合活性以单体先与铝混合较先与钛混合为高。聚合温度降低时最大活性向铝钛比大的区域移动。以庚烷代替苯作为溶剂时,聚合速度降低,仅有一个铝钛比呈现最大活性,产物分子量及凝胶均较低,可溶部分顺式-1,4含量亦较低。如以三乙基铝代替三异丁基铝,则仍有两个铝钛比值呈现最大活性。聚合温度较低时,三乙基铝与四溴化钴的催化活性较三异丁基铝为高。二个系统的大部分产物类似,凝胶较多,可溶部分顺式-1,4含量在70%以下。利用丁基锂与四溴化钛组合的催化系统聚合丁二烯,可得顺式-1,4含量达90%以上的产物。活性范围为锂钛克分子此1.5—2.5。顺式-1,4含量随锂钛比增大而降低。本工作还比较了上述三种催化系统生成低价钛的情况。结果指出,在金属烷基物与四溴化钛的克分子比小于2时,三价钛均随克分子比增大而增大,克分子比大于2时,丁基锂的还原能力随克分子比增加而减少。在其他二种系统中则低价钛继续增加。有意义的...

本工作研究了四溴化钛与三异丁基铝、三乙基铝或丁基锂组成的催化剂对丁二烯的聚合。结果指出,在三异丁基铝与四溴化钛的系统中以苯为溶剂,有两个铝钛比值呈现最大活性。随铝钛比增加,产物的凝胶及分子量下降,可溶部分顺式-1,4含量亦随之减少。聚合活性以单体先与铝混合较先与钛混合为高。聚合温度降低时最大活性向铝钛比大的区域移动。以庚烷代替苯作为溶剂时,聚合速度降低,仅有一个铝钛比呈现最大活性,产物分子量及凝胶均较低,可溶部分顺式-1,4含量亦较低。如以三乙基铝代替三异丁基铝,则仍有两个铝钛比值呈现最大活性。聚合温度较低时,三乙基铝与四溴化钴的催化活性较三异丁基铝为高。二个系统的大部分产物类似,凝胶较多,可溶部分顺式-1,4含量在70%以下。利用丁基锂与四溴化钛组合的催化系统聚合丁二烯,可得顺式-1,4含量达90%以上的产物。活性范围为锂钛克分子此1.5—2.5。顺式-1,4含量随锂钛比增大而降低。本工作还比较了上述三种催化系统生成低价钛的情况。结果指出,在金属烷基物与四溴化钛的克分子比小于2时,三价钛均随克分子比增大而增大,克分子比大于2时,丁基锂的还原能力随克分子比增加而减少。在其他二种系统中则低价钛继续增加。有意义的是丁基锂-四溴化钛系统中聚合活性正好在三价钛最高?

This paper reports the mercury (Ⅱ) thiocyanate spectrophotometric method for the determination of micro amount of chlorine presented in the ammoniac catalyst and in the hydrogen-nitrogen mixture. The chlorine in the catalyst was separated in the form of hydrogen chloride by distillation and determined by spectrophotometry.The chlorine was determined in the.range from 10 to3000ppm. The chlorine in the hydrogen-nitrogen mixture is present both in the inorganic and organic forms.The total chlorine was determined...

This paper reports the mercury (Ⅱ) thiocyanate spectrophotometric method for the determination of micro amount of chlorine presented in the ammoniac catalyst and in the hydrogen-nitrogen mixture. The chlorine in the catalyst was separated in the form of hydrogen chloride by distillation and determined by spectrophotometry.The chlorine was determined in the.range from 10 to3000ppm. The chlorine in the hydrogen-nitrogen mixture is present both in the inorganic and organic forms.The total chlorine was determined by pyrolytic decomposition and reduction method.Organic chlorine was reduced by hydrogen to hydrogen chloride at 950℃ and determined by spectrophotometric method.Chlorine of 96% in the hydrogen-nitrogen mixture was recovered, if the chlorine presented was not less than 0.6mg/M~3.

本文报导了用硫氰酸汞分光光度法测定合成氨催化剂及氢—氮气中的微量氯。催化剂中的氯用蒸馏法以氯化氢的形式蒸出并用分光光度法进行测定,测定范围为10—3000ppm。氢—氮气中的氯为有机氯和无机氯两种,用高温裂解还原法在950℃高温区有机氯被还原成氯化氢,用分光光度法测定。氢—氮气中0.6毫克/立方米的氯回收率为96%。

When iron oxalate carried by active carbon was first reduced and then plated with metallic potassium, the ammonia synthesis catalyst thus formed exhibited especially high activity. After an intensive study of each component of the catalytic system, the following results have been obtained: Mossbauer spectrum revealed that the active site of the catalyst was composed of particulate α-iron having sizes around 100. The active centre was in the (111) plane of α-iron with seven atoms forming a Fe_2-cluster in which...

When iron oxalate carried by active carbon was first reduced and then plated with metallic potassium, the ammonia synthesis catalyst thus formed exhibited especially high activity. After an intensive study of each component of the catalytic system, the following results have been obtained: Mossbauer spectrum revealed that the active site of the catalyst was composed of particulate α-iron having sizes around 100. The active centre was in the (111) plane of α-iron with seven atoms forming a Fe_2-cluster in which aetivation of dinitrogen took place. EHMO method of calculation showed that Fe_2-cluster was the most efficient structure of iron catalyst to activate dinitrogen and it reduced the bond overlap population from 1.640 to 1.004, corresponding roughly to the reduction of the triple bond to a double boud. It was the π-bond greatly weakened while the σ-bond remained nearly the same. Metallic potassium in the catalyst formed potassium hydride with dihydrogen, it must first have activated dihydrogen. Results of SCCC method of calculation of FeH showed that H in the hydride bore a charge of 0.199 electron. Action of active carbon, the carrier, was independent of the degree of its graphitization, but dependent on its specific surface and distribution of its pore size. Pore size around 100was most suitable for the formation of the Fe_7-cluster. As to the other kinds of carriers, either because of too small bore size (e.g. molecular sieve) or because of oxygen constituent (e.g. SiO_2, Al_2O_3, etc.) were unfavorable for the formation or function of the Fe_7-cluster. Chlorideion was a poison for iron catalyst of ammonia synthesis because it caused the agglomeration of the superfine particlas of α-iron and hence destroyed the active site with the result of the loss of activity.

载于活性碳上的草酸铁还原后镀以金属钾所制成的合成氨铁催化剂表现特高的活性,经过对体系各组分的深入研究,我们获得以下的结果。

 
<< 更多相关文摘    
图标索引 相关查询

 


 
CNKI小工具
在英文学术搜索中查有关in the catalyst的内容
在知识搜索中查有关in the catalyst的内容
在数字搜索中查有关in the catalyst的内容
在概念知识元中查有关in the catalyst的内容
在学术趋势中查有关in the catalyst的内容
 
 

CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
版权图标  2008 CNKI-中国知网
京ICP证040431号 互联网出版许可证 新出网证(京)字008号
北京市公安局海淀分局 备案号:110 1081725
版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社