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catalyst
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  催化剂
    A New Structured Vanadium Catalyst and Its Design, Manufacture and Tests
    新型整体式钒催化剂的设计、制备与研究
短句来源
    KINETIC STUDIES ON THE OXIDATION OF SULFUR DIOXIDE ON VANADIUM CATALYST——I. Rate Equations with Yung-lee Catalyst
    二氧化硫在钒催化剂上氧化动力学的研究——Ⅰ.永利钒催化剂的动力学方程式
短句来源
    The Influence of the Size of A Catalyst on the Behavior of Bubbles
    从气泡的行为看催化剂粒度对流态化质量的影响
短句来源
    Determination of Tortuosity for Z-type Natural Gas Steam Reforming Catalyst
    Z型天然气蒸汽转化催化剂弯曲因子的测定
短句来源
    Multicomponent Diffusion Model for Effectiveness Factor of Ammonia Synthesis Catalyst
    氨合成催化剂内表面利用率的多组分扩散模型
短句来源
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  催化
    Soft Chemical Synhesis, Cutting and Catalyst Behavior of Carbon Nanotubes Based on the "C-H-O" System
    基于“C-H-O”体系软化学的碳纳米管的合成、剪裁与催化特性
短句来源
    Study on the Preparation of Carbon Nanotubes and the Catalytic Properties over CNTs Supported NiB Amorphous Alloy Catalyst
    碳纳米管的制备及负载非晶态NiB合金的催化性能的研究
短句来源
    γ-IRRADIATION EFFECTS ON CATALYLIC ACTIVITY OF LaCoO_3 CATALYST
    γ射线辐照对钙钛矿型LaCoO_3催化剂材料催化氧化CO活性的影响
短句来源
    Reliability of Gas-solid Catalytic Reactor and Catalyst
    气固催化反应器及催化剂的可靠性
短句来源
    Development of Mini-type Automatic FCC Catalyst Feeder
    催化裂化催化剂小型自动加料器
短句来源
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  触媒
    ACTING MECHANISM OF THE CATALYST MATERIAL IN DIAMOND SYNTHESIS
    人造金刚石触媒材料的作用机构
短句来源
    A STUDY ON 86-8 NEW CATALYST FOR DIAMOND SYNTHESIS
    86-8~#新触媒的研制
短句来源
    STUDIES ON REGENERATED CATALYST OF ELECTRODEPOSITION AND DIAMOND SYNTHESIS
    电沉积再生触媒及金刚石合成的研究
短句来源
    Effect of Boronized Catalyst Alloy on Properties of Synthetic Diamond
    触媒合金渗硼对合成人造金刚石性能的影响
短句来源
    RESEARCH ON EXTRACTION NOBLE METAL FROM WASTE CATALYST CONTAINING MOLYBDENUM
    从含钼废触媒中提取贵金属的研究
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  “catalyst”译为未确定词的双语例句
    The Determination of the Reaction Rate Constants of CO_2 Absorbed in Carbonate Buffer Solutions with AsO_2~- or ClO~- as Catalyst
    碳酸盐缓冲溶液吸收CO_2时催化反应动力学常数的测定
短句来源
    A STUDY ON THE ADSORPTION PROPERTIES OF CO AND CO_2 OVER CROMIA-PROMOTED MAGNETITE SHIFT CATALYST
    (Fe,Cr)_3O_4上CO、CO_2吸附性能的研究
短句来源
    OPTIMAL ACTIVITY DISTRIBUTION AIMED AT MAXIMIZING THE SELECTIVITY OF ISOTHERMAL CATALYST PELLETS FOR PARALLEL-CONSECUTIVE REACTION NETWORK
    以选择性为目标的最优活性分布:平行—连串反应网络
短句来源
    OPTIMIZATION DESIGN OF BIS-PHENOL-A SYNTHETIC REACTOR WITH RESIN AS CATALYST
    树脂法合成双酚A反应器的优化设计
短句来源
    ON COMPUTER-AIDED CATALYST PELLET DESIGN
    计算机辅助催化剂颗粒级设计的研究
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  catalyst
A new environmentally friendly catalyst, H4SiW12O40-polyaniline (PAn), was prepared, and n-butyraldehyde 1,2-propanediol acetal was synthesized from n-butyraldehyde and 1,2-propanediol in the presence of H4SiW12O40-PAn.
      
The influence factors of the synthesis were discussed, and the best reaction conditions were found: the molar ratio of n-butyraldehyde to 1,2-propanediol is 1:1.5, the amount of catalyst used is 1.2% of feed stock, and the reaction time is 1.0 h.
      
H4SiW12O40-PAn is an excellent catalyst for synthesizing n-butyraldehyde 1,2-propanediol acetal, and the yield can reach more than 95.2%.
      
The partial intermediate products were absorbed on TiO2 surface, which resulted in catalyst deactivation.
      
But when it was irradiated under UV illumination or solar irradiation for some time, the catalyst could be reused without loss of catalytic activity.
      
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The formation of divacancies in MgO, their amount, the influence from dopant andthe influence on sintering were studied. There are many arrangements of the □Mg~(2+) and □o~(2-) in MgO. By some arrangementsdivacancy will not be formed.The probability is less than one. The concentration of diva-cancies formed at 1,800℃ is estimated as less than 10~(-5). When MgO is doped with Fe_2O_3, the concentration of divacancies is increased, andthere are two mechanisms of the formation of divacancies. The dopant Fe_2O_3...

The formation of divacancies in MgO, their amount, the influence from dopant andthe influence on sintering were studied. There are many arrangements of the □Mg~(2+) and □o~(2-) in MgO. By some arrangementsdivacancy will not be formed.The probability is less than one. The concentration of diva-cancies formed at 1,800℃ is estimated as less than 10~(-5). When MgO is doped with Fe_2O_3, the concentration of divacancies is increased, andthere are two mechanisms of the formation of divacancies. The dopant Fe_2O_3 in MgO will generate valence-differed vacancies which increase theprobability of formation of divacancies, but not effective. For instance, when MgO isdoped with 1.2~1.4% Fe_2O_3, the concentration of valence-differed vacancy is only 8%of the thermal equilibrium vacancies by 1,800℃. Fe~(3+) is more effective. In absence of □o~(2-), Fe~(3+) will first combine with □Mg~(2+) to formthe complex (Fe~(3+)-3/2□Mg~(2+)). The complex diffuses easily. When the complex meets□o~(2-), it will give out the □Mg~(2+). The □Mg~(2+) combines with □o~(2-) and forms divacancy.Fe~(3+) is left and diffuses. When Fe~(3+) meets □Mg~(2+), then the complex is formed again.When the complex meets □o~(2-), it gives out □Mg~(2+) again, and the divacancy is formedagain。This cycle will be repeated again and again, until the majority or the whole of thethermal equilibrium vacancies form divacancies. Fe~(3+) acts as a catalyst. If the magnesite is fired to 1,820℃, the specific gravity will be decreased by 0.017~0.077 in comparison with the maximum specific gravity. The decreament is correspondingto the divacancies with the concentration of 10~(-3)~10~(-2), near the concentration of divacan-cies(10~(-2.5)) formed from the whole thermal equilibrium vacancles at 1,800℃. With the magnesite containing 93%MgO, 1.5%Fe_2O_3, fired at 1,800℃, to make magne-site brick, fired at 1,600℃, the apparent porosity is 0%~2%. The high sinterability is dueto divacancies. With the aid of the theory of divacancies, the reason of the accelerating effect ofFe_2O_3 to the sintering of MgO brick and the reason of non-accelerating effect when theFe_2O_3 is added to the batch are interpreted.

研究了MgO中双空位的生成、生成量,溶质对双空位生成量及对烧结的影响。 MgO中Mg~(2+)空位及O~(2-)空位相互间有种种排列方法。有些排列方法不能生成双空位。生成双空位的几率小于一.经计算,得知在1800℃生成双空位的浓度在10~(-5)以下。 在MgO内加入Fe_2O_3后,经由二种机理,双空位浓度大增。 Fe_2O_3溶入MgO后,发生价差空位。价差空位可提高双空位生成的几率,但效果不大。以1.2~1.4% Fe_2O_3溶于MgO而论,在1800℃价差空位浓度只有热平衡空位之8%。不能提高双空位生成几率甚多。 发生最大作用者为Fe~(3+)先是Fe~(3+)与□_Mg~(2+)生成复合体(Fe~(3+)-3/2□_Mg~(2+))。这个复合体扩散甚易。当它与□o~(2-)接触时,放出□_Mg~(2+),□_Mg~(2+)o~(2-)生成双空位。剩下的Fe~(3+)扩散,与□_Mg~(2+)接触,又生成复合体。复合体再扩散,再与□o~(2-)接触,再放出□_Mg~(2+),再生成双空位。如此循环不已,可将大部分以至全部热平衡空位生成双空位。Fe~(3+)实际上是个触媒。在1820℃烧成的镁砂比重降...

研究了MgO中双空位的生成、生成量,溶质对双空位生成量及对烧结的影响。 MgO中Mg~(2+)空位及O~(2-)空位相互间有种种排列方法。有些排列方法不能生成双空位。生成双空位的几率小于一.经计算,得知在1800℃生成双空位的浓度在10~(-5)以下。 在MgO内加入Fe_2O_3后,经由二种机理,双空位浓度大增。 Fe_2O_3溶入MgO后,发生价差空位。价差空位可提高双空位生成的几率,但效果不大。以1.2~1.4% Fe_2O_3溶于MgO而论,在1800℃价差空位浓度只有热平衡空位之8%。不能提高双空位生成几率甚多。 发生最大作用者为Fe~(3+)先是Fe~(3+)与□_Mg~(2+)生成复合体(Fe~(3+)-3/2□_Mg~(2+))。这个复合体扩散甚易。当它与□o~(2-)接触时,放出□_Mg~(2+),□_Mg~(2+)o~(2-)生成双空位。剩下的Fe~(3+)扩散,与□_Mg~(2+)接触,又生成复合体。复合体再扩散,再与□o~(2-)接触,再放出□_Mg~(2+),再生成双空位。如此循环不已,可将大部分以至全部热平衡空位生成双空位。Fe~(3+)实际上是个触媒。在1820℃烧成的镁砂比重降低0.017~0.077。这一降低数相当具有浓度为 10~(-3)~10~(-2)的双空位,与1800℃热平衡空位完全生成双空位的浓度(10~(-2.5)近似。 用含Fe_2O_31.5%、MgO93%,在1800℃烧成的镁砂制砖,在1600℃烧成,显气孔率为0~2%。?

This paper describes the study of optimal discrimination in detail among rival models for the reaction of synthesis of ammonia on "A" catalysts. For this purpose the sequential procedure has been applied, the parameters in candidate models have been preliminarily estimated, and rival models have been screened with proposed criteria. The discrimination was achieved. One of the models was found superior to the others and was finally retained. This paper also deals with the selection of algorithms for least-squares...

This paper describes the study of optimal discrimination in detail among rival models for the reaction of synthesis of ammonia on "A" catalysts. For this purpose the sequential procedure has been applied, the parameters in candidate models have been preliminarily estimated, and rival models have been screened with proposed criteria. The discrimination was achieved. One of the models was found superior to the others and was finally retained. This paper also deals with the selection of algorithms for least-squares fitting, the details of technical matters in discrimination procedure and the criteria for identification of models.

本文详细讨论了用序贯法对“A”系催化剂上氨合成反应的速率模型最佳判别的过程;对不同速率模型中的参数进行初估,按设定的准则作序贯判别,最后选出优惠的模型方程。 文中还讨论了最小二乘法的选择;判别过程的具体技术问题及模型的判别准则。

Experiments on the dynamics of fast fluidization were carried out in a 100mm-diameter plexiglas column, 8 meters in height, on FCC catalyst, alumina powder, iron ore concentrate and fine pyrites cinder. Based on the rapid formation and dissolution of dense strands or clusters of solids dispersed in a continuum of dilute phase, a physical flow model of fast fluidization has been proposed leading to a first-order differatial equation, the solution of which yields a four-parameter equation of voidage distribution...

Experiments on the dynamics of fast fluidization were carried out in a 100mm-diameter plexiglas column, 8 meters in height, on FCC catalyst, alumina powder, iron ore concentrate and fine pyrites cinder. Based on the rapid formation and dissolution of dense strands or clusters of solids dispersed in a continuum of dilute phase, a physical flow model of fast fluidization has been proposed leading to a first-order differatial equation, the solution of which yields a four-parameter equation of voidage distribution along the bed height z

在外径100mm,高8m的有机玻璃的装置上,对FCC催化剂、三氧化二铝粉料、铁精矿和细粒黄铁矿烧渣进行了快速流态化的流动实验。基于分布在稀薄连续相中颗粒密集体的不断形成和解体的现象,提出了快速流态化的分相流动的物理模型,并用一个一阶微分方程加以描述。其解为 In((ε-ε_a)/(ε'-ε))=-(z-z_i)/Z_o 四个模型参数,即ε_a、ε'、Z_o、和z_i由实验确定。

 
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