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催化     
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  catalytic
    Study on Preparation and Catalytic Performances of Novel Nano-Porous Clay-Based Composite Materials
    新型纳孔粘土基复合材料的制备和催化性能研究
短句来源
    Study of Preparation of Nanoparticles for Catalytic Ecomaterials Using W/O Microemulsion
    W/O微乳液法制备环境催化材料纳米粒子的研究
短句来源
    SURFACE STATE AND CATALYTIC ACTIVITY OF ACTIVATED AMORPHOUS Fe_(80)Zr_(12)B_8 ALLOY
    活化非晶Fe_(80)Zr_(12)B_8合金的表面状态与催化活性
短句来源
    MICROSTRUCTURE AND CATALYTIC PROPERTIES OF RAPIDLY OUENCHED Ni-Al ALLOY
    急冷 Ni-Al 合金显微结构及催化性能
短句来源
    FORMATION AND CATALYTIC ACTIVITY OF NANOCRYSTALLINE Cu_(30)Al_(70) ALLOY CATALYST
    纳米晶Cu_30Al_70合金的形成及其催化活性
短句来源
更多       
  catalysis
    Catalysis and Surface Investigation of the Ni-Zr Amorphous alloys
    非晶Ni-Zr合金的催化活性及表面研究
短句来源
    MECHANICAL ALLOYING OF AMORPHOUS Ni_(50)Pd(40)Si(10) AND ITS ACTIVITY FOR HYDROGENATION CATALYSIS
    机械合金化非晶Ni_(50)Pd_(40)Si_(10)的形成及加氢催化活性
短句来源
    The ZCO powders with atom ratio Zn/(Zn+Ce)=0.2, prepared by inorganic polymer combustion route, were in the size of around 10nm. The UV-Vis spectra, UV irradiation catalysis and oxidation catalysis were evaluated experimentally. The results are compared with those of TiO2, ZnO and/or CeO2 powders.
    用无机聚合物凝胶燃烧法化学控制合成的纳米颗粒平均粒径约为10nm,原子比(Zn/(Zn+Ce))为0.2.实验评价了ZCO粉体的Uv-Vis光谱、紫外光光催化、氧化催化性能,并分别与TiO2、ZnO、CeO2进行了对比.
    PREPARATION OF NANOMETER SIZE α-Fe_2O_3 AND ITS CATALYSIS ON THE THERMAL DECOMPOSITION OF AMMONIUM PERCHLORATE
    纳米α-Fe_2O_3的制备及其催化高氯酸铵热分解
短句来源
    Surface treatment and catalysis of magnesium based hydrogen storage alloys
    镁基储氢合金的表面处理和表面催化
短句来源
更多       
  catalyst
    A New Application of Fullerene C_(60)/C_(70) to Polymerization of Butadiene with Neodymium Catalyst System
    C_(60)/C_(70)在钕系催化丁二烯聚合中的新应用
短句来源
    FORMATION AND CATALYTIC ACTIVITY OF NANOCRYSTALLINE Cu_(30)Al_(70) ALLOY CATALYST
    纳米晶Cu_30Al_70合金的形成及其催化活性
短句来源
    High-purity carbon nanotubes with diameters ranging from 30 nm to 40 nm were synthesized through catalytically pyrolizing water-free alcohol solution using N2 as carrier gas and ferrozen as catalyst.
    以N2作载气,二茂铁作催化剂,高温催化裂解无水乙醇溶液,制备出纯度较高,管径分布在30 nm~40 nm的纳米碳管。
短句来源
    Hydrogenation of Benzene by La_2Mg_(17) Based Metal Hydride as Catalyst
    La_2Mg_(17)金属氢化物催化苯加氢的研究
短句来源
    Preparation of Basic Mn_3O_4/Tm_2O_3 Nanoparticles and Effect of Catalyst
    碱型Mn_3O_4/Tm_2O_3复合纳米材料的制备及其催化性能
短句来源
更多       
  catalyse
    Fe, Co, Ni or Cu/SiO_2 composite aerogels can obviously catalyse carbon deposition of acetylene pyrogenation in chemical vapor depostion(CVD).
    Fe或Ni/SiO_2复合气凝胶可催化气相生长碳纤维。
短句来源
    After immobilization, the best pH、 temperature and Km of immobilized laccase catalyse ABTS were studied .
    固定化漆酶催化底物ABTS的最佳pH值为3、最佳温度为45℃、Km值比游离漆酶略有增大。
短句来源
    ZnS semiconductor nanoparticles have special properties in some fields such as photoelectricity, magnetism, catalyse and energetics and so on, which is closely related to their different structures and morphologies. So it is very necessary for the industrialization to prepare ZnS semiconductor nanoparticles with controllable particle size, shape and crystallinity and their assemble products.
    ZnS等半导体纳米粉末在光、电、磁、催化和力学等方面有着特殊的性能,这与其具有多种晶体形态和不同形貌紧密相关,而制备可控粒度、形状、取向的ZnS半导体纳米粉末,对材料付诸于工业应用具有十分重要的意义,同时也对湿法制备其它高附加值的粉末材料具有重要的指导作用。
短句来源
    (2 ) The study of laccase activity is an important part in the study of fiber optic biosensor based on enzyme catalyse reaction.
    (2)研究了血红密孔菌真菌漆酶的一般催化特性。
短句来源
    The material of enzymic protein was paid much attention, because it had high activated catalyse and specific selectivity.
    某些蛋白质如酶是生物催化剂,以其高效的催化效率和结构的特异选择性而受到广泛的关注,还有其他的生物材料虽然不属于酶,但是他们也表现出很好的酶类材料的特性,因此模拟酶和类酶材料的研究也得到了重视。
短句来源
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      catalytic
    Catalytic Synthesis of n-Butyraldehyde 1,2-propanediol Acetal over H4SiW12O40-PAn
          
    But when it was irradiated under UV illumination or solar irradiation for some time, the catalyst could be reused without loss of catalytic activity.
          
    Its catalytic performance was evaluated by liquid-phase hydrogenation of chloronitrobenzene (CNB).
          
    The results showed that the catalyst had higher catalytic performance than common hydrogenation catalysts.
          
    X-ray diffraction and selected area electron diffraction analysis showed that Pt-Sn-B/CNTs had an amorphous alloy structure that can improve catalytic performance.
          
    更多          
      catalysis
    Also, Lys residue and disulfide bands are necessary to protect the catalysis of the AKP.
          
    Dibenzothiophene (DBT) monooxygenase (DszC) catalysis, the first and also the key step in the microbial DBT desulfurization, is the conversion of DBT to DBT sulfone (DBTO2).
          
    Isolated Mn2O3 nanotubes and nanofibers were prepared very easily at a large scale with the liquid-phase catalysis method.
          
    Synthesis of a new iron(III) porphyrin acrylate-styrene copolymer and its catalysis for hydroxylation of cyclohexane
          
    The catalysis of chloridized metalloporphyrins in the oxidation of cyclohexane to adipic acid was systematically investigated.
          
    更多          
      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.
          
    更多          
      catalyse
    Proteases, also referred to as peptidases, are the enzymes that catalyse the hydrolysis of peptide bonds in polipeptides.
          
    The complexes of bis(imidazolyl)pyridine also catalyse the nitroaldol reaction, the yields being 64-90 %, but with zero enantioselective excess.
          
    As metallic elements were previously suspected to catalyse the reaction, a specially deactivated SPME needle was tested, but no significant difference was noticed compared to the original needle.
          
    The hydroxyl groups formed during partial esterification were found to catalyse the epoxy-anhydride reaction.
          
    In the context of the Callan-Rubakov effect, it is, in principle, possible for a gauged non-topological soliton (NTS) inside which a grand unified symmetry is realized to catalyse baryon decay.
          
    更多          


    A discussion on the catalytic action of clean surface of LaNi_5, by which the molecular hydrogen disassociated into atoms, is presented according to the study of the activation process kinetics of LaNi_5. It was confirmed that the catalytic action will be poisoned by oxygen on its surface. The activation process is removal of the pollution by oxygen and thereby forms a clean surface. How the incubation period come into existence is due to the surface pollution. The unreleased hydrogen stored in activated LaNi_5...

    A discussion on the catalytic action of clean surface of LaNi_5, by which the molecular hydrogen disassociated into atoms, is presented according to the study of the activation process kinetics of LaNi_5. It was confirmed that the catalytic action will be poisoned by oxygen on its surface. The activation process is removal of the pollution by oxygen and thereby forms a clean surface. How the incubation period come into existence is due to the surface pollution. The unreleased hydrogen stored in activated LaNi_5 can relieve the influence of oxygen upon the surface activity of it.

    本文通过对LaNi_5活化过程动力学的研究,论证了LaNi_5的清洁表面具有使氢分子分解为氢原子的催化作用。这种催化作用因氧在表面的存在而丧失,活化过程就是清除氧的污染而形成清洁表面的过程。孕育期的存在是表面污染引起的,已活化的LaNi_5中未释放的氢可减轻氧对LaNi_5表面活性的影响。

    The relationship between a catalytic oxidation of 2-propanol over the surlace of activated MgO and the crystal growth/sinter- ing behavior of the latter are investigated.The MgO sample in powder form under investigation was activated by calcinating Mg(OH)_2 at 500℃ for 90 minutes.This was then divided into two portions.TO one portion isopropyl alcohol was added while the other one was not.Both portions were heated at 130℃,230℃,350℃ and 700℃ tespectively for 70 minutes.The crystal size was determined by x-ray...

    The relationship between a catalytic oxidation of 2-propanol over the surlace of activated MgO and the crystal growth/sinter- ing behavior of the latter are investigated.The MgO sample in powder form under investigation was activated by calcinating Mg(OH)_2 at 500℃ for 90 minutes.This was then divided into two portions.TO one portion isopropyl alcohol was added while the other one was not.Both portions were heated at 130℃,230℃,350℃ and 700℃ tespectively for 70 minutes.The crystal size was determined by x-ray broadening method.It was found,after the treatment at 350℃,that the portion to which isopropyl alcohol was added brought about crystals with greater grain size than the portion to which nothing was added.Transmission electron microscopy confirmed the size mentioned above.In the course of the norisothermal growth of the isopropyl alcohol treated sample,it was observed that a significant high rate of grain growth occurred in the temperature interval of 300-400℃, where a concave endothermic,section appeared clearly on the DTA curve.The size of the grain fourid in the sintered mass of the isopropyl alcohol treated through microscopy mas greater than that of the untreated.A possible mechanism was proposed in the light of the catalytic theory,viz the oxidation of isopoopyl alcohol over the surface of MgO formed.-OH radicals.The desorption of the -OH radicals from the surface of MgO either resulted in vacancies originally occupied by oxygen or formed the“oxygen bridges”.

    本文研究了在活性 MgO 上进行的异丙醇的催化氧化反应和其晶粒长大及烧结的关系。把异丙醇加到由 Mg(OH)_2经500℃煅烧90min 得到的活性 MgO 中,并和未加异丙醇的试样同时在130℃、230℃、350℃和700℃等温度下再热处理70min。用 X 射线宽化法测定晶粒尺寸,发现在350℃热处理以后,加异丙醇的试样的晶粒尺寸比未加异丙醇的大。透射电镜观察亦得相同的结果。在加异丙醇的试样的非等温粒长大过程中,发现在300~400℃的温度范围内晶粒长大速度特别快。同时此温度范围内有一明显的吸热谷出现在差热曲线上。显微镜测得加异丙醇的烧结块的晶粒尺寸比未加的大。根据催化理论提出了一个可能的机理,即在 MgO 表面上进行的异丙醇的氧化反应产生-OH 根。当这些-OH 从 MgO 表面上脱附时产生氧空位或者形成“氧桥”。

    This article is a brief summary of our study on poisoning and regenerating at the surface of LaNi5 by impurities, which are H2S, SO2 and CS2 contained in the hydrogen used. The AES, XPS analysises show that the feature of the poisoning for three sulfides are different: LaNi5 poisoned by H2S produces the surface compounds, such as La2S3 and NiS. The chemisorption and physisorption occured due to SO2 and CS2 poisoning respectively.

    本文概括了氢气中的硫化物(如H_2S,SO_2和CS_2)对LaNi_5的表面中毒和再生。 AES,XPS的分析表明,三种硫化物的中毒性质不同:H_2S中毒产生La_2S_3和NiS这样的表面化合物;SO_2和CS_2中毒分别发生化学吸附和物理吸附。此外,从Ni(2P_(3/2))谱峰强度变化,表明了在LaNi_5表面上活性镍的表面催化性质。纯氢循环法再生CS_2和SO_2中毒是有效的,但对H_2S中毒无效。试验结果对解释稀土金属间氢化物的表面中毒机理和再生机理非常有用。

     
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