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dehydrogenation mechanism
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  脱氢机理
     The Quantum Chemical Treatment of the Dehydrogenation Mechanism on K-Promoted-Iron-Oxide Catalysts
     钾助催氧化铁催化剂对乙苯脱氢机理的量化处理
短句来源
     EMPLOYMENT OF SPIN TRAPPING TECHNIQUE ON THE STUDY OF PHOTOCATALYTIC DEHYDROGENATION MECHANISM OF ALCOHOL IN AQUEOUS SOLUTION
     自旋捕获技术用于脂肪醇水溶液的可见光催化脱氢机理的研究
短句来源
     For the oxygen-transfer dehydrogenation mechanism, the importance of electron transport between neighboring active-sites operating cooperatively in opposite phases of their redox cycles is pointed out.
     强调指出,晶格电子传递和邻近活性位氧化还原周期协同进行是氧转移脱氢机理的必要条件.
短句来源
     Propane dehydrogenation mechanism is preferred over H-(Ga)ZSM-5 zeolite that the primary role of Ga species in this model is hydride abstraction from the alkane to form the reactive carbenium ion and that Ga in the vicinity of the Bronsted acid site(framework gallium)can improve the selectivity of aromatics.
     H-Ga-Si上为丙烷脱氢机理,Ga脱去H+形成活泼正碳离子,同时由于骨架Ga与分子筛B酸位相邻,所以可提高芳烃选择性;
短句来源
  “dehydrogenation mechanism”译为未确定词的双语例句
     DFT Studies on Dehydrogenation Mechanism of Methane Activated by Gas-phase Niobium Cations
     Nb~+离子活化甲烷脱氢反应机理密度泛函(DFT)研究
短句来源
     A new reaction intermediate is detected byGC-MS and a new dehydrogenation mechanism is proposed.
     借助色谱-质谱技术,检测到一种新的反应中间物种,提出二聚物脱氢过程。
短句来源
     For the system adding TCNQ or NB, no hydrogen has been detected, probably due to the trapping of electron or H radical, and indicating that the dehydrogenation mechanism of aqueous ethanol solution catalyst upon irradiation was vis:
     在加入TCNQ或NB的体系中,由于其俘获了电子(e~-)或自由基,因而都未检测到氢气; 这说明在可见光照射下,Pt/CdS催化乙醇水溶液脱氢的机理是经由: H~++e~-→→1/2H_2
短句来源
     The dehydrogenation mechanism of ethanolamine on Raney Copper catalyst have been studied in this paper.
     探讨了以雷尼 (Raney) Cu为催化剂由一乙醇胺催化合成氨基乙酸钠反应的机理 ,推导了合成过程的动力学方程。
短句来源
     On metal active sites the dealkylation reaction follows adsorption and dehydrogenation mechanism, while on acid sites the dealkylation follows hydrogen transfer mechanism, carbonium ion chain reaction mechanism or free radical mechanism.
     在金属活性中心上,烷基芳烃遵循吸附脱氢的反应机理; 在酸性中心上可能遵循H转移、链式正碳离子以及自由基机理。
短句来源
  相似匹配句对
     The Mechanism of Lanthanum Dehydrogenation on Al-Alloy
     稀土镧对铝合金的去氢作用的机理分析
短句来源
     REACTION MECHANISM OF ETHANE OXIDATIVE DEHYDROGENATION
     负载型杂多酸上乙烷氧化脱氢反应途径
短句来源
     The mechanism has been designed.
     2.完成了系统机械结构的设计。
短句来源
     The reaction mechanism was.
     探讨了该反应的反应机理,推导出4-OH-TMP催化氧化动力学方程。
短句来源
     Dehydrogenation of Cyclohexane
     环己醇脱氢催化剂
短句来源
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  dehydrogenation mechanism
Furthermore, a very similar linear correlation between A and Ea known as "compensation effect" was obtained and a common dehydrogenation mechanism was considered for oxidative and nonoxidative conditions.
      
A possible successive dehydrogenation mechanism was proposed to explain the facts observed in this study.
      
The mechanism of C--H activation is a crucial question in the dehydrogenation mechanism.
      
The investigation of the dehydrogenation mechanism as a process for polymerisation during annealing is currently the subject of ongoing experiments.
      


The role of lattice oxygen in catalytic dehydrogcnation of ethylbenzene over industrial iron-oxide-based catalysts, 11 (Cr-consaining) and 210 (Cr-free), has been investigated by means of the following experiments: (1) Determination of amounts of H2O produced due to removal of lattice oxygen by reaction with ethyl-benzene used as the feed without addition of steam, and observation of gradual decay of catalytic activities, and changes in the X-ray powder-diffraction patterns of the used catalysts; (2) with elhylbcnzcne...

The role of lattice oxygen in catalytic dehydrogcnation of ethylbenzene over industrial iron-oxide-based catalysts, 11 (Cr-consaining) and 210 (Cr-free), has been investigated by means of the following experiments: (1) Determination of amounts of H2O produced due to removal of lattice oxygen by reaction with ethyl-benzene used as the feed without addition of steam, and observation of gradual decay of catalytic activities, and changes in the X-ray powder-diffraction patterns of the used catalysts; (2) with elhylbcnzcne plus D2O as the feed, determination of the change in D2/H2 ratio in the exit gas for very high and very low space velocities; and (3) vvith ethylbenzene plus D218O as the feed, observation of isotopic exchange of lattice 16O with steam 18O from the red shifts in the IR spectra of the used catalyst. The results indicate that direct heterolytic dehydrogenalion of ethylbenzene appcared to be the major rcction pathway, but a minor reaction pathway of cthyl-benzcne dehydiogenation by oxygen-transfer mechanism also appeared to make an appreciable contribution (about 20%) to the overall conversion. Mechanisms of these two reaction pathways are discussed. For the oxygen-transfer dehydrogenation mechanism, the importance of electron transport between neighboring active-sites operating cooperatively in opposite phases of their redox cycles is pointed out.

本文探讨了乙苯催化脱氢制苯乙烯工业氧化铁系催化剂晶格氧与水蒸汽氧的交换以及晶格氧参与反应的微观机理.实验结果表明:催化剂晶格氧参与反应,与水蒸汽氧有交换,反应途径以直接脱氢为主,并发生氧转移脱氢.讨论了两种脱氢反应途径中,晶格氧参与反应的微观过程.强调指出,晶格电子传递和邻近活性位氧化还原周期协同进行是氧转移脱氢机理的必要条件.

A noble metal and η-alumina are selected as active component and support res-pectively and hydroxide(A),carbonate(B)and sulfate(C)as co-catalysts for dehyd-rogenation of o-cyclohexylcyclohexanone to produce o-phenylphenol under atmosph-eric pressure.The dehydrogenating activity is correlated with the amount of activecomponent,the specific co-catalyst employed,metal surface area,as well as acidityand basicity on the catalyst surface.A new reaction intermediate is detected byGC-MS and a new dehydrogenation...

A noble metal and η-alumina are selected as active component and support res-pectively and hydroxide(A),carbonate(B)and sulfate(C)as co-catalysts for dehyd-rogenation of o-cyclohexylcyclohexanone to produce o-phenylphenol under atmosph-eric pressure.The dehydrogenating activity is correlated with the amount of activecomponent,the specific co-catalyst employed,metal surface area,as well as acidityand basicity on the catalyst surface.A new reaction intermediate is detected byGC-MS and a new dehydrogenation mechanism is proposed.

环己酮二聚物常压气相脱氢制邻苯基苯酚(OPP),贵金属为活性组份,η-Al_2O_3为载体,详细考察了不同活性组份含量及氢氧化物(A)、碳酸盐(B)和硫酸盐(C)分别作为助催化剂的反应结果。通过对催化剂金属表面积、表面酸度、碱度的测定,并与反应结果关联,明确了影响环己酮二聚物脱氢反应的因素。借助色谱-质谱技术,检测到一种新的反应中间物种,提出二聚物脱氢过程。

The roles of cerium in Fe-K-Ce mixed oxide catalysts were investigated. Cerium increases very obviously the activity of the catalysts with high content of potassium but only had a little influ ence on that of the catalysts with low content of potassium in the case of this work. No evident influence of cerium on the selectivity of these catalysts was observed. From XRD, XPS, EDAX. TEM and the activity tests of these catalysts, it was found that cerium nitrate is a better precursor of the cerium promoter than...

The roles of cerium in Fe-K-Ce mixed oxide catalysts were investigated. Cerium increases very obviously the activity of the catalysts with high content of potassium but only had a little influ ence on that of the catalysts with low content of potassium in the case of this work. No evident influence of cerium on the selectivity of these catalysts was observed. From XRD, XPS, EDAX. TEM and the activity tests of these catalysts, it was found that cerium nitrate is a better precursor of the cerium promoter than CeO2 because Ce promoter would be located on the surface of the catalysts as micro crystals when the nitrate is used to prepare the catalysts and it would tend to be covered by iron ox ide if the CeO2 is used. According to the viewpoints that K2Fe2O4 is the active phase of the potassium-promoted iron oxide catalysts and that both the direct catalytic dehydrogenation and the catalytic deby drogenation by oxygen-transfer pathway are included in the process of the dehydrogenation of ethyl benzene to styrene, it is suggested that although the K2Fe2O4 is a good active phase for the direct dehy drogenation, it is not a good one for the oxygen-transfer dehydrogenation because of the poor mobility of the lattice oxygen in the K2Fe2O4 and that the role of the Ce promoter is transforing oxygen from steam to the K2Fe2O4 and creating many active sites for the oxygen transfer dehydrogenation. There fore, the contribution of the oxygen-transfer dehydrogenation mechanism in the overall Eli dehydru genation and then the activity of the overall EB dehydrogenation arc increased. Our experimental re suits could be satisfactorily explained based upon these suggestions.

研究了铈在Fe_2O_3-K_2O-CeO_2乙苯脱氢催化剂中的助催化作用。铈源为硝酸铈时助催效果明显,但CeO_2则不佳。助催化效果还与催化剂中的钾量有关。铈明显增进高钾催化剂的活性,但对催化剂的选择性无明显影响。

 
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