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transfer dehydrogenation
相关语句
  转移脱氢
     Transfer Dehydrogenation of Alcohols over Ceria-Supported Cu, Ir, and Pd Catalysts
     CeO_2负载的Cu,Ir和Pd催化剂上的醇转移脱氢反应
短句来源
     Ceria-supported Cu, Ir, and Pd catalysts showed quite promising activity for transfer dehydrogenation of cyclohexanol and 2-octanol to cyclohexanone and 2-octanone, respectively, using styrene as the hydrogen acceptor.
     研究了CeO2负载的Cu,Ir和Pd催化剂上的醇转移脱氢反应.
短句来源
  “transfer dehydrogenation”译为未确定词的双语例句
     unsaturated hydrazide compounds obtained by the condensation of cinnamoyl chloride and substituted phenylhydrazine, eight new aryl substituted acyl azo compounds were synthesized in high yield under mild condition using 4.hydroxy 2,2,6,6,. tetramethyl. 1.piperidinyloxyl or Galvinoxyl free radical as a phase transfer dehydrogenation catalyst.
     由 β-苯丙烯酰氯与取代苯肼的缩合反应合成了芳基取代的 α,β-不饱和酰肼化合物 ,进而利用相转移催化剂 4-羟基 - 2 ,2 ,6 ,6 -四甲基 - 1 -哌啶基氧自由基以及 Galvinoxyl自由基对其进行了相转移催化脱氢 ,合成了 8种芳基取代的 α,β-不饱和酰基偶氮新型化合物 ,其结构经元素分析、IR和 1 H NMR证实。
短句来源
  相似匹配句对
     THERMODYNAMIC AND HYDROGEN TRANSFER STUDIES OF INORGANIC MEMBRANE FOR DEHYDROGENATION
     无机膜用于脱氢反应的热力学与传递过程研究
短句来源
     TECHNOLOGY TRANSFER
     山东省高新技术转移中心推荐项目
短句来源
     On Pragmatic Transfer
     语用迁移性之探讨
短句来源
     Dehydrogenation of Cyclohexane
     环己醇脱氢催化剂
短句来源
     Transfer Dehydrogenation of Alcohols over Ceria-Supported Cu, Ir, and Pd Catalysts
     CeO_2负载的Cu,Ir和Pd催化剂上的醇转移脱氢反应
短句来源
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  transfer dehydrogenation
Ru/Al2O3-catalyzed transfer dehydrogenation of alcohols
      


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.

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。

The role of lattice oxygen and potassium in iron-oxide-based catalysts (Fe_2O_3, Fe_2O)3-K)2O and commercial XH-0 3 ) has been investigated by using TPR(temperature programmed reduction), XPS, high temperature XRD and determination of activity and specific surface area, The high temperature XRD study of the K-promoted iron-oxide catalyst has been shown to have the formation of new crystalline phase of K_2Fe_2O_4, which promoted the reaction activity. The reduction levels of lattice oxygen are considerably...

The role of lattice oxygen and potassium in iron-oxide-based catalysts (Fe_2O_3, Fe_2O)3-K)2O and commercial XH-0 3 ) has been investigated by using TPR(temperature programmed reduction), XPS, high temperature XRD and determination of activity and specific surface area, The high temperature XRD study of the K-promoted iron-oxide catalyst has been shown to have the formation of new crystalline phase of K_2Fe_2O_4, which promoted the reaction activity. The reduction levels of lattice oxygen are considerably different at the surface of Fe_2O_3 catalyst before and after the reaction. The lattice oxygen was found to lose easily and resulted in deficiency of oxygen, which brought about the deactivation of the catalyst on the unpromoted Fe_2O_3 catalyst. At the surface of K-promoted catalyst, it has an increase in quantity and stability of lattice oxygen and , consequently , increases the activity of the direct heterolytic dehydrogenation and oxygen-transfer dehydrogenation of ethylbenzene. The role of K is to stabilize the interconversion between Fe ̄(2+) and Fe ̄(3+) and to improve the electron transport between the neighboring active-sites, subseqently promoted the dehydrogenation and the selfregeneration. In this paper, the active phase of the catalyst is suggested to be K_2Fe2O_4 and the active center ofdehydrogenation to be consisted of Fe ̄(2+), Fe ̄(3+), lattice oxygen at certain reduction level and K ̄+.

采用程序升温还原反应(TPR)、XPS、高温真空XRD及活性和比表面测定等方法对单组分Fe_2O_3、双组分Fe_2O_3-K_2O催化剂及工业用XH-03催化剂研究晶格氧的性质和钾的助催作用;结果表明,纯Fe_2O_3催化剂表面氧种的还原程度差别较大,反应时晶格氧易于失去,造成缺氧而迅速失活,钾的加入使催化剂生成新的K_2F_e2O_4相,其表面氧种的还原性趋向一定的温度范围,晶格氧数量增加,且其稳定性也增加,从而同时促进了氧转移脱氢和直接脱氢反应的活性,因此认为K_2Fe_2O_4可能是活性相,脱氢反应的活性中心应由Fe~(2+)、Fe~(3+)、还原程度一定的晶格氧和K~+组成。

 
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