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噻吩加氢
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  hydrogenation of thiophene
     The influence of temperature on hydrogenation of thiophene under isothermal condition was simulated,and a simulation was then made for the second stage reactor from actual temperature profiles in the catalyst bed.
     研究了等温条件下温度对噻吩加氢的影响,并对二段反应器中实际温度的测定曲线进行了模拟比较。
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  “噻吩加氢”译为未确定词的双语例句
     There is an abrupt junction at about 270℃ for the adsorption rate, ka, of thiophene hydrogenolysis. These results show that the adsorption and surface reaction rates can be estimated separately without the assumption of a single rate controlling step, thus, it is possible to probe deeply into the essence of the dynamic features and the mechanism of catalytic reaction.
     噻吩加氢的吸附速率在约270℃时有一转折,结果表明,不需假设单一速率控制步骤即可分别地测定吸附和表面反应速率,从而对催化反应的动力学特性和反应机理有可能作较深人的了解。
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  相似匹配句对
     Catalytic hydrogenation of pyrrole, furan and thiophene was investigated.
     考察了常温常压下吡咯、呋喃和噻吩的催化加氢反应 ;
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     The Effects of Support and Promoter on Thiophene Hydrodesulfurization and Tetralin Hydrogenation
     噻吩加氢脱硫和四氢萘催化加氢反应中载体和助剂的影响
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     Hydrogenation of Polymer Containing Polydiolefin Units
     不饱和聚合物的加氢
短句来源
     ELECTROLYTIC HYDROGENATION OF ANTHRACENE
     蒽的电化学加氢
短句来源
     Thiophene and Its Derivatives
     噻吩及其衍生物
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  hydrogenation of thiophene
Kinetic Study of Catalytic Hydrogenation of Thiophene on a Palladium Sulfide Catalyst
      
Catalytic hydrogenation of thiophene to tetrahydrothiophene on various nickel-zeolite catalysts
      
Catalytic Hydrogenation of Thiophene to Thiolane in the Gas Phase
      
Hydrogenation of thiophene catalyzed by the metal complex of pd with alizarin S applied on γ-Al2O3 and rhenium sulfide
      
1.The metal complex of Pd with alizarin S applied on γ-A12O3 solvents catalyzes hydrogenation of thiophene into thiophane, and the yield of thiophane is comparable to the yield on Pd/Al2O3.
      
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The appearent kinetics of the hydrodesulfurization of thiophene in the hydrogendodecane-thiophene-catalyst system was studied with a resonant tube bomb reactor under hydrogen pressure of 40-150 Kg/cm~2. The catalysts used in this investigation are a kind of commercial catalyst——3665(NiMo/Al_2O_3) and several iron catalysts Under the above conditions and at temperature of 245—300℃ and with catalyst less than 0.5mm in diameter, the intrinsic kinetics (without the effect of diffusion) is as follows: the reaction...

The appearent kinetics of the hydrodesulfurization of thiophene in the hydrogendodecane-thiophene-catalyst system was studied with a resonant tube bomb reactor under hydrogen pressure of 40-150 Kg/cm~2. The catalysts used in this investigation are a kind of commercial catalyst——3665(NiMo/Al_2O_3) and several iron catalysts Under the above conditions and at temperature of 245—300℃ and with catalyst less than 0.5mm in diameter, the intrinsic kinetics (without the effect of diffusion) is as follows: the reaction is first order with respect to both hydrogen and thiophene, at 267℃ the reaction rate is r=k'P_HC_(TP), k'=1.12×10~(-4)(min~(-1). atm~(-1)) (on NiMo/Al_2O_3); the activation energy is 24700 cal/mole When the granularity is larger than 0.5 mm, the effeciveness η decreases due to increase of intraparticle diffusion. When the catalyst loading m is less than 0.2g, the appearent kinetic rate constant k is proportional to m, when m is greater than 0.2 g, its increase tends to slow down The catalytic activities of several binary or trinary iron catalysts were explored It was found that their activities is much lower than that of NiMo/Al_2O_3, and the order of their activities is. Fe(OH)_3+MoO_3+S>Fe(OH)_3+NiO+S>Fe(OH)_3+S>Fe(OH)_3+CuO+S. The role of tetralin, when it replaced dodecane partially, was observed. It was found that on both NiMo/Al_2O_3 and iron catalysts the existence of tetralin makes the conversion of thiophene decline, i.e. under these conditions tetralin has no hydrogen transferring power.

在40~150Kg/cm~2氢压下用管弹式谐振式反应器研究了氢-噻吩十二烷-催化剂体系三相床中催化加氢脱硫反应的形式动力学。在245~300℃范围内用小于0.5mm粒径的催化剂得到了消除外扩散及内扩散影响的动力学关系为:反应速率r=k′P_HC_(TP),k′=1.12×10~(-4)(分~(-1),大气压~(-1))(267℃,NiMo/Al_2O_3);上述条件下活化能为24700卡/克分子;当催化剂粒度大于0.5mm时内扩散影响加大使颗粒有效系数η下降。用四氢萘部分代替十二烷的作用,发现无论是在NiMo/Al_2O_3还是在铁系催化剂上都使噻吩的加氢脱硫转化率下降,即在此条件下四氢萘没有供氢作用。

The precursors of the industrial Fe-Mo/Al2O3 hydrodesulfurization (HDS) catalyst, i. e. the precipitates prepared from ferrous sulfate and ammonium molybdate by the coprecipitation method without supported on alumina were characterized by the magnetic measurement and identified by XRD method. The catalytic activity of the samples for the HDS of thiophene at 380C was measured in a continuous flow type micro-reactor. The results are as follows:(1) The phase component of the precursor is dependent on its atomic...

The precursors of the industrial Fe-Mo/Al2O3 hydrodesulfurization (HDS) catalyst, i. e. the precipitates prepared from ferrous sulfate and ammonium molybdate by the coprecipitation method without supported on alumina were characterized by the magnetic measurement and identified by XRD method. The catalytic activity of the samples for the HDS of thiophene at 380C was measured in a continuous flow type micro-reactor. The results are as follows:(1) The phase component of the precursor is dependent on its atomic ratio of Fe/Mo. When Fe/Mo<1.5,Fe2(MoO4)3 is the principal component, with a negative Weiss constant, -53K, which implies there occurred antiferroparamagnetic interaction between neighbouring Fe3+. When Fe/Mo= 1.5 -3.1, the samples reveal superparamagnetism for which the highly dispersed antiferromagnetic component a-FeOOH is responsible. Owing to the high dispersivity of a-FeOOH as formed in the coprecipitation process, the component Fe2(MoO4)3 formed in the same process is accordingly also highly dispersed. The average particle size evaluated by Langevin function and the low field magnetization versus H/T plots for the superparamagnetic component is about 110A-(2) As a consequence of the difference in phase components and their different dispersivity, the catalytic activity for HDS of thiophene is found to be affected by both of the surface area and Mo content of the samples. When Fe/Mo=1.5, there appears a maximum activity which is explained as the mutual effects of the surface area and the Mo content of the samples.(3) The effects of aging and calcination on the activity of the samples are also examined. Under optimum conditions, the coprecipitation process may result in a highly dispersed Fe-Mo precursor available to the Fe-Mo/Al2O3 catalyst.

应用Faraday式磁天平,辅以XRD和活性测试,研究了Fe-Mo/Al_2O_3加氢脱硫催化剂基体的磁学性质、物相、和活性之间的关系。发现样品中的Fe/Mo原子比对催化剂的物相有重要影响。当Fe/Mo值为0.36—0.86时,主要物相为Fe_2(MoO_4)_3,其Weiss常数为负值(θ=-53K),说明子晶格之间存在着反铁磁相互作用。当Fe/Mo值为1.5—3.1时,样品显示超顺磁性,这是由于过量的Fe在共沉淀时生成单独的物相α-FeOOH,并以极微细的颗粒存在,由于它的高度分散,致使样品中的Fe_2(MoO_4)_3也随之分散。自低磁场下的Langevin函数求得超顺磁性颗粒的大小约为110埃。样品的比表面随Fe/Mo值的增大而增加;对噻吩加氢脱硫的表观催化活性则在Fe/Mo=1.5左右时出现最大值。

Fe-Mo/Al2O3 catalyst prepared by coprecipitation method is examined for hydrodesulfurization(HDS) of organic sulfur compounds. The results obtained by the magnetic and Mossbauer spectroscopic methods reveal that the paramagnetic iron molybdate and the superparamagnetic a-FeOOH are the principal components originated from iron in this catalyst sample. In this paper, the fresh and the sulfided catalyst samples are characterized by the Mossbauer spectroscopy.For the fresh δFe-Mo/Al2O3 catalysts of various atomic...

Fe-Mo/Al2O3 catalyst prepared by coprecipitation method is examined for hydrodesulfurization(HDS) of organic sulfur compounds. The results obtained by the magnetic and Mossbauer spectroscopic methods reveal that the paramagnetic iron molybdate and the superparamagnetic a-FeOOH are the principal components originated from iron in this catalyst sample. In this paper, the fresh and the sulfided catalyst samples are characterized by the Mossbauer spectroscopy.For the fresh δFe-Mo/Al2O3 catalysts of various atomic ratios of Fe/Mo, the Mossbauer spectra display an overlapped spectra of at least two sets of double lines, one of which with Fe=0.40mm/s and △= 0.20 mm/s and another with Fe=G.35mm/s and △= 0.82mm/s. The former is due to the presence of δFe2(MoO4)3 and the latter of a-FeOOH. For the sulfided catalyst samples, the multiple six lines spectra of Fe1-xS are overlapped of another double line with Fe=0.35mm/s and △=0.78 mm/s in the middle part of the Mossbauer spectrum. In virtue of this double line appeared only if Mo presented in the catalyst sample and accompanied with appreciable HDS catalytic activity for thiophene, it is reasonable to conclude that a phase composed of Fe, Mo, and S behaves as the active phase, i. e. (Fe-Mo-S) phase. Since the atomic ratio of Mo/Fe for most samples is much lower than that for Fe2(MoO4)3, it is assumed that nearly the whole amount of Mo is in the (Fe-Mo-S) phase and the evaluated values for (Fe/Mo)a inside the active phase are not constant.The relationship between the catalytic activity of HDS of Fe-Mo/ A12O3 catalyst and the atomic ratio of Fe/Mo as well as the support content is discussed on the basis of the experimental results. A probable model for the active (Fe-Mo-S) phase is proposed.

对氧化态和硫化态的Fe-Mo/Al_2O_3加氢脱硫催化剂进行了Mossbauer谱学的研究。催化剂样品主要含有Fe_2(MoO_4)_3和α-FeOOH。负载于γ-AlOOH后,Mossbauer谱产生明显变化。硫化后,得到Fe_(1-x)S的磁分裂谱,并在中间部分叠加了一个δ=0.35mm/s,△=0.78mm/s的双峰。由于这组双峰的出现是以Mo的存在为条件,并伴随着噻吩加氢脱硫明显的催化活性的出现,故说明存在着(Fe-Mo-S)活性相。

 
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