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mn catalyst
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  mn催化剂
     Methanol synthesis from CO/CO_2 hydrogenation over Cu/Zn/Al/Mn catalyst
     Cu/Zn/Al/Mn催化剂上CO/CO_2加氢合成甲醇特性研究
短句来源
     Effect of CO on CO 2 hydrogenation to methanol over a Cu/Zn/Al/Mn catalyst
     Cu/Zn/Al/Mn催化剂上CO_2加氢合成甲醇的CO助催化作用
短句来源
     The effect of promoters La,V, Zn and K on the performance of the co-precipitated Fe/Mn catalyst for CO+H2 synthesis was studied under a medium pressure of 1.1 MPa by using a fixed-bed microreactor.
     用微型固定床反应器,在中压(1.1MPa)条件下考察了助剂La、V、Zn、K对共沉淀Fe-Mn催化剂CO+H2合成反应性能的影响。
短句来源
     By using Mossbauer Effect Spectroscopy(MES),the effect of promoters such as La,K,V,Zn on the phase composition of co-precipitated Fe/Mn catalyst after calcination,reduction and FT synthesis have been studied.
     用穆斯堡尔谱(MES),考察了助剂La、K、V、Zn对共沉淀Fe-Mn催化剂经焙烧、还原及F-T合成反应等不同过程后体相结构的影响。
短句来源
     The effects of reaction conditions on the performance of Fe Mn catalyst for F T synthesis during the middle and late period of the run process have been investigated in an integral fixed bed reactor.
     采用固定床积分反应器 ,详细考察了F T合成反应用Fe Mn催化剂运行 90 0和 180 0h后的中后期反应性能 .
短句来源
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  锰催化剂
     The results suggest that the activity of Cu Mn catalyst comes from the combination of CuO, manganese oxide and copper manganate, especially copper manganate acts main role on the catalytic reaction.
     结果表明 ,铜锰催化剂的活性源于氧化铜、氧化锰及锰酸铜之间的紧密结合 ,其中锰酸铜物相的存在对反应起着十分重要的作用 .
短句来源
  “mn catalyst”译为未确定词的双语例句
     The appropriate condition for CWO of 3-methylyridine pesticide wastewater over the Cu/Mn catalyst was as follows: temperature 190 ℃,pH of the wastewater 8.28,oxygen partial pressure 1.60 MPa,reaction time(120 min).
     通过对氧气分压、反应温度和废水pH等工艺条件的考察,催化湿式氧化法处理含3-甲基吡啶农药废水的适宜工艺条件为:190℃,氧分压1.60 MPa,pH=8.28。
短句来源
     The rednction,catalysis and bulk structure of the modified Mn catalyst are studied by H 2-TPR,and XRD and the target reaction of CO+H 2 synthesied to DME in slurry bed.
     通过H2 -TPR、XRD和目标反应浆态床CO +H2 合成二甲醚 ,对Mn改性催化剂的还原性能、体相结构和催化性能进行了研究。
短句来源
     Effect of promoters on the co-precipitated Fe/Mn catalyst for FT synthesis Ⅳ. study on performance of the catalysts for FT synthesis
     助剂对F-T合成Fe-Mn共沉淀催化剂的影响 Ⅳ.催化剂F-T合成反应性能的研究
短句来源
     The article introduces the preparation of modified Mn catalyst of CuZnAl and Mn/CuZnAl by co-precipitation and impregnation.
     用共沉淀法、浸渍法制备Mn改性催化剂CuZnAlMn和Mn/CuZnAl。
短句来源
     Studied E-t Graphs and Curves of Changing Concentrations in B-Z Reaction of Mn Catalyst
     锰离子催化B-Z反应的E-t图及浓度曲线
短句来源
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  mn catalyst
The catalyst prepared from hydrotalcite-like precursor, the mesoporous MSU-γ supported Mn catalyst and the Mn-incorporated MSU-γ catalyst are more active than conventional Mn/γ-Al2O3 catalyst.
      
Elimination of Carbon Monoxide in the Gas Streams by Dielectric Barrier Discharge Systems with Mn Catalyst
      
Effect of K-Mn Catalyst on accelerating the conversion of intermediate products in the process of paraffin oxidation to fatty ac
      
It is concluded that a K-Mn catalyst retards some oxidation stages and accelerates others.
      
It was found that Fe-Co-Mn has a better catalytic stability than the Fe-Mn catalyst.
      
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The reduction of unsupported Fe-Mn oxide and an activated carbon (AC) supported Fe-Mn catalyst in H_2 at different temperatures has been investigated with in situ Mossbauer spectroscopy. Before reduction, superparamagnetic α-(Fe_(1-x)Mn_x)_2O_3 and hydrated Fe-Mn oxide exist in the Fe-Mn/AC catalyst which is dried at 120℃. The reduction of iron species in the Fe-Mn catalyst is affected by interactions between iron and the AC support and between iron and manganese. The...

The reduction of unsupported Fe-Mn oxide and an activated carbon (AC) supported Fe-Mn catalyst in H_2 at different temperatures has been investigated with in situ Mossbauer spectroscopy. Before reduction, superparamagnetic α-(Fe_(1-x)Mn_x)_2O_3 and hydrated Fe-Mn oxide exist in the Fe-Mn/AC catalyst which is dried at 120℃. The reduction of iron species in the Fe-Mn catalyst is affected by interactions between iron and the AC support and between iron and manganese. The AC support stabilizes Fe~(3+) and retards the reduction nf Fe~(3+), whereas manganese promotes the reduction of Fe~(3+) to Fe~(2+) forming。FeO-MnO solid solution which is stableagainst further reduction to Fe°. So, even after reduction in H_2 at 500℃, there will still be some Fe~(3+) and Fe~(2+) unreduced in the 4%Mn-8%Fe/AC catalyst.

使用原位穆斯堡尔谱考察了非担载铁-锰氧化物和铁-锰/活性炭(Fe-Mn/AC)催化剂在不同温度下的还原。还原前Fe-Mn/AC催化剂中存在的为超顺磁α-(Fe_1-_xMn_x)_2O_3和没有充分脱水的铁-锰氧化物。铁的还原同时受铁-锰和铁-活性炭相互作用的影响,载体活性炭使F~(3+)相对稳定而难以还原,锰则促进铁还原到Fe~(2+)并形成相对稳定的FeO-MnO固溶体而难以还原到Fe~0。对4%Mn-8%Fe/AC催化剂,即使在500℃氢气中处理,仍有相当数量的Fe~(3+)和Fe~(2+)不能还原。

The ultrafine particle(UFP)Fe-Mn catalyst has been found to exhibit excellent performance for F-T synthesis. In the present work, the effects of the preparation method and pretreatment on the surface structure of K-promoted Fe-Mn UFP catalysts for F-T synthesis were studied by XPS. Under the treatment of syngas, pronounced enrichment in manganese and potassium on the surface of the catalysts, concomitant with the migration of manganese onto the surface, was observed. Appropriate enrichment...

The ultrafine particle(UFP)Fe-Mn catalyst has been found to exhibit excellent performance for F-T synthesis. In the present work, the effects of the preparation method and pretreatment on the surface structure of K-promoted Fe-Mn UFP catalysts for F-T synthesis were studied by XPS. Under the treatment of syngas, pronounced enrichment in manganese and potassium on the surface of the catalysts, concomitant with the migration of manganese onto the surface, was observed. Appropriate enrichment in manganese and potassium favors the selectivity for light olefins. Mixture of different species of iron (Fe3+ , Fe2+, Fe3O4, x-Fe5C2) and manganese (Mn3+ and Mn2+), depending on the reducibility of the catalyst, is formed on the surface of the reduced catalyst. The incorporation of manganese promotes the reduction and carburization of the surface iron species. Three carbon species, a hydrocarbon, a carbide and a graphitic ones, were identified on the surface of the catalysts under the exposure to syngas. The above characteristics of the catalysts are strongly affected by the preparation method and pretreatment of the catalysts, and thus lead to divergent F-T performance.

本工作利用XPS研究了用于F-T合成的加K助剂的Fe-Mn超细粒子催化剂的表面结构,考察了制备方法和预处理条件对催化剂表面结构的影响。在合成气处理条件下,伴随着Mn向表面迁移并产生富集。催化剂表面显著富K;适当的Mmt和富集有利于提高低碳烯烃选择性,同时活性不会明显降低。催化剂还原可以用“内还原模型”来描述,依还原程度不同。表面形成不同的Fe~3+、Fe~(?)、Fe_3O_4、x-Fe(?)C(?)、Mn~(3+)、Mn~(3+)的混合物,Mn的加入促进了表面铁物种的还原与碳化,合成气氛下,催化剂表面形成了三种不同的表面碳物种:烃类碳、石墨型碳(284.6eV)以及碳化物碳(283.2eV)。

Iron based ultrafine particle catalysts have been found to exhibit excellent performance for F-T synthesis.In this work, the effects of the second metal component and the catalyst composition on the structure and reduction behavior of K-promoted Fe-M ultrafine particle catalysts for F-T synthesis were studied by Mssbauer spectroscopy in combination with X-ray diffraction (XRD)techniques. It was found that the incorporation of a second metal component (Mn, Zn or Mg) into the catalyst...

Iron based ultrafine particle catalysts have been found to exhibit excellent performance for F-T synthesis.In this work, the effects of the second metal component and the catalyst composition on the structure and reduction behavior of K-promoted Fe-M ultrafine particle catalysts for F-T synthesis were studied by Mssbauer spectroscopy in combination with X-ray diffraction (XRD)techniques. It was found that the incorporation of a second metal component (Mn, Zn or Mg) into the catalyst makes the chemical environment around iron atoms markedly deviate from cubic symmetry, and also makes the particle size of ironcontaining phase in the catalyst even still smaller. "Pure" iron ultrafine particle catalyst can be easily reduced to zero-valent iron via Fe_3O_4. The incorporation of a second metal component hinders the reduction of iron-containing phase in the catalyst, and stabilizes divalent iron oxide as an intermediate in the reduction. This favors the formation of the active phase with spinel-like structure under typical F-T synthesis condition. For Fe-Mn catalysts, the effects are more pronounced with increasing Mn content.The reducibility of iron based ultrafine particle catalysts follows the order of "pure" Fe>Fe-Zn>Fe-Mn>Fe-Mg. This is, in certain extent, an indication of the interaction between iron and the second metal component.

铁基超细粒子催化剂具有优良的F-T反应性能。本工作利用原位Mssbauer谱辅以XRD技术研究了含有钾助剂的F-T合成铁基超细粒子催化剂的结构与还原行为,考察了催化剂组成和第二金属组分(Mn,Zn,Mg)的影响。“纯”铁超细粒子催化剂在氢气中很容易经Fe_3O_4还原为零价铁。第二金属组分的引入,一方面阻碍了催化剂的还原,另一方面稳定了Fe~(2+)的存在而使其成为还原的主要中间相,这有利于反应条件下形成类尖晶石结构的活性相。对于Fe-Mn催化剂,上述效应随锰含量的增加而更趋显著。铁基超细粒子催化剂在氢气中的还原能力依“纯”Fe>Fe-Zn>Fe-Mn>Fe-Mg的顺序递减,这在一定程度上反映了铁与第二金属组分之间相互作用的强弱。

 
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