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ultrafine mo-co-k catalyst
相关语句
  超细mo-co-k催化剂
     XPS Study of Ultrafine Mo-Co-K Catalyst for Synthesis of Lower Alcohols
     合成低碳醇用超细Mo-Co-K催化剂的XPS研究
短句来源
  相似匹配句对
     Mo;
     Mo ;
短句来源
     Mo.
     Mo、Co主要分布在籽粒中;
短句来源
     EFFECTS OF HEAT TREATMENT ON STRUCTURE AND PROPERTIES OF ULTRAFINE K-Co-Mo CATALYSTS
     不同热处理方式对超细粒子K-Co-Mo催化剂性能和结构的影响
短句来源
     XPS Study of Ultrafine Mo-Co-K Catalyst for Synthesis of Lower Alcohols
     合成低碳醇用超细Mo-Co-K催化剂的XPS研究
短句来源
     HIGHER ALCOHOL SYNTHESIS FROM SYNGAS OVER ULTRAFINE Mo-Co-K CATALYSTS
     超细Mo-Co-K催化剂合成低碳醇性能的研究
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A series of ultrafine Mo Co K catalyst samples with different Co/Mo ratios were investigated. The catalyst samples were characterized by XPS and the catalytic performance of the catalyst for synthesis of lower alcohols was investigated. The XPS results indicated that the molybdenum exists as Mo 6+ and (Mo 6+ +Mo 4+ ) in the unreduced and reduced catalyst, respectively, while the cobalt exists as Co 2+ in both unreduced and reduced catalyst. An interaction...

A series of ultrafine Mo Co K catalyst samples with different Co/Mo ratios were investigated. The catalyst samples were characterized by XPS and the catalytic performance of the catalyst for synthesis of lower alcohols was investigated. The XPS results indicated that the molybdenum exists as Mo 6+ and (Mo 6+ +Mo 4+ ) in the unreduced and reduced catalyst, respectively, while the cobalt exists as Co 2+ in both unreduced and reduced catalyst. An interaction between the Mo species and Co species exists in the catalyst. The XPS results revealed that the content of Mo 4+ species has a maximum value at n (Co)/ n (Mo)=0 13. A linear relation between the alcohol selectivity and the Mo 4+ content in the reduced catalyst leads to the conclusion that Mo 4+ species in the catalyst may be the active sites for synthesis of lower alcohols.

采用XPS技术对氧化态及还原态超细Mo Co K催化剂进行了研究 .结果表明 ,在氧化态超细Mo Co K催化剂中 ,钼和钴分别以Mo6 +和Co2 +物种存在 ,催化剂中各物种之间存在着相互作用 ;随着Co/Mo比的增大 ,还原态催化剂中Mo4+物种的含量逐渐增大并出现极大值 ;催化剂上合成低碳醇反应性能与其表面的Mo4+物种有关 .将催化剂表面的Mo4+物种含量与其合成低碳醇选择性进行关联 ,发现二者存在着很好的对应关系 .此外 ,对超细Mo Co K催化剂上合成低碳醇反应的活性中心进行了初步探讨

Ultrafine Mo-Co-K catalysts were prepared by the “gel-like” process, followed by the supercritical fluid drying (SCFD) technique Synthesis of higher alcohols from syngas over reduced ultrafine Mo-Co-K catalysts was investigated The results showed that the reaction performance was influenced by the Mo/Co ratio, potassium content of the catalysts and reaction conditions remarkably The investigation on the influence of the Mo/Co ratio on the reaction performance revealed that the activity and...

Ultrafine Mo-Co-K catalysts were prepared by the “gel-like” process, followed by the supercritical fluid drying (SCFD) technique Synthesis of higher alcohols from syngas over reduced ultrafine Mo-Co-K catalysts was investigated The results showed that the reaction performance was influenced by the Mo/Co ratio, potassium content of the catalysts and reaction conditions remarkably The investigation on the influence of the Mo/Co ratio on the reaction performance revealed that the activity and selectivity for the formation of alcohols as well as the ratio of C2+OH/C1OH showed pronounced maxima at the Mo/Co ratio of 7∶1 The activity and selectivity for the formation of alcohols showed obvious maxima at the potassium content of 1w%, but the ratio of C2+OH/C1OH was reduced with the potassium content monotonously The increase of temperature was favourable to the increase of the space-time-yield (STY) of alcohols, but the selectivity to alcohols and the ratio of C2+OH/C1OH showed maxima at the temperature of 300℃ Raising pressure enhanced the STY of alcohols and the selectivity to alcohols as well as the ratio of C2+OH/C1OH The high space velocity was favourable to the increase of the selectivity to alcohols but unfavourable to the ratio of C2+OH/C1OH, and the STY of alcohols can be reached a maxima at the space velocity of 1000h-1 Under the reaction conditions of 300℃, 60MPa and 10000h-1, the STY of higher alcohols was 6244g/kg-cath, the selectivity to higher alcohols was 485% and the ratio of C2+OH/C1OH was 108 over the ultrafine Mo-Co-K (Mo/Co=7∶1,K 1w%) catalyst

采用类凝胶法和超临界干燥技术制得超细Mo -Co -K催化剂。研究了还原态催化剂上CO加氢合成低碳醇的反应性能 ,考察了不同钼钴比、钾盐助剂含量和反应条件对合成低碳醇性能的影响。在 30 0℃、6 0MPa、1 0 0 0 0h- 1 的反应条件下 ,超细Mo -Co -K(Mo/Co =7∶1 ,K含量为 1 % )催化剂上低碳醇的时空产率达到 62 4 4g/kg -cat h ,醇选择性为 48 5% ,C2 +OH/C1 OH =1 0 8。

Ultrafine Mo-Co-K catalysts were prepared by the “gel-like”method followed by supercritical fluid drying technique The texture and structure of ultrafine Mo-Co-K catalysts were characterized by BET, TEM, XRD and TPR, and the performances for alcohol synthesis on reduced catalysts from syngas were investigated It was revealed that appropriate addition of cobalt and potassium into the catalyst system resulted in an increase of the specific surface area and a decrease of the average...

Ultrafine Mo-Co-K catalysts were prepared by the “gel-like”method followed by supercritical fluid drying technique The texture and structure of ultrafine Mo-Co-K catalysts were characterized by BET, TEM, XRD and TPR, and the performances for alcohol synthesis on reduced catalysts from syngas were investigated It was revealed that appropriate addition of cobalt and potassium into the catalyst system resulted in an increase of the specific surface area and a decrease of the average pore radius of the catalyst, but more addition of cobalt and potassium showed a quite opposite trend At Co/Mo=1∶7 and K w%=1%, the catalyst got its maximum specific surface area and minimum average pore radius of 22 13 m 2/g and 8 93 nm, respectively Mo, Co and K in ultrafine Mo-Co-K catalysts showed strong interaction which led to the formation of CoMoO 4 and K 2Mo 4O 13 The incorporation of cobalt and potassium into the catalyst system resulted in the decrease of the reduction temperature of the catalyst, which could be attributed to the interaction among Mo, Co and K The incorporation of cobalt into the catalyst system not only improved the selectivity for alcohols and activity of the catalyst significantly, but also shifted the distribution of alcohols towards higher ones The incorporation of potassium into the catalyst system obviously increased both activity and selectivity for the formation of alcohols and shifted the product distribution of alcohols towards lower ones Optimum activity to alcohols could be achieved at an optimum Co/Mo atomic ratio (1∶7) and K content (w 1%), i.e., Alc STY=624 4g/kg h, Alc sel =48 5% and C 2+ OH/C 1OH=1 08 under 300℃, 6 0MPa, and 10000h -1

采用类凝胶法和超临界流体干燥技术制备了超细Mo -Co -K催化剂。通过BET、TEM、XRD和TPR等表征手段比较分析了不同制备参数尤其是Co/Mo比对超细Mo-Co -K催化剂性能的影响。结果表明 ,制得的催化剂为大比表面积、小粒径、大孔超细粒子。超细催化剂中Mo、Co、K之间具有较强的相互作用 ,形成了CoMoO4 和K2 Mo4 O13 物种。超细Mo基催化剂中加入Co和K均可降低催化剂的还原温度。合成低碳醇反应评价结果表明 ,超细Mo -Co-K催化剂具有很高的催化活性、选择性以及生成碳二以上醇的选择性。

 
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