Power content M 2-values smaller than one

Luo, Xiaobing; Chen, P.; Wang, Y.

doi:10.1007/s00340-009-3623-8

Cited by 16 publications

(20 citation statements)

References 6 publications

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“…Luo and B.H. Davis found that potassium (a strong base) promoter may effectively enhance the C 2 olefin/paraffin ratio and C 2 olefin fraction . As listed in Supporting Information Table S3, the high C 2 olefin/paraffin (O/P) ratio of catalyst F3 also demonstrates that the 1200 °C passivated alumina phase may act as a solid base which is similar to potassium to some extent (i. e., still not completely like K yet considering their different CO conversion trends), however, a good thing is that, unlike potassium, this 1200 °C passivated alumina phase is insoluble in water/steam conditions.…”

Section: Resultsmentioning

confidence: 99%

Development of Highly Selective Support for CO Hydrogenation to Light Olefins with Partially Passivated Iron Catalysts

et al. 2019

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To rule out disturbances from water‐soluble efficient promoters (e. g., K2O or combination of S/Na), a simplified iron/support catalyst system was employed to investigate novel supports for the catalytic conversion of syngas (CO+H2) to light olefins (FTO). A series of supports with nominal compositions of ZnAl2O4 ⋅ xAl2O3 (x=1, 2, 3) were prepared by coprecipitation and subsequent high temperature calcination at 1200 °C for 24 h to generate partially passivated ZnAl2O4 and Al2O3 phases, through which each formed component of a catalyst may minimize interactions among them and exhibit unique activity. Iron catalysts were prepared by incipient wetness of iron salts over these supports. At a total pressure of ca. 20 bar and a CO conversion of 35 %, a catalyst with a nominal composition of 15 %Fe/85 %(ZnAl2O4 ⋅ 3Al2O3) exhibits a surprising C2=‐C4= hydrocarbon distribution of 58 %, which reaches a huge increase by almost 100 % in comparison with iron catalysts over regular supports (e. g., carbon, gamma‐Al2O3, etc.). This catalyst demonstrates the 1200 °C passivated ZnAl2O4 ⋅ 3Al2O3 as probably the most selective support material for iron‐based FTO catalysts. At CO conversion of 35 %, the contents of ethylene in C2, propylene in C3, and butylene in C4 products achieve extraordinary values of 82 %, 92 %, and 91 %, respectively.

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Section: Resultsmentioning

confidence: 99%

Development of Highly Selective Support for CO Hydrogenation to Light Olefins with Partially Passivated Iron Catalysts

et al. 2019

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“…More importantly, a Fe‐based catalyst in the F‐T synthesis contains K (Potassium), Cu (Copper), Zn (Zine), and Al(Aluminum) promoters are used to improve the activity and selectivity. Potassium promoter of iron‐based catalyst increases CO absorption on the active sites, and the selectivity light hydrocarbons, also decreases the amount of CH 4 selectivity . Cu and K promoters are used for FTS to increase the WGS activity on many iron‐based catalysts …”

Section: Introductionmentioning

confidence: 99%

Modeling Selectivity in the Fischer‐Tropsch Process with Response Surface Methodology

Atashi

Dinarvandi

2018

ChemistrySelect

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In Fischer-Tropsch synthesis, biomass and agricultural residue as a renewable and reliable resource contains carbon, hydrogen and oxygen. Fischer-Tropsch synthesis depends on the carbon structure available resources (coal, biomass, natural gas), which plays an important role in most of the primary energy supply. In this article, the effects of factors affecting the selectivity a model of Fe/Cu/K/Al catalyst for the optimization of products were investigated using statistical method. The statistical method is a relationship between the response process and the independent variable in the selectivity model. The results show, Adj R 2 and R-Sq are significant values in a model used for the optimization of products. Finally, maximizing CO + CO 2 conversion and C 5 + selectivity and minimizing CH 4 , CO, CO 2 , C 2-4 , olefin in C 2-4 selectivity were investigated under best operating conditions.

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“…Iron and cobalt are the two elements that have been the most studied for FTS. 8,9 There are four different types of iron carbide oen found in the iron FT catalysts, namely c-Fe 5 C 2 , 3 0 -Fe 2.2 C, 3 0 -Fe 2 C and q-Fe 3 C. 9 Several factors determine the stability and activity of iron carbides for FT synthesis (e.g., method of preparation, 10-12 metal promoters, 6,7,[13][14][15] alkali promoters, [16][17][18][19][20] metal oxide additives, [21][22][23][24][25] and process conditions. Iron is oen promoted with copper, silica, alumina, potassium and/or other alkali metals in order to convert syngas effectively to hydrocarbons that can be further processed into liquid fuels.…”

Section: Introductionmentioning

confidence: 99%

Fischer–Tropsch synthesis: effect of Cu, Mn and Zn addition on activity and product selectivity of cobalt ferrite

et al. 2016

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The effect of Cu, Mn and Zn addition on cobalt ferrite was investigated for Fischer-Tropsch synthesis (FTS).Oxalate co-precipitation followed by decomposition under inert conditions was used to obtain various metal containing cobalt ferrites (Co 0.7 M 0.3 Fe 2 O 4 ). The carburization of cobalt ferrite in flowing CO at 270 C and 175 psig yielded iron carbides (c-Fe 5 C 2 and 3 0 -Fe 2.2 C) along with a bimetallic FeCo alloy. The extent of carburization was compared among Cu, Mn, and Zn doped catalysts with undoped cobalt ferrites under similar conditions. XRD and Mössbauer spectroscopy analysis of the freshly carburized samples followed by passivation revealed that carburization of cobalt ferrite did not change appreciably with addition of Cu or Mn. On the other hand, Zn was found to retard the carburization of cobalt ferrite. Analysis of the used FT catalysts suggests that Cu is less efficient over Mn and Zn in stabilizing the iron carbides (i.e., active form of iron) during FT synthesis. The FT activity remains more or less the same for the undoped, Cu and Zn containing cobalt ferrites at higher temperatures. The CO conversion of Co 0.7 Mn 0.3 Fe 2.0 catalyst was much lower than the other catalysts tested. Addition of Zn or Mn to cobalt ferrite was found to promote alcohol formation, particularly at higher reaction temperatures. The water-gas shift activity of the catalysts was found to decrease in the following order, Co 1.0 Fe 2.0 > Co 0.7 Mn 0.3 Fe 2.0 > Co 0.7 Zn 0.3 Fe 2.0 > Co 0.7 Cu 0.3 Fe 2.0 .

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Power content M 2-values smaller than one

Cited by 16 publications

References 6 publications

Development of Highly Selective Support for CO Hydrogenation to Light Olefins with Partially Passivated Iron Catalysts

Development of Highly Selective Support for CO Hydrogenation to Light Olefins with Partially Passivated Iron Catalysts

Modeling Selectivity in the Fischer‐Tropsch Process with Response Surface Methodology

Fischer–Tropsch synthesis: effect of Cu, Mn and Zn addition on activity and product selectivity of cobalt ferrite

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