Fischer–Tropsch synthesis: EXAFS study of Ru and Pt bimetallic Co based catalysts

Pirola, Carlo; Scavini, Marco; Galli, F.; Vitali, S.; Comazzi, A.; Manenti, Flavio; Ghigna, Paolo

doi:10.1016/j.fuel.2014.04.063

Cited by 37 publications

(24 citation statements)

References 34 publications

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“…It is evident that the reduction of Co species without noble metals has its onset at approximately 550 K and shows a maximum at around 640 K on the Co+Mn+Zr/SiO2 catalyst. Reduction over the Co+Mn+Zr/SiO2 catalyst during the 8 h hold proceeded slowly although a gradual reduction occurred and the extent of reduction eventually achieved is twice that calculated from the reduction below 673 K. In the case of the noble metal-modified catalysts, however, the reduction peaks are shifted to lower [23]. Based on these results, it appears that the addition of 0.5 wt.% Pt generates a cubic structure in the Pt-containing phase.…”

Section: Effect Of Noble Metal Addition and Impregnation Ordermentioning

confidence: 78%

Ruthenium Modification on Mn and Zr-Modified Co/SiO2 Catalysts for Slurry-Phase Fischer-Tropsch Synthesis

Miyazawa¹,

Hanaoka²,

Shimura³

et al. 2015

Catalysts

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Abstract:The addition of Ru to Mn and Zr-modified Co/SiO2 catalysts, while applying different preparation orders and loading amounts, was investigated as a means of enhancing the Fischer-Tropsch synthesis reaction. The coimpregnation of Zr/SiO2 with Co, Mn and Ru gave the most attractive catalytic properties. This can be attributed to the higher dispersion of Co metal resulting from the coimpregnation of Co and Mn as well as enhanced reducibility due to the presence of Ru. The addition of a moderate amount of Ru together with the appropriate order of addition affected both the Co reducibility and the catalytic activity, primarily because of increased reducibility. The addition of even 0.1 wt.% Ru resulted in an obvious enhancement of Fischer-Tropsch synthesis activity.

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Section: Effect Of Noble Metal Addition and Impregnation Ordermentioning

confidence: 78%

Ruthenium Modification on Mn and Zr-Modified Co/SiO2 Catalysts for Slurry-Phase Fischer-Tropsch Synthesis

Miyazawa¹,

Hanaoka²,

Shimura³

et al. 2015

Catalysts

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“…As referred above, the addition of extra components to the traditional Fischer-Tropsch catalysts can enhance their performance by increasing the activity [30,36] and selectivity [12,31,[37][38][39], or by avoiding catalyst poisoning [32][33][34]. In this section we will show how computational methods can help in the understanding of the Fisher-Tropsch catalysis by solid catalysts.…”

Section: Computational Studies On Catalyst Surface Modelsmentioning

confidence: 99%

“…Yet, this is not a trivial task since small variations in the catalyst composition change dramatically the reaction yield and/or selectivity. For instance, the addition of Pt or Ru to Co enhances the activity of the catalyst for the Fischer-Tropsch reaction [30], but the addition of high quantities of Pt to Co based catalysts changes their selectivity toward methanol production [31].…”

Section: Introductionmentioning

confidence: 99%

Fischer-Tropsch Synthesis on Multicomponent Catalysts: What Can We Learn from Computer Simulations?

2015

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Abstract:In this concise review paper, we will address recent studies based on the generalized-gradient approximation (GGA) of the density functional theory (DFT) and on the periodic slab approach devoted to the understanding of the Fischer-Tropsch synthesis process on transition metal catalysts. As it will be seen, this computational combination arises as a very adequate strategy for the study of the reaction mechanisms on transition metal surfaces under well-controlled conditions and allows separating the influence of different parameters, e.g., catalyst surface morphology and coverage, influence of co-adsorbates, among others, in the global catalytic processes. In fact, the computational studies can now compete with research employing modern experimental techniques since very efficient parallel computer codes and powerful computers enable the investigation of more realistic molecular systems in terms of size and composition and to explore the complexity of the potential energy surfaces connecting reactants, to intermediates, to products of reaction. In the case of the Fischer-Tropsch process, the calculations were used to complement experimental work and to clarify the reaction mechanisms on different catalyst models, as well as the influence of additional components and co-adsorbate species in catalyst activity and selectivity.

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“…The FischerTropsch synthesis (FTS) is one of the most important technologies to produce a wide range of hydrocarbon fuels from natural gas, coal and biomass [3,4]. Depending on the feedstock used for synthesis gas production, three different technologies have been developed in the world: coal-toliquids technology (CtL), in which coal is used as the feedstock; gas-to-liquids technology (GtL), where natural gas is used as feedstock; or biomass-to-liquids technology (BtL), in which biomass is the feedstock (see Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

Impact of Na Promoter on Structural Properties and Catalytic Performance of CoNi/Al2O3 Nanocatalysts for the CO Hydrogenation Process: Fischer–Tropsch Technology

2015

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This work deals with the effect of adding Na to bimetallic sol-gel derived alumina supported Co/Ni nanocatalysts in Fischer-Tropsch synthesis. The catalyst activity and selectivity changed with different levels of Na, and the catalyst with 2 % Na loading was selected as an optimal catalyst to compare with un-promoted Co/Ni/ Al 2 O 3 catalyst. Na reduced the methane selectivity by increasing the chain-growth probability (a-value) at 12 bar. The results of physico-chemical characterizations show that the Na promoter plays a significant role in the catalytic structure. Additionally, the kinetic behavior was considered in absence and presence of Na over CoNi/Al 2 O 3 catalysts. We applied an enolic approach, which was developed based on the interaction between adsorption HCO and dissociated adsorption hydrogen, through the Langmuir-Hinshelwood-Hougen-Watson (LHHW) adsorption theory. Kinetic parameters, including the rate constant (k) and activation energy (E a ) of the catalysts, were also determined. The results show that, by adding Na, the activation energy (E a ) decreases and the reaction rate (-R CO ) increases. Graphical Abstract

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Fischer–Tropsch synthesis: EXAFS study of Ru and Pt bimetallic Co based catalysts

Cited by 37 publications

References 34 publications

Ruthenium Modification on Mn and Zr-Modified Co/SiO2 Catalysts for Slurry-Phase Fischer-Tropsch Synthesis

Ruthenium Modification on Mn and Zr-Modified Co/SiO2 Catalysts for Slurry-Phase Fischer-Tropsch Synthesis

Fischer-Tropsch Synthesis on Multicomponent Catalysts: What Can We Learn from Computer Simulations?

Impact of Na Promoter on Structural Properties and Catalytic Performance of CoNi/Al2O3 Nanocatalysts for the CO Hydrogenation Process: Fischer–Tropsch Technology

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