Characterization of Modified Fischer–Tropsch Catalysts Promoted with Alkaline Metals for Higher Alcohol Synthesis

Cosultchi, A.; Pérez-Luna, M.; Morales‐Serna, José Antonio; Salmón, Manuel

doi:10.1007/s10562-012-0765-9

Cited by 27 publications

(14 citation statements)

References 40 publications

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“…When the potassium was introduced, the peak of weak acidic sites shifted to a lower temperature, and yet that of strong acidic sites slightly shifted towards a higher temperature, revealing that the strength of weak acidic sites decreased and the strength of strong acidic sites increased slightly. In comparison of the area for NH3 desorption, it was apparent that the ammonia amounts of both weak acidic sites and strong acidic sites obviously decreased when adding the potassium, due to the partial neutralization of the surface acidity by alkali compounds [36,39,40]. As known, SiO2 possesses remarkably weak acidity.…”

Section: Nh3-tpdmentioning

confidence: 97%

“…Therefore, this work was mainly to clarify the reason of difference in reaction behaviors over the Cu catalysts supported on Al 2 O 3 and SiO 2 for CO hydrogenation into higher alcohols. Considering that alkali addition strongly affected the selectivity towards higher alcohols [13,15,[36][37][38][39][40][41], herein, the present study also put forth effort to explore the effects of potassium addition on the structure and performance of Al 2 O 3 and SiO 2 supported Cu catalysts. Moreover, the physicochemical properties of the prepared catalysts were characterized via various techniques, including X-ray diffraction (XRD), N 2 absorption-desorption, H 2 -temperature-programmed reduction (H 2 -TPR), temperature-programmed desorption of ammonia (NH 3 -TPD), X-ray photoelectron spectroscopy (XPS), and in situ Fourier-transform infrared spectroscopy (FTIR), and the characterization results were discussed alongside with the catalytic data in detail.…”

Section: Introductionmentioning

confidence: 99%

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The Support Effects on the Direct Conversion of Syngas to Higher Alcohol Synthesis over Copper-Based Catalysts

Zhang

Zhang³

et al. 2019

Catalysts

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The types of supports employed profoundly influence the physicochemical properties and performances of as-prepared catalysts in almost all catalytic systems. Herein, Cu catalysts, with different supports (SiO2, Al2O3), were prepared by a facile impregnation method and used for the direct synthesis of higher alcohols from CO hydrogenation. The prepared catalysts were characterized using multiple techniques, such as X-ray diffraction (XRD), N2 sorption, H2-temperature-programmed reduction (H2-TPR), temperature-programmed desorption of ammonia (NH3-TPD), X-ray photoelectron spectroscopy (XPS) and in situ Fourier-transform infrared spectroscopy (FTIR), etc. Compared to the Cu/Al2O3 catalyst, the Cu/SiO2 catalyst easily promoted the formation of a higher amount of C1 oxygenate species on the surface, which is closely related to the formation of higher alcohols. Simultaneously, the Cu/Al2O3 and Cu/SiO2 catalysts showed obvious differences in the CO conversion, alcohol distribution, and CO2 selectivity, which were probably originated from differences in the structural and physicochemical properties, such as the types of copper species, the reduction behaviors, acidity, and electronic properties. Besides, it was also found that the gap in performances in two kinds of catalysts with the different supports could be narrowed by the addition of potassium because of its neutralization to surface acidy of Al2O3 and the creation of new basic sites, as well as the alteration of electronic properties.

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Section: Nh3-tpdmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

The Support Effects on the Direct Conversion of Syngas to Higher Alcohol Synthesis over Copper-Based Catalysts

Zhang

Zhang³

et al. 2019

Catalysts

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“…From the literatures [12,17], we know that the texture properties of the AC support after the introduction of active components had little impact on catalyst performance. As for the Mn additive, it is known that Mn usually provides a dispersion effect of active sites and/or a favorable production of olefins for Co-Cu type catalysts [7,36]. The situation is more complicated when promoters such Al, Si, and La are added to Co/AC catalysts [10,12,17].…”

Section: Hr-tem Observationsmentioning

confidence: 99%

Synthesis of higher alcohols by the Fischer–Tropsch reaction over activated carbon supported CoCuMn catalysts

Pei¹,

Jian

Chen³

et al. 2015

RSC Adv.

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Activated carbon supported CoCuMn catalysts prepared by incipient co-impregnation were studied by using Fischer-Tropsch reaction, XRD, HR-TEM, and H 2 -TPR techniques. The results showed that good activities and selectivities towards C 1 -C 14 alcohols can be obtained with the fractions of C 2 -C 5 alcohols up to 80% in total alcohols. It is found that increasing the Cu/Co composition ratio resulted in the enhancement of alcohol selectivity. Furthermore, our characterizations revealed that large Cu nano-particles were decorated by small, spherical Co nano-particles, which we speculate that such construction were responsible for the favored formation of C 2+ alcohols. It is also considered that smaller cobalt particles probably resulted in more number of Co 0 and thus contributed to the improvement of CO conversion.

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“…The catalysts for ethanol and higher alcohols synthesis can be divided into the following four categories: (a) Rhbased catalysts [3][4][5], (b) Mo-based catalysts [6,7], (c) modified Fischer-Tropsch catalysts [8,9], and (d) modified methanol synthesis catalysts [10,11]. Among them, Rh-based catalysts are the most promising ones in ethanol synthesis due to their unique CO adsorption behavior.…”

Section: Introductionmentioning

confidence: 99%

The Promoting Effect of Fe Doping on Rh/CeO2 for the Ethanol Synthesis

et al. 2015

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The effects of Fe promotion were investigated on the activity and selectivity of Rh/CeO 2 catalyst for the direct synthesis of ethanol from syngas. The catalysts were comprehensively characterized by X-ray diffraction (XRD), N 2 adsorption-desorption, CO uptake, H 2 -TPR, temperature programmed surface reaction (TPSR), and FT-IR. XRD, CO uptake and FT-IR measurements indicated that Rh particles were well dispersed. TPSR results revealed that the addition of Fe changed CO dissociation behavior over the catalysts. FT-IR results showed that Fe promoter stabilized both linear carbonyl and gem-dicarbonyl species, which could be responsible for the improved catalytic activity. The interaction between Rh and Fe species is proposed to play a crucial role in achieving higher ethanol selectivity. Graphical Abstract

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Characterization of Modified Fischer–Tropsch Catalysts Promoted with Alkaline Metals for Higher Alcohol Synthesis

Cited by 27 publications

References 40 publications

The Support Effects on the Direct Conversion of Syngas to Higher Alcohol Synthesis over Copper-Based Catalysts

The Support Effects on the Direct Conversion of Syngas to Higher Alcohol Synthesis over Copper-Based Catalysts

Synthesis of higher alcohols by the Fischer–Tropsch reaction over activated carbon supported CoCuMn catalysts

The Promoting Effect of Fe Doping on Rh/CeO2 for the Ethanol Synthesis

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