Coke deactivation of Ni and Co catalysts in ethanol steam reforming at mild temperatures in a fluidized bed reactor

Vicente, Jorge; Montero, Carolina; Ereña, Javier; Azkoiti, Miren J.; Bilbao, Javier; Gayubo, Ana G.

doi:10.1016/j.ijhydene.2014.06.093

Cited by 181 publications

(79 citation statements)

References 61 publications

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“…The DTG of used Ni/A catalyst, given in Fig. 7, shows that catalyst presented a only peak at 790 K corresponding to the combustion of filamentous coke with different graphitization degree as has been widely reported in literature [32,65,66]. On the contrary, on doped catalysts, the formation of carbon is markedly suppressed as indicated by the lower relative intensity of the oxidation peaks.…”

Section: Characterization Of Used Catalystssupporting

confidence: 55%

Improved stability of Ni/Al2O3 catalysts by effect of promoters (La2O3, CeO2) for ethanol steam-reforming reaction

et al. 2016

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Section: Characterization Of Used Catalystssupporting

confidence: 55%

Improved stability of Ni/Al2O3 catalysts by effect of promoters (La2O3, CeO2) for ethanol steam-reforming reaction

et al. 2016

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“…After 40 h, a plateau condition was reached and no more variation in both conversion and pressure drop profile was observed. Differently from the data reported by other authors, which observed almost steady performances followed by a severe drop in ethanol conversion and finally a slow decrease in ethanol conversion until total deactivation of the Ni-based catalysts, in this work steady performances were observed [66,67]. The experimental results showed, as commonly reported in the literature, that coke accumulation in the catalytic bed causes an appreciable increase in pressure drops; it is interesting to remark that, after 40 h of TOS, the absence of growth in pressure drops evidences no carbonaceous species accumulation.…”

Section: Catalytic Performances Of Ceo2-sio2 Based Samplescontrasting

confidence: 99%

Renewable Hydrogen from Ethanol Reforming over CeO2-SiO2 Based Catalysts

et al. 2017

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Abstract:In this research, a bimetallic Pt-Ni/CeO 2 -SiO 2 catalyst, synthetized via wet impregnation, was successfully employed for the oxidative steam reforming of ethanol between 300 and 600 • C. The reaction performance of the Pt-Ni catalyst was investigated and compared with the Ni/CeO 2 -SiO 2 , Pt/CeO 2 -SiO 2 as well as CeO 2 -SiO 2 sample. The bimetallic catalyst displayed the best results in terms of hydrogen yield and by-products selectivity, thus highlighting the crucial role of active species (Pt and Ni) in promoting ethanol conversion and reaching the products distribution predicted by thermodynamics. The most promising sample, tested at 500 • C for more than 120 h, assured total conversion and no apparent deactivation, demonstrating the stability of the selected formulation. By changing contact time, the dependence of carbon formation rate on space velocity was also investigated.

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“…8d. Thus, the formation of carbon deposition and the caking of catalysts were inhibited by adding CeO2 (Chiou et al 2014;Vicente et al 2014) because it was well known that CeO2 has unique redox properties and high oxygen vacancy and mobility, which can promote the gasification of carbonaceous species deposited on a catalyst (Perrichon et al 1994;Zhang et al 2014;Li et al 2015). Figures 8c and 8d also showed that some spherical particles were attached on the surface of catalysts after reaction, wherein the particles attached on the surface of NF/C0.4PG0.6 catalyst were in a more uniform distribution than those attached on NF/PG.…”

Section: Characterizations Of Spent Catalystsmentioning

confidence: 99%

Hydrogen Production from Steam Reforming of Acetic Acid over Ni-Fe/Palygorskite Modified with Cerium

Wang¹,

Chen²,

Yang³

et al. 2017

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The steam reforming of acetic acid (SRA) was carried out in a fixed-bed tubular reactor with Ni-Fe/ceria-palygorskite (CPG) catalysts. The asprepared catalysts were analyzed by N2 adsorption-desorption, scanning electron microscopy coupled with energy dispersive spectroscopy (SEM-EDS), H2 temperature programmed reduction (H2-TPR), and X-ray diffraction (XRD). The results of H2-TPR and XRD showed that the addition of CeO2 increased the hydrogen consumption of catalysts and the interaction force between active component (Ni-Fe alloy) and carrier. Moreover, the Ni-Fe alloys were successfully synthesized in the Ni-Fe/CPG catalysts and their crystallite sizes were decreased by adding CeO2. In addition, these catalysts were employed to SRA at 600 °C, GHSV = 14427 h -1 and different molar ratio of S/C. The experimental results revealed that the Ni-Fe/C0.4PG0.6 catalyst can achieve the highest yield of H2 (87%) and HOAc conversion (95%), as well as the highest stability during the process of steam SRA. Additionally, the spent catalysts were characterized by XRD, SEM, and thermogravimetric analysis (TGA). The results showed that the addition of CeO2 enhanced the stability and activity of Ni-Fe/palygorskite catalyst and reduced the coke deposition rate on the catalyst surface.

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Coke deactivation of Ni and Co catalysts in ethanol steam reforming at mild temperatures in a fluidized bed reactor

Cited by 181 publications

References 61 publications

Improved stability of Ni/Al2O3 catalysts by effect of promoters (La2O3, CeO2) for ethanol steam-reforming reaction

Improved stability of Ni/Al2O3 catalysts by effect of promoters (La2O3, CeO2) for ethanol steam-reforming reaction

Renewable Hydrogen from Ethanol Reforming over CeO2-SiO2 Based Catalysts

Hydrogen Production from Steam Reforming of Acetic Acid over Ni-Fe/Palygorskite Modified with Cerium

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