Effect of calcination/reduction conditions of Ni/La2O3–αAl2O3 catalyst on its activity and stability for hydrogen production by steam reforming of raw bio-oil/ethanol

Valle, Beatríz; Aramburu, Borja; Remiro, Aingeru; Bilbao, Javier; Gayubo, Ana G.

doi:10.1016/j.apcatb.2013.09.022

Cited by 118 publications

(72 citation statements)

References 60 publications

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“…These results give evidence of the important role of the support and the metal-support interaction on the metal reducibility, so that the Ni-Al2O3 interactions are stronger than the interactions of Ni with CeO2 and/or ZrO2 oxides [34,35]. Two wide and asymmetric reduction domains are observed for Ni/LaAl catalyst: the reduction to Ni 0 of surface NiO with low interaction with the support takes place in the 250-370 °C range, whereas the band between 370-700 °C corresponds to the reduction to Ni 0 of well dispersed NiOx species, probably of an amorphous nature and with high interaction with the support [25]. A reduction peak of low intensity is also observed above 700 °C for the Ni/LaAl catalyst that corresponds to the reduction to Ni 0 of the Ni 2+ in the spinel phase (NiAl2O4), whose low intensity is explained by its low calcination temperature (550 °C) because the formation of the spinel requires higher temperatures [25,36].…”

Section: Physical Properties (N 2 Adsorption-desorption)mentioning

confidence: 99%

“…Thus, Politano and Chiarello [23] have proven the relevance of the co-adsorption of other compounds in the reaction medium on the adsorption of CO on Ni sites, with the formation of intermediate COH with the adsorbed H. This complex behaviour of Ni sites makes the interpretation of the results difficult. The experimental runs were carried out in an experimental device with two units in series (thermal step and catalytic step, the latter in fluidized bed reactor), whose adequacy for SR and OSR of aqueous and raw bio-oil has been previously proven, as it minimizes operating problems (such as plugging of reactor piping) as well as catalyst deactivation in the reforming step [15,21,22,[24][25][26][27]. The properties of the catalysts have been determined with different techniques (N 2 adsorption-desorption, Temperature Programmed Reduction (TPR), X-ray Diffraction (XRD)), in order to explain the differences in the kinetic behaviour of the catalysts.…”

Section: Introductionmentioning

confidence: 99%

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Oxidative Steam Reforming of Raw Bio-Oil over Supported and Bulk Ni Catalysts for Hydrogen Production

et al. 2018

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Several Ni catalysts of supported (on La 2 O 3 -αAl 2 O 3 , CeO 2 , and CeO 2 -ZrO 2 ) or bulk types (Ni-La perovskites and NiAl 2 O 4 spinel) have been tested in the oxidative steam reforming (OSR) of raw bio-oil, and special attention has been paid to the catalysts' regenerability by means of studies on reaction-regeneration cycles. The experimental set-up consists of two units in series, for the separation of pyrolytic lignin in the first step (at 500 • C) and the on line OSR of the remaining oxygenates in a fluidized bed reactor at 700 • C. The spent catalysts have been characterized by N 2 adsorption-desorption, X-ray diffraction and temperature programmed reduction, and temperature programmed oxidation (TPO). The results reveal that among the supported catalysts, the best balance between activity-H 2 selectivity-stability corresponds to Ni/La 2 O 3 -αAl 2 O 3 , due to its smaller Ni 0 particle size. Additionally, it is more selective to H 2 than perovskite catalysts and more stable than both perovskites and the spinel catalyst. However, the activity of the bulk NiAl 2 O 4 spinel catalyst can be completely recovered after regeneration by coke combustion at 850 • C because the spinel structure is completely recovered, which facilitates the dispersion of Ni in the reduction step prior to reaction. Consequently, this catalyst is suitable for the OSR at a higher scale in reaction-regeneration cycles.

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Section: Physical Properties (N 2 Adsorption-desorption)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Oxidative Steam Reforming of Raw Bio-Oil over Supported and Bulk Ni Catalysts for Hydrogen Production

et al. 2018

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“…Thermodynamic equilibrium calculations were simulated using Aspen Hysys 7.3 software (2011, Burlington, MA, USA) by taking into account all the possible reactions (Equations (2)- (10)) [5][6][7].…”

Section: Mole Of Mole Of Etanol Inletmentioning

confidence: 99%

“…The SRE can also be represented by a network of reactions (Equations (2)- (10)) [5][6][7], depending on the reaction conditions and the catalyst used, to reflect the formation of a complex set of by-products including carbon monoxide (CO), methane (CH4), ethane (C2H6), ethylene (C2H4), and acetaldehyde (CH3CHO) [4,8,9]. …”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production by Steam Reforming of Ethanol on Rh-Pt Catalysts: Influence of CeO2, ZrO2, and La2O3 as Supports

et al. 2015

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CeO2-, ZrO2-, and La2O3-supported Rh-Pt catalysts were tested to assess their ability to catalyze the steam reforming of ethanol (SRE) for H2 production. SRE activity tests were performed using EtOH:H2O:N2 (molar ratio 1:3:51) at a gaseous space velocity of 70,600 h −1 between 400 and 700 °C at atmospheric pressure. The SRE stability of the catalysts was tested at 700 °C for 27 h time on stream under the same conditions. RhPt/CeO2, which showed the best performance in the stability test, also produced the highest H2 yield above 600 °C, followed by RhPt/La2O3 and RhPt/ZrO2. The fresh and aged catalysts were characterized by TEM, XPS, and TGA. The higher H2 selectivity of RhPt/CeO2 was ascribed to the formation of small (~5 nm) and stable particles probably consistent of Rh-Pt alloys with a Pt surface enrichment. Both metals were oxidized and acted as an almost constant active phase during the stability test owing to strong metal-support interactions, as well as the superior oxygen mobility of the support. The TGA results confirmed the absence of carbonaceous residues in all the aged catalysts.

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“…The composition of synthesis gas obtained in the process is more preferable for the production of methanol and liquid products by the Fischer-Tropsch reaction, because the cost of synthesis-gas produced by the partial oxidation of methane is estimated to be almost 1.5 times lower than that produced by steam reforming [6,7]. In order to achieve a practical application of the oxidative conversion of methane, the development of highly active, stable, selective, and cost-effective catalysts are desired [8,9].…”

Section: Introductionmentioning

confidence: 99%

Nickel Oxide Catalysts for Partial Oxidation of Methane to Synthesis Gas

Dossumov¹,

Kurokawa

Yergaziyeva³

et al. 2016

Eur Chem Tech J

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Nickel catalysts supported on different carriers (θ-Al 2 O 3 , γ-Al 2 O 3 , HZSM-5 with γ-Al 2 O 3 , HZSM-5, and NaX) have been investigated for the partial oxidation of methane. All the supported nickel catalysts showed a high activity for the formation of synthesis gas, and γ-Al 2 O 3 was the most effective among all the tested carriers. The effect of the heat-treatment temperature of the 3 wt.% Ni/γ-Al 2 O 3 catalyst on its catalytic activity was studied, and a considerable decrease in its activity was observed by the heat-treatment of the catalyst at 1000 °C compared with the catalysts prepared by the 300-800 °C -calcination. The XRD analysis suggested the formation of NiAl 2 O 4 that is a non-reducible compound at the high calcination temperature. The addition of a modifier (Co, Ce, or La) to the 3 wt.% Ni/γ-Al 2 O 3 catalyst increased the selectivity to H 2 and CO with the decreasing selectivity to CO 2 , and the highest selectivity to H 2 was obtained by the 5 wt.% NiLa/γ-Al 2 O 3 . The developed 5 wt.% NiLa/γ-Al 2 O 3 catalyst showed a high stability for 30 h for the partial oxidation of methane at 750 °C. The methane conversion reached 95%, selectivity to hydrogen 83% and 52% to carbon monoxide.

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Effect of calcination/reduction conditions of Ni/La2O3–αAl2O3 catalyst on its activity and stability for hydrogen production by steam reforming of raw bio-oil/ethanol

Cited by 118 publications

References 60 publications

Oxidative Steam Reforming of Raw Bio-Oil over Supported and Bulk Ni Catalysts for Hydrogen Production

Oxidative Steam Reforming of Raw Bio-Oil over Supported and Bulk Ni Catalysts for Hydrogen Production

Hydrogen Production by Steam Reforming of Ethanol on Rh-Pt Catalysts: Influence of CeO2, ZrO2, and La2O3 as Supports

Nickel Oxide Catalysts for Partial Oxidation of Methane to Synthesis Gas

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