Ni/ZrO2 catalysts in ethanol steam reforming: Inhibition of coke formation by CaO-doping

Nichele, Valentina; Signoretto, Michela; Pinna, Francesco; Menegazzo, Federica; Rossetti, Ilenia; Cruciani, Giuseppe; Cerrato, G.; Michele, Alessandro Di

doi:10.1016/j.apcatb.2013.11.037

Cited by 119 publications

(69 citation statements)

References 56 publications

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“…On the other hand, decomposition of alkaline nitrates during calcination can lead to destruction of the zirconia porous structure or creation of monolayer of alkaline metal oxide that covers ZrO 2 surface. Usually, such layer exhibits increased oxygen storage capacity that helps to remove carbonaceous deposit from the catalyst, which may explain why lower surface sample containing calcium reveals the highest activity in cellulose conversion process [17].…”

Section: Resultsmentioning

confidence: 99%

“…The obtained results demonstrated that potassium was the most effective in reducing the coking rate of the investigated catalysts, while application of magnesium resulted in the smallest effect among the studied dopants. Nichele et al [17] investigated ethanol steam reforming. They noticed that modification of Ni/ZrO 2 by CaO inhibited the carbon deposition on the catalyst surface.…”

Section: Introductionmentioning

confidence: 99%

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Effect of alkali and alkaline earth metals addition on Ni/ZrO2 catalyst activity in cellulose conversion

Ryczkowski

Niewiadomski

Michalkiewicz

et al. 2016

J Therm Anal Calorim

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This work is devoted to the investigation of the effect of alkali and alkaline earth metals addition on Ni/ ZrO 2 catalyst activity in high-temperature cellulose conversion. The catalysts containing 20 % of Ni and 1 % of Ca, Mg, Na and K (calculated per amount of oxide) introduced on ZrO 2 surface by impregnation method were prepared. The surface properties of the investigated samples were characterized by X-ray diffraction, temperatureprogrammed reduction, flame atomic absorption spectrometry, scanning electron microscopy and energy-dispersive X-ray spectroscopy. The composition of the gaseous products was identified using gas chromatography. The performed studies demonstrated that introduction of alkali and alkaline earth metals on the surface of nickel catalyst resulted in the considerable increase in the production of hydrogen in comparison with Ni/ZrO 2 reference sample. The highest hydrogen yield was formed in the presence of the catalyst modified by calcium.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of alkali and alkaline earth metals addition on Ni/ZrO2 catalyst activity in cellulose conversion

Ryczkowski

Niewiadomski

Michalkiewicz

et al. 2016

J Therm Anal Calorim

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show abstract

“…The resistance towards coking increased due to the formation of oxygen vacancies, that can activate CO2 and H2O, thus favouring the gasification of coke. 21 With the addition of calcium on ceria the carbon balance is slightly higher, but coke is still formed. This has been proven by TPO profiles of used catalysts ( Figure 11).…”

Section: Doping With Calciummentioning

confidence: 99%

“…29 Zirconium hydroxide was prepared by precipitation from ZrOCl28H2O (Aldrich) at constant pH= 8.6 and then aged for 20 hours at 90 °C. 21 Then Zr(OH)4 was calcined in flowing air (30 mL/min) at 650 °C for 3 hours.…”

Section: Experimental 21 Synthesis Of Supportsmentioning

confidence: 99%

“…Actually the use of nickel is limited by coking and Ni sintering phenomena. 20,21 Noble metals are known for their ability to break the C-C bond and it's known that gold nanoparticles favour the water gas-shift reaction as well. [22][23][24] However, the particle size of the gold nanoparticles is of great importance for the catalytic activity and inhibiting the sintering of the nanoparticles is crucial in terms of the long-term activity.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Production by Ethanol Steam Reforming on Ni-Based Catalysts: Effect of the Support and of CaO and Au Doping

et al. 2017

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ARTICLEThis journal is © The Royal Society of Chemistry 20xx J. Name., 2013, 00, 1-3 | 1 Nickel-based catalysts were investigated for hydrogen production by ethanol steam reforming. A suitable support was looked for among the metal oxides TiO2, ZrO2 and CeO2. Alongside catalytic testing with ethanol-water mixture, a series of characterization measurements were carried out: N2-physisorption, XRD, TPR, TPO, CO2-TPD, SEM, AAS and IC. Zirconium and cerium oxides proved to be suitable supports, even if both still suffer from coking phenomena. The effects of doping by both calcium oxide and gold nanoparticles were checked. Doping by calcium oxide prevented deactivation and highly increased the hydrogen yield. Moreover, the addition of gold nanoparticles greatly improved the hydrogen yield. The combination of the two dopants resulted in the best performing catalyst: the basic doping by CaO and the promotion of the water gas shift reaction by gold nanoparticles contributed to the highest hydrogen production.

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Hydrogen Production from Oxygenated Hydrocarbons: Review of Catalyst Development, Reaction Mechanism and Reactor Modeling

Mohamedali

Henni

Ibrahim

2017

Hydrogen Production Technologies

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Ni/ZrO2 catalysts in ethanol steam reforming: Inhibition of coke formation by CaO-doping

Cited by 119 publications

References 56 publications

Effect of alkali and alkaline earth metals addition on Ni/ZrO2 catalyst activity in cellulose conversion

Effect of alkali and alkaline earth metals addition on Ni/ZrO2 catalyst activity in cellulose conversion

Hydrogen Production by Ethanol Steam Reforming on Ni-Based Catalysts: Effect of the Support and of CaO and Au Doping

Hydrogen Production from Oxygenated Hydrocarbons: Review of Catalyst Development, Reaction Mechanism and Reactor Modeling

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