Enhanced catalytic performance of La2O3 promoted Co/CeO2 and Ni/CeO2 catalysts for effective hydrogen production by ethanol steam reforming

Magdalena Greluk, Marek Rotko and Sylwia Turczyniak-Surdacka

Renewable Energy, 2020, vol. 155, issue C, 378-395

Abstract: and nickel-based catalysts were synthesized by the co-impregnation method of the ceria support with aqueous solution of the active phase and promoter precursors and evaluated in steam reforming of ethanol (SRE) reaction. The stability of Co/CeO2 and Ni/CeO2 catalysts was effectively improved by the addition of ∼2 wt% of La2O3 promoter as the carbon deposition rate was reduced which results from an increase in an active phase dispersion and from strengthening of a metal-support interactions. Whereas the La2O3 promoter influences on the rate of carbon deposit formation, its type and a degree of graphitization depends on the metal active phase. Highly ordered carbon deposit encapsulating the active sites was mainly formed on the surface of cobalt-based catalysts. Whereas SRE reaction over nickel-based catalysts leads to formation of long filaments carbon with a lower degree graphitization. Temperature of 460 °C was sufficient to obtain complete ethanol conversion for 21 h of SRE process over Ni-0.1La/CeO2 sample and to maintain high selectivity to H2 (88%) and CO2 (68%) over this time. For Co-0.1La/CeO2 catalyst, the higher temperature of 500 °C was required to sustain its stable operation but selectivity to H2 and CO2 was even higher, 94% and 88%, respectively.

Keywords: Hydrogen production; Ethanol steam reforming; Cobalt; Nickel; Lanthanum; Ceria; Carbon deposition (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:155:y:2020:i:c:p:378-395

DOI: 10.1016/j.renene.2020.03.117

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