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Issue 8, 2020
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Kinetic study of the methane dry (CO2) reforming reaction over the Ce0.70La0.20Ni0.10O2−δ catalyst

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Abstract

The kinetic behaviour of the Ce0.70La0.20Ni0.10O2−δ catalyst during the methane dry reforming reaction was investigated in a fixed bed reactor in the temperature range of 923–1023 K with the partial pressure of CH4 and CO2 ranging between 5 and 50 kPa. The experimental data were fitted using the empirical power-law rate equation and Langmuir–Hinshelwood kinetic models proposed in literature for the Ni–La2O3 catalytic system and based on two-step single- and dual-site mechanisms. The obtained fitting results, after statistical and thermodynamic discrimination, showed that the mechanism of the dry reforming reaction over the Ce0.70La0.20Ni0.10O2−δ catalyst could be successfully described by the two-step dual-site mechanism. The activation energies for the CH4 consumption from the power law and Langmuir–Hinshelwood models were estimated to be 91.5 and 136.9 kJ mol−1, respectively. The lower activation energies for the CO2 consumption (70.2 and 100.6 kJ mol−1 from both models) suggested that the CO2 activation should faster than CH4. The basic nature of the Ce–La–O sites catalyzed the CO2 conversion to oxy-carbonate, decreasing the CO2 activation energy compared to that of CH4.

Graphical abstract: Kinetic study of the methane dry (CO2) reforming reaction over the Ce0.70La0.20Ni0.10O2−δ catalyst

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Article information


Submitted
30 Oct 2019
Accepted
18 Mar 2020
First published
18 Mar 2020

This article is Open Access

Catal. Sci. Technol., 2020,10, 2652-2662
Article type
Paper

Kinetic study of the methane dry (CO2) reforming reaction over the Ce0.70La0.20Ni0.10O2−δ catalyst

L. Pino, C. Italiano, M. Laganà, A. Vita and V. Recupero, Catal. Sci. Technol., 2020, 10, 2652
DOI: 10.1039/C9CY02192B

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