Bi-reforming of methane for hydrogen production using LaNiO_3/Ce_xZr_(1-x)O_2 as precursor material

摘要

In this work, the performance of Ni-based catalysts derived from LaNiO3/CexZr1-xO2 (x = 1, 0.75 and 0.50) for the bi-reforming of methane from biogas was studied. Furthermore, the catalysts were characterized by several techniques including in situ X-ray diffraction (in-situ XRD) and X-ray absorption near edge structure spectroscopy XANES at Ce L-III-edge and at Ni K-edge. It was shown that (i) all catalysts were reduced at temperatures below 700 degrees C and (ii) the addition of zirconium into cerium lattice improved the reducibility of the supports. Additionally, the catalytic test results showed that all supported catalysts initially exhibited a decrease in CH4 and CO2 conversions, which could be associated with possible oxidation of nickel particles. It has been proved that the precursor LaNiO3/Ce0.75Zr0.25O2 had the best performance since it presented the highest catalytic activity and good selectivity for hydrogen during the bi-reforming of methane at 800 degrees C. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.