AUTHOR=Fakeeha Anis H. , Kasim Samsudeen Olajide , Ibrahim Ahmed Aidid , Al-Awadi Abdulrhman S. , Alzahrani Eman , Abasaeed Ahmed Elhag , Awadallah Ahmed E. , Al-Fatesh Ahmed Sadeq 

TITLE=Methane Decomposition Over ZrO2-Supported Fe and Fe–Ni Catalysts—Effects of Doping La2O3 and WO3

JOURNAL=Frontiers in Chemistry

VOLUME=8

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.00317

DOI=10.3389/fchem.2020.00317

ISSN=2296-2646

ABSTRACT=<p>A leading method for hydrogen production that is free of carbon oxides is catalytic methane decomposition. In this research, Fe and Fe–Ni supported catalysts prepared by the wet impregnation method were used in methane decomposition. The effects of doping the parent support (ZrO<sub>2</sub>) with La<sub>2</sub>O<sub>3</sub> and WO<sub>3</sub> were studied. It was discovered that the support doped with La<sub>2</sub>O<sub>3</sub> gave the best performance in terms of CH<sub>4</sub> conversion, H<sub>2</sub> yield, and stability at the test condition, 800°C and 4,000-ml h<sup>−1</sup> g<sup>−1</sup> cat. space velocity. The addition of Ni significantly improved the performance of all the monometallic catalysts. The catalysts were characterized by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), temperature-programmed reduction/oxidation (TPR/TPO), thermogravimetric analyzer (TGA), and microscopy (SEM and Raman) techniques. Phases of the different forms of Fe were identified by XRD. BET showed a drastic decline in the specific surface area of the catalysts with respect to the supports. TPR profiles revealed a progressive change in the valency of Fe in its combined form to the zero valence-free metal. The La<sub>2</sub>O<sub>3</sub>-promoted support gave the best performance and maintained good stability during the time on stream.</p>