Applied Catalysis2022，Vol.30421.DOI:10.1016/j.apcatb.2021.121015

Elucidating the role of La3+/Sm3+ in the carbon paths of dry reforming of methane over Ni/Ce-La(Sm)-Cu-O using transient kinetics and isotopic techniques

Efstathiou, Angelos M. Polychronopoulou, Kyriaki Hussien, Aseel G. S. Khaleel, Maryam T. A. Damaskinos, Constantinos M. Dabbawala, Aasif A. Anjum, Dalaver H. Vasiliades, Michalis A. Wehbe, Nimer
Applied Catalysis2022，Vol.30421.DOI:10.1016/j.apcatb.2021.121015
✕
  • NSTL
  • Elsevier

Elucidating the role of La3+/Sm3+ in the carbon paths of dry reforming of methane over Ni/Ce-La(Sm)-Cu-O using transient kinetics and isotopic techniques

Efstathiou, Angelos M. 1Polychronopoulou, Kyriaki 2Hussien, Aseel G. S. 2Khaleel, Maryam T. A. 3Damaskinos, Constantinos M. 1Dabbawala, Aasif A. 2Anjum, Dalaver H. 2Vasiliades, Michalis A. 1Wehbe, Nimer4
扫码查看

作者信息

  • 1. Univ Cyprus
  • 2. Khalifa Univ Sci & Technol
  • 3. Khalifa Univ
  • 4. King Abdullah Univ Sci & Technol
  • 折叠

Abstract

The different effects of the presence of La3+ and Sm3+ heteroatoms in the 5 wt% Ni/45Ce-45(Sm or La)-10Cu-O catalytic system on the carbon deposition and removal reaction paths in the dry reforming of methane (DRM) at 750 ? were investigated using transient kinetic and isotopic experiments. The relative initial rates of carbon oxidation by lattice oxygen of support and that by oxygen derived from CO2 dissociation under DRM reaction conditions were quantified. Ni nanoparticles (23-nm) supported on La3+-doped ceria exhibited at least 3 times higher initial rates of carbon oxidation to CO by lattice oxygen, and ~ 13 times lower rates of carbon accumulation than Ni (18-nm) supported on Sm3+-doped ceria. The concentration and mobility of labile surface oxygen at the Ni-support interface region seems to correlate with carbon accumulation. Ni/Ce-La(or Sm)-10Cu-O formed NiCu alloy nanoparticles, partly responsible for lowering carbon deposition and increasing carbon oxidation rates to CO.

Key words

Doped ceria/Supported Ni catalysts/DRM/Coking/Lattice oxygen/Transient isotopic techniques/FISCHER-TROPSCH SYNTHESIS/OXYGEN-VACANCY FORMATION/CATALYTIC-ACTIVITY/CERIA/CO2/LA/SURFACE/CU/TEMPERATURE/ADSORPTION

引用本文复制引用

出版年

2022
Applied Catalysis

Applied Catalysis

ISSN：0926-3373
被引量20
参考文献量98
段落导航相关论文