From alumina modified Rh/Ce0.75Zr0.25O2-δ catalyst towards composite Rh/Ce0.75Zr0.25O2-δ-ƞ-Al2O3/FeCrAl catalytic system for diesel conversion to syngas

T. B. Shoynkhorova, P. V. Snytnikov, P. A. Simonov, D. I. Potemkin, V. N. Rogozhnikov, E. Y. Gerasimov, A. N. Salanov, V. D. Belyaev, V. A. Sobyanin

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15 Citations (Scopus)

Abstract

It was investigated how the modification of Ce1-xZrxO2–δ with alumina as structural additive affected the surface characteristics of the support. The effect of alkaline promoters on the catalyst coking resistance and activity was studied. Sorption-hydrolytic deposition technique was used to prepare a set of catalysts containing 1 wt.% Rh deposited on Al2O3 - Ce0.75Zr0.25O2-δ, Ce0.75Zr0.25O2-δ and Al2O3 - Ce0.75Zr0.25O2-δ, doped with alkaline metal. The catalysts were characterized by BET, TEM, SEM, XRD, TPO, and CO chemisorption methods. It was proved that the catalysts contained high-dispersion Rh particles of size 1–2 nm. The presence of Al deteriorated catalytic activity of Rh/ Al2O3 - Ce0.75Zr0.25O2-δ for steam reforming of diesel surrogate (n-hexadecane) at T = 550 °C, H2O/C = 3.0, GHSV = 20,000 h−1, whereas the alkaline additives promoted n-hexadecane steam reforming. Rh/Ce0.75Zr0.25O2-δ appeared to be the most stable catalyst, as it provided 100% conversion of n-hexadecane during 15 h on stream. The active component Rh/Ce0.75Zr0.25O2-δ was supported on FeCrAl alloy wire mesh using alumina as a binding structural component. The obtained catalyst Rh/Ce0.75Zr0.25O2-δ-ƞ-Al2O3/FeCrAl was tested in the autothermal reforming of n-hexadecane at various temperatures and gas flow rates. Operating conditions were found to provide a 100% conversion of n-hexadecane and stable catalyst activity.

Original languageEnglish
Pages (from-to)40-48
Number of pages9
JournalApplied Catalysis B: Environmental
Volume245
DOIs
Publication statusPublished - 15 May 2019

Keywords

  • Alumina
  • Autothermal reforming
  • Ceria-zirconia
  • Diesel
  • Hexadecane
  • Hydrogen-rich stream
  • Rhodium
  • Steam conversion
  • Structured catalyst
  • Syngas
  • Wire metal mesh
  • DEPOSITION
  • AL-BASED CATALYSTS
  • GAMMA-AL2O3 LAYERS
  • RH
  • FUEL
  • CERIA

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