Highly dispersed Rh-, Pt-, Ru/Ce0.75Zr0.25O2–δ catalysts prepared by sorption-hydrolytic deposition for diesel fuel reforming to syngas

• Published in: Applied catalysis. B, Environmental Vol. 237; pp. 237 - 244
• Main Authors: Shoynkhorova, T.B., Simonov, P.A., Potemkin, D.I., Snytnikov, P.V., Belyaev, V.D., Ishchenko, A.V., Svintsitskiy, D.A., Sobyanin, V.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.12.2018
• Subjects: Ceria-zirconia; Diesel autothermal reforming; Hydrogen-rich stream; Rhodium catalysts; Steam conversion of hexadecane; Syngas; Rhodium catalysts; Ceria-zirconia; Steam conversion of hexadecane; Diesel autothermal reforming; Hydrogen-rich stream; Syngas
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2018.06.003

[Display omitted] •Rh-, Pt-, Ru/Ce0.75Zr0.25O2–δ were prepared by sorption-hydrolytic deposition.•1–2-nm metal particles homogeneously spread over supports.•Rh catalyst surpassed Pt and Ru in hexadecane steam reforming.•Rh-based catalyst was active and stable in diesel steam and autothermal reforming. Three noble metal catalysts (Rh-, Pt-, Ru/Ce0.75Zr0.25O2–δ) for reforming of hydrocarbons were studied in steam and autothermal process conditions. Each catalyst was prepared by sorption-hydrolytic deposition with a metal loading of 0.1 mmol/g. The main idea of this technical approach was to form a solution of “metal complex + alkaline agent” that was metastable at given conditions (temperature, concentrations) with respect to homogeneous metal hydroxide precipitation, due to the kinetic inertness of the metal complexes for ligand exchange. As the support surface accelerated heterogeneous nucleation and growth of metal hydroxide particles, addition of the support to the reagent mixture initiated the hydrolysis which led to uniform depositing of 1–2 nm metal particles over the support surface. The Rh-based catalyst synthesized surpassed the Ru- and Pt-based catalysts in activity and stability in that under the experimental conditions, complete n-hexadecane conversion and equilibrium reformate product distribution were observed for 1-wt. % Rh/Ce0.75Zr0.25O2–δ for 17 h. This catalyst also showed competitive performance in autothermal reforming of diesel fuel providing stable operation for 9 h.