Partial oxidation of propane to synthesis gas over noble metals-promoted Ni/Mg(Al)O catalysts-High activity of Ru-Ni/Mg(Al)O catalyst

Masato Shiraga, Dalin Li, Ikuo Atake, Tetsuya Shishido, Yasunori Oumi, Tsuneji Sano, Katsuomi Takehira

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

Effect of the addition of small amount of noble metal, i.e. Ru, Rh, Pd, Ir or Pt, in the Ni/Mg(Al)O catalyst on the catalytic activity for the partial oxidation of propane has been investigated. Mg2.5(Ni0.5)-Al hydrotalcite was prepared by co-precipitation and was calcined to form Mg2.5(Al,Ni0.5)O periclase. When the powders of the periclase were dipped in an aqueous solution of the nitrate of Ru(III), Rh(III), Pd(II), Ir(III) or Pt(II), a reconstitution of the hydrotaclite took place on the surface of Mg2.5(Al,Ni0.5)O particles due to a "memory effect". The calcination followed by the reduction of the dipped samples produced highly dispersed noble metal-Ni supported catalysts. The loading of noble metal gave rise to a decrease in the reduction temperature of Ni2+ to Ni0 on Mg2.5(Al,Ni0.5)O periclase, an increase in the amount of H2 uptake on the Ni metal and moreover a decrease in the particle size of Ni metal formed on the noble metals-Ni/Mg2.5(Al)O catalyst. When the noble metals-Ni0.5/Mg2.5(Al)O catalysts were tested in the temperature-cycled operation of propane partial oxidation between 400 and 700 °C, the deactivation due to both Ni oxidation and coke formation on the catalyst was effectively suppressed by the loading of noble metals. The combination of Ru and Ni0.5/Mg2.5(Al)O was the most effective; the high sustainability against both Ni oxidation and coke formation was obtained only with 0.1 wt% of Ru loading. A dipping of 1.0 g of the powders of Ni0.5/Mg2.5(Al)O periclase in a 5 ml of Ru(III) nitrate-aqueous solution was enough to reconstitute the hydrotalcite on the surface of the powder particles, leading to the formation of the Ru-Ni bimetal loaded catalyst with the high activity as well as the high sustainability.

Original languageEnglish
Pages (from-to)143-154
Number of pages12
JournalApplied Catalysis A: General
Volume318
DOIs
Publication statusPublished - 2007 Feb 20

Keywords

  • H production
  • Hydrotalcite
  • Memory effect
  • Propane partial oxidation
  • Ru-Ni/Mg(Al)O catalyst

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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