Improvement of sulfur resistance of Pd/Ce-Zr-Al-O catalysts for CO oxidation

Haebin Shin, Minsung Baek, Youngsoo Ro, Changyeol Song, Kwan Young Lee, In Kyu Song

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Two kinds of mesoporous ceria-zirconia-alumina supports were prepared by a single-step epoxide-driven sol-gel method (SGCZA) and by a co-precipitation method (PCZA). Palladium catalysts supported on these materials were then prepared by a wet impregnation method (Pd/SGCZA and Pd/PCZA). The prepared catalysts were applied to the CO oxidation reaction before and after sulfur aging. XRD and N2 adsorption-desorption analyses revealed that these two catalysts retained different physicochemical properties. Pd/SGCZA had higher surface area and larger pore volume than Pd/PCZA before and after sulfur aging. TPR (Temperature-programmed reduction), CO chemisorption, FT-IR, and XPS analyses showed that the catalysts were differently influenced by sulfur species. Pd/SGCZA formed less sulfate and retained higher palladium dispersion than Pd/PCZA after sulfur aging. In the CO oxidation, Pd/PCZA showed better activity than Pd/SGCZA before sulfur aging. However, Pd/SGCZA showed higher CO conversion than Pd/PCZA after sulfur aging. We concluded that Pd/SGCZA was less poisoned by sulfur species than Pd/PCZA.

Original languageEnglish
JournalApplied Surface Science
DOIs
Publication statusAccepted/In press - 2017 Mar 20

Keywords

  • Ceria-Zirconia-Alumina
  • CO oxidation
  • Pd catalyst
  • Sulfur resistance

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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