Sulfur promoted Pt/SiO 2 catalyzed cross-coupling of anilines and amines

Ken Ichi Shimizu, Katsuya Shimura, Naoko Tamagawa, Masazumi Tamura, Atsushi Satsuma

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Pt/SiO 2 (Pt = 5 wt%) catalysts with average Pt particle size of 3.3 and 6.8 nm and sulfur-loaded Pt/SiO 2 (S/Pt ratio = 0.1 and 0.13; Pt size = 5.2 and 5.5 nm), prepared by adding ammonium sulfate on Pt/SiO 2 followed by H 2-reduction at 500 °C, are tested for mono-N-alkylation of aniline with di-iso-propylamine. The turnover frequency (TOF), defined as the reaction rate per number of surface Pt species, increases with sulfur loading. The catalyst with S/Pt ratio of 0.13 shows more than 5 times higher TOF than unmodified catalysts, and it acts as effective and recyclable catalyst for cross-coupling of various anilines and amines. Combined with kinetic results and characterizations, XAFS (X-ray absorption fine structure), TEM, and CO adsorption IR, a possible reason for the promotion effect of sulfur species (probably sulfidic species) is discussed.

Original languageEnglish
Pages (from-to)37-42
Number of pages6
JournalApplied Catalysis A: General
Volume417-418
DOIs
Publication statusPublished - 2012 Feb 29

Keywords

  • Amines
  • Cross-coupling
  • Platinum
  • Sulfur

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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    Shimizu, K. I., Shimura, K., Tamagawa, N., Tamura, M., & Satsuma, A. (2012). Sulfur promoted Pt/SiO 2 catalyzed cross-coupling of anilines and amines. Applied Catalysis A: General, 417-418, 37-42. https://doi.org/10.1016/j.apcata.2011.12.019