SEARCH

SEARCH BY CITATION

Keywords:

  • acetoxylation;
  • antimony;
  • gas-phase reactions;
  • palladium;
  • X-ray diffraction

Abstract

The acetoxylation of toluene in the presence of acetic acid and oxygen was performed over a Pd[BOND]Sb/TiO2 catalyst at 210 °C and at various reaction pressures (1–10 bar). A remarkable improvement in the catalytic performance and a significant shortening of the induction period were found with an increase in pressure. At a pressure of 6 bar, the highest toluene conversion of 75 % and 100 % selectivity for benzyl acetate were observed. This result could be due to both the restructuring of the catalyst surface and to the formation of active Pd[BOND]Sb particles of desired size, composition, and shape during the course of the induction period. Samples of the most-active and spent catalysts were studied by ex situ and in situ XRD, XPS, and TEM.