Effect of indium-modified palladium catalysts on the hydrodechlorination of 4-chlorophenol

Abstract

The influence of In addition on the activity and selectivity of supported Pd catalysts in the hydrodechlorination (HDC) of 4-chlorophenol (CP) was studied. The catalysts were characterized using temperature-programmed reduction, scanning electron microscopy, transmission electron microscopy, and hydrogen pulse chemisorption measurements. Bimetallic Pd–In/Al₂O₃ catalysts containing 1 wt% of Pd and with various In–Pd molar ratios were characterized by a high 4-CP conversion, which reached approximately 100% in a 2 h run. The results demonstrated that adding In to the Pd catalyst improved the dispersion of Pd particles and increased the HDC catalytic activity when the In–Pd molar ratio was less than 1/1.