Sol–gel synthesis of ZrO2–SiO2 catalysts for the transformation of bioethanol and acetaldehyde into 1,3-butadiene

Abstract

A series of ZrO₂–SiO₂ catalysts synthesized by sol–gel method were investigated for the 1,3-butadiene formation from bioethanol and acetaldehyde. The influence of ZrO₂ content and reaction conditions on catalytic performance were studied. The catalysts were characterized by N₂ adsorption–desorption analysis, temperature-programmed desorption of NH₃ (NH₃-TPD), IR spectroscopy of adsorbed pyridine (Py-IR), Fourier Transform Infrared Resonance (FTIR), X-ray diffraction (XRD) and Transmission Electron Microscope (TEM). These characterization results indicated that suitable intensity of acid sites, especially Lewis acid, are very crucial to obtain an active catalyst. The catalysts showed significantly higher selectivity for C4 chemicals, and 2 wt% ZrO₂ content reached the highest selectivity to BD (69.7%), at space velocity (WHSV) of 1.8 h⁻¹.