Abstract:

The effect of different potassium (K) contents on the binding properties of a catalyst to the support and the catalytic oxidation of soot were investigated to develop a catalyst for efficient removal of soot particulate matter (PM) from diesel exhaust. K-based glassy ceramic coatings were prepared by sol-gel method using NiCrFe alloy corrugated foil as carrier. The commercial carbon black was substituted for the actual diesel soot by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) analysis and catalytic activity test to simulate the leaching of potassium ions escape speed. The results show that K-based glassy ceramic coating can effectively inhibit the leaching rate of K+ and improve the catalytic oxidation performance of the catalyst on soot. The (K₂O)_0.5(Al₂O₃)_0.5(SiO₂) yielded the best catalytic results and exhibited 90% of soot conversion at 540 ℃ under loose contact conditions.

Key words: diesel engines, catalytic oxidation, soot oxidation, glassy, microreactor