Electricity-driven rapid regeneration of ceramic paper-based soot filters with conductive potassium-supported antimony-doped tin oxide catalyst

To address short-term emission of massive particulate matter (PM) from diesel engines, rapid regeneration of catalyzed diesel particulate filters (CDPF) based on soot combustion is a considerable challenge. Herein, we employed an aluminosilicate fiber-weaved ceramic paper (CP) as a filter matrix, on which highly active potassium-supported antimony-doped tin oxides (K/ATO) were coated to fabricate a CDPF. The K/ATO/CP monolith preserves the 3D-network structure of CP while incorporating the mesopores of K/ATO, providing potential for trapping soot particles effectively. Furthermore, electricity pulses are designed to pass through the conductive K/ATO coating on the monolith for CDPF regeneration, achieving nearly complete soot conversion within less than half a minute using 1400 J of energy input. Both the reaction rate and the energy efficiency surpass previously reported those of other methods for soot combustion. Mechanism studies revealed that the electricity pulse can stimulate the release of tremendous lattice oxygen from the catalyst and in turn trigger rapid soot combustion, and boost surface sulfate decomposition to alleviate SO2 poisoning. This work presents an electrification strategy to realize rapid regeneration of CDPF for effective PM elimination utilizing onboard electricity system for hybrid powers.