Based on a folded heat exchanger sheet design, we made a unique, small scale diesel particulate filter (DPF) that can transfer the heat generated in the DPF to the exhaust gas in the upstream of the DPF. By this function, the temperature of the inner part of DPF (position F in Fig. 1) was much more raised than the adiabatic temperature rise expected from the concentration of PM or H_2 artificially added for heating. With a maximum heat recovery rate of 87%, we succeeded in maintaining the inner temperature of DPF at around 500℃ and continuously removing more than 90% of PM, with a supply of only small amount of H_2.
