Exhaust gas fuel reforming for hydrogen production with CGO-based precious metal catalysts

- CGO-based precious metal catalysts are investigated for exhaust gas reforming.
- Iso-octane and commercial gasoline primary test was investigated with Pt/CGO.
- For lower temperature operation, Me/CGO catalysts were investigated. (Me = Pt, Rh, Ru).
- Ru/CGO catalysts show better catalytic reforming performance at lower temperature, around 600 °C.

This paper investigated the fuel reforming of exhaust gases with Me/Ce0.9Gd0.1O3-d catalysts (Me = Pt, Rh, Ru). The reaction characteristics of the exhaust gas reforming reaction were evaluated by modifying certain reforming conditions, including the temperature, composition of the exhaust gas, hourly space velocity of the gas, and the amount of exhaust gas used. Using lean-burn exhaust gas, iso-octane and gasoline reforming were first investigated with a traditional liquid fuel reforming catalyst, Pt/CGO (0.5 wt.%). The highest yield of hydrogen was obtained when the exhaust gas ratio was approximately half the fuel ratio in this study. Moreover, the hydrogen yield was maximized at temperatures over 700 °C and a GHSV of approximately 10,000/h. In commercial gasoline tests, catalytic degeneration occurs under 700 °C, and carbon deposition occurs even with small deficiencies of the exhaust gas. Therefore, other precious metal catalysts were investigated for lower-temperature operation. In lower-temperature operation at approximately 600 °C, the Ru/CGO catalyst exhibited better performance in exhaust gas reforming than other noble metal catalysts.