545370 Effect of the Modification of Pd/CeO2 Catalyst on Steam Reforming of Methane at Low Temperature in an Electric Field

Monday, June 3, 2019
Texas Ballroom Prefunction Area (Grand Hyatt San Antonio)
Ayako Takahashi, Reona Inagaki, Takuma Higo, Shuhei Ogo and Yasushi Sekine, Applied Chem., Waseda Univ., Tokyo, Japan

These days, hydrogen atracts a lot of attention as a clean secondary energy taking the place of petroleum because only water is emitted from the combustion of hydrogen. Hydrogen demand is expected to increase from the viewpoint of environmental protection and an increasing use of fuel cell for vehicles or home systems. Methane steam reforming (MSR) is a primary process to produce hydrogen. Generally, this reaction is conducted at high temperature over 923 K because of the thermodynamic equilibrium and the stability of methane molecule. Such high temperature catalytic processes cause many problems such as sintering of catalyst, damage to plants, necessity for multi-heat exchangers and discarding low-temperature waste heat (under 500 K). Especially, heat loss leads to a decline in energy efficiency. Therefore, it is required to utilize effectively low-temperature waste heat. According to that, the new MSR catalytic process which proceeds at low temperature is demanded.

We have investigated a new reaction process, catalytic reaction in an electric field (Electreforming). MSR proceeds even at 473 K by applying electric field. Furthermore, the results indicated that the proton hopping via adsorbed water by Grotthuss mechanism emerged on the catalyst in the electric field, and it was revealed that the proton hopping promoted the dissociative adsorption of methane, the rate-limiting step of MSR, by the collision of proton with methane.

 In this study, we investigated the effects of support on MSR activity of Pd supported catalysts in the electric field. MSR in the electric field was demonstrated using various CeO2-based support loaded Pd catalysts. The characteristics of CeO2 support were controlled by doping or loading of various metal oxides.

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