545632 Combustion Suppression in Low-Temperature Electro-Catalytic Tri-Reforming of Methane over Ni-Mg Supported Catalysts

Wednesday, June 5, 2019
Texas Ballroom Prefunction Area (Grand Hyatt San Antonio)
Tomohiro Yabe, Kensei Yamada, Shuhei Ogo and Yasushi Sekine, Applied Chem., Waseda Univ., Tokyo, Japan

For reduction of automobile fuel consumption, a novel method for fuel reforming uses waste heat and exhaust gas components to regenerate the exhaust loss energy. We have investigated tri-reforming of CH4 (TRM) using H2O, CO2, O2, and CH4 as model gas. TRM comprises three reactions: CH4 steam reforming (SRM), CH4 dry reforming (DRM), and CH4 combustion (MC). To be suppressed to recover the enthalpy, SRM and DRM are expected to proceed preferentially to CH4 combustion (exothermic).

Recently, our group reported that Co-impregnated catalysts of Ni and Mg on La-ZrO2 (LZO) showed high reforming activity, suppressed CH4 combustion, and achieved enthalpy recovery at 473 K by applying an electric field.

In this study, to elucidate the causes of high reforming activity and CH4 combustion suppression over NiO-MgO co-supported catalysts in the TRM reaction in an electric field at 473 K, the reactivity and structure of NiO-MgO/LZO catalysts with or without an electric field was investigated using various experiments such as SRM activity and MC activity, and various characterization such as H2-TPR, XRD, XPS, XAFS. As a result, we found that Mg addition to 10wt%Ni/LZO catalyst suppresses methane combustion, while SRM proceeds well by virtue of surface protonics in the electric field. NiO-MgO solid solution formed on the support played an important role in combustion suppression. Ni2+ on 10wt%Ni/10wt%Mg/LZO catalyst was more cationic than that on 10wt%Ni/LZO catalyst.

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