| 초록 |
The dry reforming of methane (DRM; CH4 + CO2 → 2H2 + 2CO) is a good way to convert greenhouse gases to valuable synthesis gas. Ni-based catalysts have been studied for this reaction, however, the independent effect of Ni size and support have not been reported yet. In this study, designed catalyst in which the Ni nanoparticle size and support can be varied independently was synthesized. 2.6, 5.2, 9.0, 17.3 nm sized Ni nanoparticles were tested for DRM at 800 ˚C without a significant Ni size change, and different metal oxides of SiO2, Al2O3, MgO, ZrO2, TiO2 were tested with 5.2 nm of Ni nanoparticles. The effect of Ni size and support on CH4 or CO2 turnover frequency was evaluated separately. In result, Ni nanoparticles with a size of 2.6 nm showed 4.2 times higher CH4 turnover frequency than those with a size of 17.3 nm. Among various supports, Al2O3 showed 4.3 times higher CH4 turnover frequency than SiO2. The seperated observation of Ni size effect and support effect would contribute to effective catalytic system for methane dry reforming. |
