Importance of Exsolution in Transition-Metal (Co, Rh, and Ir)-Doped LaCrO3 Perovskite Catalysts for Boosting Dry Reforming of CH4 Using CO2 for Hydrogen Production
- Importance of Exsolution in Transition-Metal (Co, Rh, and Ir)-Doped LaCrO3 Perovskite Catalysts for Boosting Dry Reforming of CH4 Using CO2 for Hydrogen Production
- 남석우; 윤성필; 한종희; 최선희; 함형철; 김진영; 조진원; 권병완; 이찬현; 오주형; 김민경; Seung Soon Jang; 이기봉
- Exsolution; Dry Reforming of CH4; Hydrogen Production
- Issue Date
- Industrial & engineering chemistry research
- VOL 58, NO 16-6393
- LaCrO3 perovskite and transition-metal (Co, Rh, Ir)-doped perovskite-based catalysts were fabricated using the Pechini method and applied to the dry reforming reaction of CH4 using CO2. One of the prepared perovskite-based catalysts, the LaCr0.95Ir0.05O3− δ catalyst, showed
the highest CH4 conversion (81%) at 750 °C via the preactivation of the catalyst with H2 gas. It also showed highly stable catalytic activity for 72 h without coke formation on the catalyst surface. Through X-ray photoelectron spectroscopy and transmission electron microscopy analyses, it is confirmed that the improved catalytic activity of the LaCr0.95Ir0.05O3− δ perovskite-based catalyst was based on the exsolution of Ir nanoparticles on the catalyst surface, which catalyzes the cleavage of the C− H bond for CH4. Density functional theory calculations revealed that the exsolution of a dopant Ir in LaCr0.95Ir0.05O3− δ is more exothermic with/without an oxygen vacancy condition by 1.01 eV/0.43 eV, which suggests the agglomeration of Ir on the surface.
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