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
- Authors
- Oh, Joo Hyeng; Kwon, Byeong Wan; Cho, Jinwon; Lee, Chan Hyun; Kim, Min Kyeong; Choi, Sun Hee; Yoon, Sung Pil; Han, Jonghee; Nam, Suk Woo; Kim, Jin Young; Jang, Seung Soon; Lee, Ki Bong; Ham, Hyung Chul
- Issue Date
- 24-4월-2019
- Publisher
- AMER CHEMICAL SOC
- Citation
- INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, v.58, no.16, pp.6385 - 6393
- Indexed
- SCIE
SCOPUS
- Journal Title
- INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
- Volume
- 58
- Number
- 16
- Start Page
- 6385
- End Page
- 6393
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/65970
- DOI
- 10.1021/acs.iecr.8b05337
- ISSN
- 0888-5885
- Abstract
- 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-delta catalyst, showed the highest CH4 conversion (81%) at 750 degrees C via the preactivation of the catalyst with H-2 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-delta 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-delta is more exothermic with/without an oxygen vacancy conditin by 1.01 ev/0.43 eV, which suggests the agglomentation of Ir on the surface.
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