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 HyengKwon, Byeong WanCho, JinwonLee, Chan HyunKim, Min KyeongChoi, Sun HeeYoon, Sung PilHan, JongheeNam, Suk WooKim, Jin YoungJang, Seung SoonLee, Ki BongHam, Hyung Chul
Issue Date
2019-04
Publisher
AMER CHEMICAL SOC
Citation
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, v.58, no.16, pp.6385 - 6393
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.
Keywords
FUEL-CELLS; OXIDE CATALYSTS; METHANE; NICKEL; TEMPERATURE; COMBUSTION; ETHANOL; OXYGEN; Exsolution; Dry Reforming of CH4; Hydrogen Production
ISSN
0888-5885
URI
https://pubs.kist.re.kr/handle/201004/120184
DOI
10.1021/acs.iecr.8b05337
Appears in Collections:
KIST Article > 2019
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