Importance of Exsolution in Transition-Metal (Co, Rh, and Ir)-Doped LaCrO 3 Perovskite Catalysts for Boosting Dry Reforming of CH 4 Using CO 2 for Hydrogen Production

Joo Hyeng Oh, Byeong Wan Kwon, Jinwon Cho, Chan Hyun Lee, Min Kyeong Kim, Sun Hee Choi, Sung Pil Yoon, Jonghee Han, SukWoo Nam, Jin Young Kim, Seung Soon Jang, Ki Bong Lee, Hyung Chul Ham

Research output: Contribution to journalArticle

Abstract

LaCrO 3 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 CH 4 using CO 2 . One of the prepared perovskite-based catalysts, the LaCr 0.95 Ir 0.05 O 3-δ catalyst, showed the highest CH 4 conversion (81%) at 750 °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 LaCr 0.95 Ir 0.05 O 3-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 CH 4 . Density functional theory calculations revealed that the exsolution of a dopant Ir in LaCr 0.95 Ir 0.05 O 3-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.

Original languageEnglish
JournalIndustrial and Engineering Chemistry Research
DOIs
Publication statusPublished - 2019 Jan 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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