Lee, Gihoon Kim, Ilho Yang, Inchan Ha, Jeong-Myeong Na, Hyon Bin Jung, Ji Chul 2024-01-19T23:32:46Z 2024-01-19T23:32:46Z 2021-09-03 2018-01-31 0169-4332 https://pubs.kist.re.kr/handle/201004/121787 Oxidative coupling of methane (OCM) was performed over three structurally different LaAlO3 perovskite catalysts prepared using the citrate sol-gel (LaAlO3_C), solid-state (LaAlO3_S), and hard-templating (LaAlO3_H) methods. Although three LaAlO3 perovskite catalysts were successfully prepared, the catalytic activity of the catalysts was significantly different depending on their preparation method. The preparation method, and thereby the crystallinity of the LaAlO3 perovskite catalysts, has a strong influence on the amount of surface lattice oxygen species, which play a key role in producing C-2 compounds in OCM. Consequently, the C-2 yield over LaAlO3 catalysts shows the same order as that shown by their relative crystallinity (LaAlO3_C > LaAlO3_S > LaAlO3_H). In other words, high crystallinity enabled LaAlO3 catalysts to retain a large amount of surface lattice oxygen species, resulting in a higher C-2 yield. Among the tested catalysts, LaAlO3_C, prepared using the citrate sol-gel method, retained the highest amount of lattice oxygen species owing to its high crystallinity and exhibited the highest C-2 yield (ca. 12% at 750 degrees C) for OCM. (C) 2017 Elsevier B.V. All rights reserved. English ELSEVIER CONVERSION SURFACE OXIDES NANOPARTICLES FUELS MG Effects of the preparation method on the crystallinity and catalytic activity of LaAlO3 perovskites for oxidative coupling of methane Article 10.1016/j.apsusc.2017.08.092 1 APPLIED SURFACE SCIENCE, v.429, pp.55 - 61 APPLIED SURFACE SCIENCE 429 55 61 scie scopus 000415228700010 2-s2.0-85028324760 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article CONVERSION SURFACE OXIDES NANOPARTICLES FUELS MG Perovskite catalyst Preparation method Crystallinity Surface lattice oxygen Methane conversion Oxidative coupling