Effects of the preparation method on the crystallinity and catalytic activity of LaAlO3 perovskites for oxidative coupling of methane

Title
Effects of the preparation method on the crystallinity and catalytic activity of LaAlO3 perovskites for oxidative coupling of methane
Authors
하정명Gihoon LeeIlho KimInchan YangHyon Bin NaJi Chul Jung
Keywords
Perovskite catalyst; Preparation method; Crystallinity; Surface lattice oxygen; Methane conversion; Oxidative coupling
Issue Date
2018-01
Publisher
Applied surface science
Citation
VOL 429-61
Abstract
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 C2 compounds in OCM. Consequently, the C2 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 C2 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 C2 yield (ca. 12% at 750 °C) for OCM.
URI
http://pubs.kist.re.kr/handle/201004/66687
ISSN
0169-4332
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE