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Effects of Mg, Ca, Sr, and Ba Dopants on the Performance of La2O3 Catalysts for the Oxidative Coupling of Methane
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Metadata
Document Title
Effects of Mg, Ca, Sr, and Ba Dopants on the Performance of La2O3 Catalysts for the Oxidative Coupling of Methane
Author
Kiatsaengthong D, Jaroenpanon K, Somchuea P, Chukeaw T, Chareonpanich M, Faungnawakij K, Sohn H, Rupprechter G, Seubsai A
Name from Authors Collection
Affiliations
Kasetsart University; Kasetsart University; Kasetsart University; National Science & Technology Development Agency - Thailand; National Nanotechnology Center (NANOTEC); Kwangwoon University; Technische Universitat Wien
Type
Article
Source Title
ACS OMEGA
ISSN
2470-1343
Year
2022
Volume
7
Issue
2
Page
1785-1793
Open Access
Green Published
Publisher
AMER CHEMICAL SOC
DOI
10.1021/acsomega.1c04738
Format
Abstract
Oxidative coupling of methane (OCM) is a reaction to directly convert methane into high value-added hydrocarbons (C2+) such as ethylene and ethane using molecular oxygen and a catalyst. This work investigated lanthanum oxide catalysts for OCM, which were promoted with alkaline-earth metal oxides (Mg, Ca, Sr, and Ba) and prepared by the solution-mixing method. The synthesized catalysts were characterized using X-ray powder diffraction, CO2-programmed desorption, and X-ray photoelectron spectroscopy. The comparative performance of each promoter showed that promising lanthanum-loaded alkaline-earth metal oxide catalysts were La-Sr and La-Ba. In contrast, the combination of La with Ca or Mg did not lead to a clear improvement of C2+ yield. The most promising LaSr50 catalyst exhibited the highest C2+ yield of 17.2%, with a 56.0% C2+ selectivity and a 30.9% CH4 conversion. Catalyst characterization indicated that their activity was strongly associated with moderate basic sites and surface-adsorbed oxygen species of O-2(-). Moreover, the catalyst was stable over 25 h at a reactor temperature of 700 degrees C.
Industrial Classification
Knowledge Taxonomy Level 1
Knowledge Taxonomy Level 2
Funding Sponsor
National Research Council of Thailand (NRCT) [NRCT5-RSA63002-11]; Fundamental Fund, Thailand [FF(KU)21.65]; Kasetsart University Research and Development Institute (KURDI), Thailand; National Nanotechnology Center (NANOTEC), NSTDA, Ministry of Science and Technology, Thailand; Center of Excellence on Petrochemical and Materials Technology, Thailand; Austrian Science Fund (FWF) via SFB TACO [F81-P08]
License
CC BY
Rights
Authors
Publication Source
WOS