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Oxidative coupling of methane using non-stoichiometric lead hydroxyapatite catalyst mixtures

Authors
Park, Jai HyunLee, Dae-WonIm, Sung-WooLee, Yong HeeSuh, Dong-JinJun, Ki-WonLee, Kwan-Young
Issue Date
4월-2012
Publisher
ELSEVIER SCI LTD
Keywords
Natural gas; Partial oxidation; Oxidative coupling of methane; Ethylene; Lead hydroxyapatite
Citation
FUEL, v.94, no.1, pp.433 - 439
Indexed
SCIE
SCOPUS
Journal Title
FUEL
Volume
94
Number
1
Start Page
433
End Page
439
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/108836
DOI
10.1016/j.fuel.2011.08.056
ISSN
0016-2361
Abstract
Lead hydroxyapatite (PbxCa10-x(PO4)(6)(OH)(2), 0 < x <= 10) is one of the most active catalysts for oxidative coupling of methane (OCM) to produce ethane and ethylene from natural gas (methane). In this study, we investigated how the OCM activity of a precipitated lead hydroxyapatite is associated with its mixture and non-stoichiometric properties. Lead hydroxyapatite was prepared through aqueous precipitation in the presence of chlorine anions and calcination under helium background at 1073 K, which resulted in a mixture of non-stoichiometric lead hydroxyapatites, each having a different cationic composition (PbxCa10-x). The mixture could be diversified by extracting the chlorines thermally from the chloro-hydroxyapatites of various chlorine contents. The formation of an apatite structure was confirmed through Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), X-ray fluorescence (XRF) and inductively coupled plasma (ICP) analyses. The non-stoichiometric characters of the prepared hydroxyapatites were analyzed through Raman/FT-Raman spectroscopy. The C-2 selectivities of the prepared catalysts were evaluated at 1048 K with a fixed CH4 conversion of 35%. Among the tested catalysts, lead hydroxyapatite, which was obtained by removing chlorines from Pb2Ca8(PO4)(6)(OH)(0.5)Cl-1.5, showed a C-2 selectivity of 62%, and achieved a C-2 yield of 22% at 1048 K. The OCM activity of the catalyst was mainly associated with its surface basicity, which was investigated using CO2-temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) analyses. (C) 2011 Elsevier Ltd. All rights reserved.
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