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Effects of Polyvinylpyrrolidone on the Preparation of Supported La 2 O 3 Catalysts by a Modified Impregnation Method for the Oxidative Coupling of Methane
Author(s) -
Hou YuHui,
Lin YinLiang,
Li Qi,
Weng WeiZheng,
Xia WenSheng,
Wan HuiLin
Publication year - 2013
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201300667
Subject(s) - polyvinylpyrrolidone , catalysis , oxidative coupling of methane , dispersion (optics) , methane , yield (engineering) , base (topology) , materials science , chemical engineering , chemistry , inorganic chemistry , polymer chemistry , organic chemistry , composite material , optics , engineering , mathematical analysis , physics , mathematics
The direct transformation of methane, such as oxidative coupling of methane (OCM), is a long‐standing challenge in methane utilization. Keeping this objective in mind, we explored the dispersion and acid–base effects of the catalysts on OCM. Herein, we prepared a series of La 2 O 3 /MgO catalysts by using a modified impregnation method with polyvinylpyrrolidone added to impregnated solutions. The BET, XRD, SEM, and TEM characterizations of the samples confirm that La 2 O 3 dispersion on MgO increases with the addition of polyvinylpyrrolidone and the particles become smaller in size and more uniform in distribution. High catalytic performances (e.g., the C 2 yield ≈16 %) of the well‐dispersed La 2 O 3 /MgO catalysts for OCM are demonstrated at a lower temperature (e.g., 550 °C) and a lower loading (e.g., 1.9 wt %). In addition, with the modification of acid–base properties of the supports, we find that base properties of the supports are responsible for C 2 formation and acidic properties of the supports are responsible for CO x formation. These properties establish a good correlation of the dispersion and basicity of the catalysts with the catalytic performances of the catalysts for OCM.