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The oxidative coupling of methane by sodium promoted lanthanide catalysts
Author(s) -
Wong Ningbew,
Tin Kamchung,
Zhu Qiming,
Zhang Meizhen,
Qiu Xianqing
Publication year - 1996
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199610)67:2<164::aid-jctb535>3.0.co;2-c
Subject(s) - catalysis , selectivity , oxidative coupling of methane , inorganic chemistry , alkaline earth metal , chemistry , methane , lanthanide , metal , sodium , alkali metal , organic chemistry , ion
The characteristics of La 2 O 3 catalysts with three different supports (BaCO 3 , MgO, and ZnO), two different alkaline metal promoters (Na 2 O and Na 2 CO 3 ), and a china clay have been investigated. The relationship of the surface basicity of the support to the activity and selectivity of the catalyst were studied by TPD. The results showed that the surface basicity of these three supports decreased in the following order: BaCO 3 > MgO > ZnO. The choice of Na 2 O as a promoter in La 2 O 3 /(BaCO 3 or MgO) had a better effect than the choice of Na 2 CO 3 . The Na 2 O promoter could increase not only the catalytic activity and the C 2 selectivity, but also lower the optimal reaction temperature. Addition of 15% clay into the La 2 O 3 –alkaline metal catalysts could increase the strength of the catalyst and lower the optimum reaction temperature.