Oxidative dimerization of methane over magnesium and calcium oxide catalysts promoted with Group IA ions: the role of [M+O-] centers
Oxidative dimerization of methane over magnesium and calcium oxide catalysts promoted with Group IA ions: the role of [M+O-] centers
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DOI：
10.1021/ja00250a009
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发表时间：
1987-08
影响因子：
15
通讯作者：
C. Lin;Tomoyasu Ito;Ji-Xiang Wang;J. Lunsford
中科院分区：
文献类型：
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作者：
C. Lin;Tomoyasu Ito;Ji-Xiang Wang;J. Lunsford
MgO和CaO上CH/sub 4/向C/sub 2/H/sub 4/和C/sub 2/H/sub 6/的氧化二聚反应受某些IA族离子作为促进剂的强烈影响。锂是MgO的有效促进剂，但钠和钾不是;所有三种IA族离子都是CaO的有效促进剂。在每种活性和选择性催化剂中存在（M/sup +/O/sup -/）类型的中心（M/sup +/是主要的IA族离子），这支持了这些中心对于形成CH/sub 3//sup ./自由基，因此，在整个氧化二聚反应。
The oxidative dimerization of CH/sub 4/ to C/sub 2/H/sub 4/ and C/sub 2/H/sub 6/ over MgO and CaO is strongly influenced by certain group IA ions which are employed as promoters. Lithium is an effective promoter for MgO, but sodium and potassium are not; all three group IA ions are effective promoters for CaO. Centers of the type (M/sup +/O/sup -/) (M/sup +/ is a substantial group IA ion) are present in each active and selective catalyst, which supports the hypothesis that these centers are active for the formation of CH/sub 3//sup ./ radicals and, therefore, in the overall oxidative dimerization reaction.