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首页> 外文期刊>Inorganica Chimica Acta >Well-defined lanthanum ethylenediaminetetraacetates as the precursors of catalysts for the oxidative coupling of methane
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Well-defined lanthanum ethylenediaminetetraacetates as the precursors of catalysts for the oxidative coupling of methane

机译:定义明确的乙二胺四乙酸镧作为甲烷氧化偶联催化剂的前体

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摘要

Water-soluble metal organic framework (MOF) complex [La5Cl2(edta)(3)(H2O)(18)](n)Cl-n.8nH(2)O (1) is converted to its nitrate or sulfate derivatives [La-2(NO3)(2)(edta)(H2O)(5)](n).3nH(2)O (2), [La-2(SO4)(edta)(H2O)(3)](n) (3) (H-4 edta = C10H16N2O8, ethylenediaminetetraacetic acid). The three well-defined complexes are further calcinated for the preparations of pure lanthanum oxides LaOCl, La2O2CO3 and La2O2SO4 or their mixtures respectively. The oxides from 1 to 2 show good catalytic performances for the oxidative coupling reaction of methane (OCM). Their conversions of methane and the selectivities to C-2 achieved 24.5%, 39.2% and 28.0%, 47.4% respectively at low temperature 550 degrees C, while the pure La2O2SO4 from 3 is not active at low temperature. The latter is contradict to the result by simple treatment of La-2(SO4)(3) reported previously. (C) 2015 Elsevier B.V. All rights reserved.
机译:水溶性金属有机骨架(MOF)络合物[La5Cl2(edta)(3)(H2O)(18)](n)Cl-n.8nH(2)O(1)转化为其硝酸盐或硫酸盐衍生物[La -2(NO3)(2)(edta)(H2O)(5)](n).3nH(2)O(2),[La-2(SO4)(edta)(H2O)(3)] [n )(3)(H-4 edta = C10H16N2O8,乙二胺四乙酸)。进一步煅烧这三种定义明确的配合物,分别制备纯镧氧化物LaOCl,La2O2CO3和La2O2SO4或它们的混合物。 1至2的氧化物对甲烷(OCM)的氧化偶联反应显示出良好的催化性能。在低温550℃下,它们的甲烷转化率和对C-2的选择性分别达到24.5%,39.2%和28.0%,47.4%,而来自3的纯La2O2SO4在低温下没有活性。后者与先前报道的La-2(SO4)(3)的简单处理结果相反。 (C)2015 Elsevier B.V.保留所有权利。

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