Efficient catalysts for olefins from alkanes: sol–gel synthesis of high surface area nano scale mixed oxide clusters
Efficient catalysts for olefins from alkanes: sol–gel synthesis of high surface area nano scale mixed oxide clusters
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烷烃制烯烃的高效催化剂：高表面积纳米级混合氧化物簇的溶胶-凝胶合成
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
L. Lefferts
中科院分区：
文献类型：
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作者：
C. Trionfetti;I. Babich;K. Seshan;L. Lefferts
采用溶胶-凝胶法制备了低锂负载量的高比表面积纳米Li/MgO氧化物团簇。相当数量的锂可以在制备过程中并入氧化镁凝胶中，并在凝胶燃烧后保留在氧化物基质中。这限制了游离锂相的存在，并有助于防止在热处理过程中相关的烧结和表面积损失。溶胶-凝胶法还可以避免将锂引入氧化镁基质所需的高温处理，这是形成[Li+O−]型缺陷中心的先决条件，这些缺陷中心是烷烃氧化脱氢的催化活性中心。
High surface area nano scale Li/MgO oxide clusters with low lithium loadings are prepared by sol–gel method. Appreciable amounts of lithium present can be incorporated into the magnesia gel during preparation and retained in the oxide matrix after gel combustion. This limits presence of free lithium phases and helps prevent the associated sintering and loss of surface area during thermal treatments. The sol–gel method also allows to circumvent the high temperature treatments necessary to incorporate lithium into the magnesia oxide matrix, a prerequisite for the formation of [Li+O−] type defect sites which are the catalytically active sites for oxidative dehydrogenation of alkanes.