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首页> 外文期刊>Catalysts >Comparison of Catalytic Properties of Vanadium Centers Introduced into BEA Zeolite and Present on (010) V 2 O 5 Surface–DFT Studies
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Comparison of Catalytic Properties of Vanadium Centers Introduced into BEA Zeolite and Present on (010) V 2 O 5 Surface–DFT Studies

机译:钒中心催化性能的比较,并在(010)v 2 O 5表面DFT研究中的存在性质

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Vanadium-based catalysts, in which vanadium is present either as bulk V 2 O 5 or as isolated species, are active in numerous oxidation reactions. In the present study, vanadium speciation and the possibility of its introduction in various forms (V=O, V–OH, V(=O)(–OH)) into the structurally different crystallographic positions in BEA zeolite was considered by means of Density Functional Theory (DFT). Out of nine nonequivalent positions, T2 and T3 positions are the most preferred. The former may accommodate V=O or V–OH, the latter V–OH or V(=O)(–OH). The structural and electronic properties of all possible centers present in the BEA zeolite are then compared with the characteristics of the same species on the most abundant (010) V 2 O 5 surface. It is demonstrated that they exhibit higher nucleophilic character when introduced into the zeolite, and thus, may be more relevant for catalysis.
机译:基于钒的催化剂,其中钒作为体积V 2 O 5或分离的物质存在,在许多氧化反应中是活性的。在本研究中,通过密度考虑通过密度考虑将钒形状的各种形式(V = O,V-OH,V(= O)( - OH))以各种形式(V = O,V-OH,V(= O))( - OH))的可能性不同于BEA沸石中的结构不同功能理论(DFT)。在九个非平衡位置,T2和T3位置是最优选的。前者可以容纳V = O或V-OH,后者V-OH或V(= O)( - OH)。然后将BEA沸石中存在的所有可能中心的结构和电子性质与最丰富(010)V 2 O 5表面上相同物种的特性进行比较。证明它们在引入沸石时表现出更高的亲核特征,因此可以更相关的催化。

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