Spectroscopic surface characterization of MoVNbTe nanostructured catalysts for the partial oxidation of propane
Spectroscopic surface characterization of MoVNbTe nanostructured catalysts for the partial oxidation of propane
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DOI：
10.1016/j.cattod.2011.12.035
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发表时间：
2012-06
期刊：
影响因子：
5.3
通讯作者：
R. López-Medina;I. Sobczak;H. Golińska-Maźwa;M. Ziolek;M. Bañares;M. Guerrero-Pérez
中科院分区：
文献类型：
--
作者：
R. López-Medina;I. Sobczak;H. Golińska-Maźwa;M. Ziolek;M. Bañares;M. Guerrero-Pérez
本贡献的主要目的是分析组成、覆盖率和 Te 掺杂对负载型纳米级 MoVNb(Te)O 催化剂表面组成和催化行为的影响。不同的光谱技术结合起来可以实现这样的目标。通过拉曼光谱和紫外可见光谱研究了表面物质的组成，同时进行了多次吡啶吸附实验来量化催化剂表面的酸位数量。通过FTIR光谱结合丙烯的吸附研究了反应中间体的性质以及样品吸附它们的能力。结果表明，碲引起MoVNb催化材料的结构和催化性能的一些变化，提高了丙烷氧化反应过程中所需丙烯酸的反应产率。
The main objective of the present contribution is to analyze the effect of composition, coverage and Te doping in the surface composition and catalytic behavior of supported-nanoscaled MoVNb(Te)O catalysts. Different spectroscopy techniques combine to afford such objective. The composition of the surface species has been studied by Raman and UV–Vis spectroscopies, whereas it has been performed several pyridine adsorption experiments to quantify the number of acid sites on the surface of catalysts. The nature of reaction intermediates and the capability of the samples to adsorb them have been studied by FTIR spectroscopy combined with the adsorption of propene. The results have shown that tellurium induces several changes in the structure and catalytic properties of MoVNb catalytic materials, improving the reaction yield to the desired acrylic acid during the propane oxidation reaction.