Catalysis science of supported vanadium oxide catalysts
Catalysis science of supported vanadium oxide catalysts
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DOI：
10.1039/c3dt50692d
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发表时间：
2013-01-01
影响因子：
4
通讯作者：
Wachs, Israel E.
中科院分区：
文献类型：
--
作者：
Wachs, Israel E.
负载型钒氧化物催化剂含有沉积在高表面积氧化物载体上的钒氧化物相（例如，例如，在一个实施例中，Al 2 O3、SiO2、TiO 2等）并且在化学、石油和环境工业中发现了作为氧化催化剂的广泛应用。本文综述了负载型钒氧化物催化剂的研究进展，重点介绍了这类新型催化材料的基本性质（分子结构、电子结构、表面化学和结构-反应性关系）。通过应用现代原位表征技术（拉曼、IR、UV-vis、XANES、EXAFS、固态V-51 NMR和同位素氧交换）确定了负载的钒氧化物相的分子和电子结构。表征研究表明，负载的氧化钒相由分散在氧化物载体上的二维表面氧化钒位点组成。相应的表面化学和反应性研究表明，表面的氧化钒中心是催化剂的氧化反应的催化活性中心，通过负载氧化钒催化剂。表征和反应性研究的组合表明，氧化物载体控制表面氧化钒位点的氧化还原性质，其可以变化多达类似于10（3）的因子。
Supported vanadium oxide catalysts contain a vanadium oxide phase deposited on a high surface area oxide support (e. g., Al2O3, SiO2, TiO2, etc.) and have found extensive applications as oxidation catalysts in the chemical, petroleum and environmental industries. This review of supported vanadium oxide catalysts focuses on the fundamental aspects of this novel class of catalytic materials (molecular structures, electronic structures, surface chemistry and structure-reactivity relationships). The molecular and electronic structures of the supported vanadium oxide phases were determined by the application of modern in situ characterization techniques (Raman, IR, UV-vis, XANES, EXAFS, solid state V-51 NMR and isotopic oxygen exchange). The characterization studies revealed that the supported vanadium oxide phase consists of two-dimensional surface vanadia sites dispersed on the oxide supports. Corresponding surface chemistry and reactivity studies demonstrated that the surface vanadia sites are the catalytic active sites for oxidation reactions by supported vanadia catalysts. Combination of characterization and reactivity studies demonstrate that the oxide support controls the redox properties of the surface vanadia sites that can be varied by as much as a factor of similar to 10(3).