Operando Molecular Spectroscopy and Catalysis Laboratory, Department of Chemical Engineering, Lehigh University, Bethlehem, PA 18015, USA.
Dalton Trans. 2013 Sep 7;42(33):11762-9. doi: 10.1039/c3dt50692d.
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 (51)V 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 ~10(3).
负载型氧化钒催化剂包含沉积在高表面积氧化物载体（如 Al2O3、SiO2、TiO2 等）上的氧化钒相，已在化学、石油和环境等行业中广泛用作氧化催化剂。本综述聚焦于这一新型催化材料（分子结构、电子结构、表面化学和结构-反应性关系）的基础方面。负载型氧化钒相的分子和电子结构通过现代原位表征技术（拉曼、红外、紫外-可见、XANES、EXAFS、固态（51）V NMR 和同位素氧交换）来确定。表征研究表明，负载型氧化钒相由分散在氧化物载体上的二维表面钒酸根组成。相应的表面化学和反应性研究表明，表面钒酸根是负载型氧化钒催化剂氧化反应的催化活性位。表征和反应性研究的结合表明，氧化物载体控制着表面钒酸根的氧化还原性质，其可变化高达约 10（3）倍。
