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Supported two- and three-dimensional vanadium oxide species on the surface of beta-SiC

机译：支持2 - 3三维钒表面氧化物种beta-SiC

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A series of supported two-and three-dimensional vanadium oxide surface species on beta-SiC with various V coverages are prepared via incipient wetness impregnation and characterized by a variety of ex and in situ techniques. The oxidative dehydrogenation of propane (ODHP) is also used as a probe reaction to complementarily distinguish between two- and three-dimensional VOx surface species. Herein, we show that treating pristine beta-SiC with oxygen transforms the existing amorphous SiOxCy surface layer into a more SiO2-type layer, though with a negligible formation of Si-OH sites, which initially were expected to be the anchor sites for VOx species. In its place, the C-OH functional groups identified by X-ray photoelectron spectroscopy (XPS) act as anchor sites for the VOx species during the impregnation process, and are consumed as a function of V coverage. Our experimental observations all corroborate the formation of two- and three-dimensional VOx species on the surface of beta-SiC.
机译：一系列支持三钒氧化物表面物种beta-SiC各种V保险通过初期的准备湿润浸渍和特征各种各样的交货和原位技术。丙烷氧化脱氢(ODHP)也用作探针反应配套区分两个——和三维VOx表面物种。与氧气治疗原始beta-SiC变换现有的非晶态SiOxCy表层更SiO2-type层,虽然可以忽略不计网站颗粒的形成,最初将锚为VOx的物种。取而代之的,哦官能团由x射线光电子能谱(XPS)作为锚的VOx的物种在浸渍过程中,消耗V的函数覆盖。观察所有确证的形成2 - 3三维VOx物种beta-SiC表面。

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