载在TiO_2上的V_2O_5是烃类氧化有活性和选择性的催化剂,许多作者对其物理化学性质和催化性能进行了研究,认为V_2O_5能在TiO_2表面上分散。北京大学物理化学研究所用X射线相定量等方法研究了某些催化剂活性组份在载体表面分散的自发倾向,对于比表面大的载体,活性组份晶相的消失或减少非常明显。X射线相定量通常需要有纯相标样,混合加入内标或参比物以测量X射线参比强度。无标样联立方程法不需用纯相标样和参比物,通过对不同含量的分析试样所建立的各相 V 2 O 5 supported on TiO 2 is an active and selective catalyst for the oxidation of hydrocarbons. Many authors have studied the physico-chemical properties and catalytic properties of V 2 O 5 and found that V 2 O 5 can disperse on the surface of TiO 2. The Peking University Institute of Physical Chemistry using X-ray phase quantitative methods such as the spontaneous tendency of some active components of the catalyst dispersed in the surface of the carrier, for the larger surface carrier, the disappearance or reduction of the active ingredient crystal phase is very obvious. X-ray phase quantitation usually requires a pure phase standard, mixed with an internal standard or reference to measure the X-ray reference intensity. The standard equation simultaneous equations does not require pure phase standard and reference material, through the analysis of different content of the sample established by the phase