Modification by Nd, Mn, Ga, and Ge substantially affect both physicochemical and catalytic properties of MoVNbTeO oxides in the oxidative dehydrogenation of ethane (ODE). The introduction of modifying additives changes the content of the M1 phase, surface acidity, and surface composition. It does not have an influence on the state of Mo, V, Nb, and Te on catalyst surface, but it induces surface enrichment (Ga, Mn) or depletion (Ge, Nd) by the modifying element. All of these additives have positive effects on catalytic properties at the M/Mo (M = modifying element) ratio of 0.0075 ÷ 0.025. They exhibit an increase of activity and prevent ethylene over-oxidation. The relationship between the rate constant of total ethane transformation and the M1 content confirms that this phase is active in ODE. The correlation between ethylene selectivity and the relative number of intermediate acid sites is revealed, indicating the role of surface acidity on ethylene over-oxidation.

Nd，Mn，Ga和Ge的修饰在乙烷的氧化脱氢（ODE）中实质上影响MoVNbTeO氧化物的物理化学和催化性能。改性添加剂的引入改变了M1相的含量，表面酸度和表面组成。它对催化剂表面的Mo，V，Nb和Te的状态没有影响，但是会通过修饰元素引起表面富集（Ga，Mn）或耗尽（Ge，Nd）。在0.0075÷0.025的M / Mo（M =修饰元素）比下，所有这些添加剂均对催化性能产生积极影响。它们显示出活性增加并防止乙烯过度氧化。总乙烷转化率常数和M1含量之间的关系证实了该相在ODE中是有活性的。