MoVSbO_x complex metal oxides are efficient catalysts for converting ethane to ethylene through oxidative dehydrogenation (ODE) reaction. Active sites containing V⁵⁺ are crucial to the catalytic performance of molybdenum-vanadium based catalysts. One of the main challenges of these catalysts lies in controlling active sites containing V⁵⁺ on the surface. In this work, a series of pure M1 phase MoVSbO_x catalysts with different surface contents of V⁵⁺ sites were prepared by hydrothermal and self-assembly methods. Their catalytic ODE performance was found to have a strong correlation with surface V⁵⁺, showing firstly an increase and then a substantial drop as a function of surface V⁵⁺ concentration on M1 phase MoVSbO_x catalysts. This may be attributable to the presence of different catalytic sites on the catalysts. The best catalyst synthesized by hydrothermal method has excellent reaction stability and gives 77.6 % ethane conversion and 64.1 % ethylene selectivity. The results of this study may be useful in developing highly efficient complex metal oxide catalysts for ODE.

MoVSbO _x复合金属氧化物是用于通过氧化脱氢（ODE）反应将乙烷转化为乙烯的有效催化剂。含V ^5+的活性位点对钼-钒基催化剂的催化性能至关重要。这些催化剂的主要挑战之一在于控制表面上含有V ^5+的活性位。本工作通过水热和自组装方法制备了一系列具有不同V ⁵⁺位表面含量的纯M1相MoVSbO _x催化剂。发现它们的催化ODE性能与表面V ⁵⁺有很强的相关性，首先显示出随表面V的变化而增加，然后大幅下降。在M1相MoVSbO _x催化剂上的浓度为⁵⁺。这可能归因于催化剂上存在不同的催化位点。通过水热法合成的最佳催化剂具有出色的反应稳定性，并能提供77.6％的乙烷转化率和64.1％的乙烯选择性。这项研究的结果可能对开发用于ODE的高效复合金属氧化物催化剂很有用。