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首页> 外文期刊>Catalysis science & technology >An investigation on surface reactivity of Nb-doped vanadyl pyrophosphate catalysts by reactivity experiments and in situ Raman spectroscopy
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An investigation on surface reactivity of Nb-doped vanadyl pyrophosphate catalysts by reactivity experiments and in situ Raman spectroscopy

机译：通过反应性实验和原位拉曼光谱法调查了掺杂NB掺杂氧化钒酸盐磷酸盐催化剂的表面反应性

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摘要

The effect of Nb when used as a promoter for vanadyl pyrophosphate, the catalyst for the oxidation of n-butane to maleic anhydride, was investigated. By means of both reactivity experiments and in situ Raman spectroscopy, it was found that the promoting effect shown by Nb occurred already for a very low amount of it, i.e., for a V/Nb atomic ratio as high as 150. The main role of Nb was to accelerate the formation of a limited amount of δ-VOPO4 on the surface of vanadyl pyrophosphate, by prompting the oxidation of V~(4+) into V~(5+) under reaction conditions. On the other hand, the presence of Nb concentrations higher than the optimal amount led to the generation of an undesired excess quantity of VOPO4 and the formation of α_(11)-VOPO4, as well as having a detrimental effect on the catalytic behavior.
机译：研究了NB用作钒基焦磷酸盐的启动子时的作用，即N丁烷氧化为马来酸酐的催化剂。 通过反应性实验和原位拉曼光谱法，发现NB所显示的促进效应已经出现在非常低的量，即V/NB原子比率高达150。 NB是通过在反应条件下促使V〜（4+）将V〜（4+）氧化成V〜（5+）的氧化剂表面上加速有限量的δ-VOPO4。 另一方面，NB浓度的存在高于最佳量导致产生不需要的过量量VOPO4和α_（11）-VOPO4的形成，并对催化行为产生不利影响。

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