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本文简要地介绍了丁烯氧化脱氢用钼酸铋催化剂研究中,关于催化剂制备因素的某些情况,混浆和浸渍两种催化剂的动力学考察结果和浸渍催化剂活性下降原因的分析等问题.动力学考察的初步结果表明,丁烯氧化脱氢反应可按一级动力学方程处理,并得出简化的反应历程及相应的动力学常数.对新鲜及失活催化剂的物化性质考察,似表明在实验室条件下催化剂中氧化钼在较小范围内的流失,并不导致活性下降,但在大型反应器中,在有利于氧化钼大量流失的条件下,催化剂在钼酸铋晶型的再结构和部分还原中,大量丧失表面积及其上的活性中心,活性有较大下降.文中并根据催化剂的顺磁共振等研究,推论了催化剂活性中心的性质,并提出了反应机理。
In this paper, the author briefly introduced the bismuth molybdate catalysts for the oxidative dehydrogenation of butylene. Some problems about the preparation of catalysts, the kinetics of mixing and impregnation, and the analysis of the reasons for the decrease of the activity of impregnated catalysts were also introduced. The preliminary kinetic results show that the oxidative dehydrogenation of butene can be treated according to the first-order kinetic equation, and the simplified reaction process and the corresponding kinetic constants are obtained. The physical and chemical properties of the fresh and inactivated catalysts seem to indicate Under laboratory conditions, the loss of molybdenum oxide in the catalyst in a relatively small range does not result in a decrease in activity. However, in large reactors, in favor of a large loss of molybdenum oxide, Structure and part of the reduction, a large number of loss of the surface area and the active center, the activity decreased significantly. According to the catalyst paramagnetic resonance and other studies, the nature of the catalyst activity center deduced, and proposed the reaction mechanism.