多孔膜反应器研究中几个问题的探讨

为了提高反应转化率,选择性透氢的多孔膜反应器已经被应用于水蒸气重整反应、水煤气转化反应和烃类脱氢反应等众多反应当中。本文首先介绍了无机多孔膜的种类、制备方法及其水热稳定性。随后对膜性能预评价实验的完善性进行探讨,包括氢在内所有反应物种蒸汽渗透性能都应该被考虑。与传统固定床反应器相比较,膜反应器移氢后反应区还原气氛减弱可能导致催化剂稳定性受到影响。值的注意的是,使用选择性透氢的膜反应器不仅可促进脱氢反应进行,同时对加氢反应也有明显抑制作用。

Problems in the application of porous membrane reactor

In order to improve the conversion of the reactions,hydrogen-selective porous membrane reactors had been used in a number of reactions,such as steam reforming,water gas shift and dehydrogenation of hydrocarbons.In this article,the types,preparation and hydrothermal stability of the inorganic porous membranes were described firstly.Then the improvement of the experimental pre-evaluation of membrane performances was discussed,and it was described that the vapor permeability of the reactants should be taken into account.At the same time,compared to the conventional reactors the membrane reactors had lower hydrogen concentration in them as hydrogen was removed by the membrane,so the stability of the catalysts in low hydrogen atmosphere should be re-evaluated.It was also point out that the removal of hydrogen from membrane reactor not only pushed the dehydrogenation reaction forward but also significantly inhibited the hydrogenation side reaction.