Effect of high-temperature hydrothermal treatment on Zn/S-1 catalytic properties of PDH reaction
In this paper,hydrothermal treatment of Zn-based Silicalite-1(S-1)catalyst at different temperatures was performed to explore the effect of high-temperature hydrothermal treatment on the cata-lyst and its propane direct dehydrogenation(PDH)performance.After high-temperature hydrothermal treatment,the propane conversion of the catalyst decreased from 68.49％to 1.42％.The samples were characterized by XRD,SEM,TEM,N2 physisorption,DR UV-vis,XPS,NH3-TPD,and Py-IR tech-niques.The results indicate that ZnO forms Zn-O-Si bonds with the S-1 molecular sieve and high-tempera-ture hydrothermal treatment disrupts the Zn-O-Si bonds,which results in the aggregation of ZnO particles and an increase in particle size.Simultaneously,the Lewis acid(L-acid)content decreases,leading to a decrease in the catalytic performance of the catalyst for the PDH reaction.
catalyst engineeringpropane direct dehydrogenationZnO nanoparticlesS-1 zeolitehigh-temperature hydrothermal treatment
万方数据
维普
