Load typed varadium catalyst and its preparing method and application

Abstract

A carried vanadium catalyst is prepared from activated carbon or gamma-Al2O3, vanadium and assistant through pulverizing activated carbon or gamma Al2O3 by 20-80 meshes, preparing the solutions of V precursor and assistant precursor, immersing for 18-36 hr, drying at 110-120 deg.c for 4-6 hrs, calcining at 450-650 deg.c for 4-5 hrs in nitrogen atmosphere and putting in drier. Its advantages are high transform rate of ethylbenzene (more than 60%) and high selectivity to styrene (more than 96%).

Description

Technical field:

[0001] The invention belongs to a catalyst for preparing styrene, in particular to the application of a supported vanadium oxide catalyst and the coupled reaction of ethylbenzene dehydrogenation to styrene. Background technique

[0002] Catalytic dehydrogenation of ethylbenzene is the main method to produce styrene, an important chemical raw material. Since this reaction is a strong endothermic reaction with increased number of molecules, the conversion rate is limited by thermodynamic balance, and high temperature (600-700° C.) and low pressure are favorable. In order to supply reaction heat and prevent coking of the catalyst in industry, a large amount of superheated steam needs to be introduced, which consumes a lot of energy and has low economic benefits. The development trend is to develop new catalysts and new processes with low temperature and low water ratio. In recent years, a new coupling process of ethylbenzene dehydrogenation and reverse water ...