Synthesis of vanadium-based catalysts and their excellent catalytic behaviors on dehydrogenation of C4 hydrocarbons

Ke Qiao,Zifeng Yan,Peng Peng,Peng Bai,Chao Hu

doi:10.1007/s13203-015-0118-x

Abstract

In this paper, vanadium-based catalysts made from commercial γ-alumina (V1 series) and from pseudo-boehmite (V2 series) were, respectively, prepared via impregnation method. The samples were characterized and evaluated by various characterization techniques (e.g. X-ray diffraction, N2 adsorption–desorption isotherms, ammonia temperature programmed desorption, and hydrogenation temperature programmed reduction) and dehydrogenation reactions, respectively. The results reveal that the most suitable loading amount of the V1 series of vanadium-based catalysts is 12 % and it is superior to the C4 olefin selectivity. On the other hand, the most suitable loading amount of V2 series of vanadium-based catalysts is 15 %, and this optimal catalyst has better dehydrogenation activity. The two series of samples are mainly composed of weak acid sites and V2 series of vanadium-based catalysts have larger specific surface area, larger pore volume, wider pore size, and better active component dispersion.

Highlights

With the rapid growth of oil refinery capacity, the production of C4 hydrocarbons, as by-products from FCC or hydrocracking, increases
The results reveal that the most suitable loading amount of the V1 series of vanadium-based catalysts is 12 % and it is superior to the C4 olefin selectivity
From the X-ray diffraction (XRD) patterns we can see that all samples show the characteristic peaks of c-Al2O3, which means that the phase of the supports in these two series of catalysts is c-Al2O3

Summary

Introduction

With the rapid growth of oil refinery capacity, the production of C4 hydrocarbons, as by-products from FCC or hydrocracking, increases. The results reveal that the most suitable loading amount of the V1 series of vanadium-based catalysts is 12 % and it is superior to the C4 olefin selectivity. The most suitable loading amount of V2 series of vanadium-based catalysts is 15 %, and this optimal catalyst has better dehydrogenation activity.

Results

Conclusion