Dissertation
Dissertation > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aromatic compounds > Aromatic hydrocarbons > Unsaturated side chain hydrocarbon > Styrene

Dehydrogenation of Ethylbenzene to Styrene over LaVOx/SBA-15 Catalysts in the Presence of CO2

Author ZuoGuo
Tutor LiuBingZuo
School Tianjin University
Course Physical and chemical
Keywords Ethylbenzene oxidative dehydrogenation styrene carbon dioxide LaVOx/SBA-15 catalyst vanadium -loading carbon deposition
CLC TQ241.21
Type Master's thesis
Year 2007
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Styrene is a very important raw materials in petrochemical engineering.It’s monomer was mainly produced by the catalytic dehydrogenation of ethylbenzene over K- doped(or Mg,Cr,Zn etc.) hematite catalyst at 600-700℃.Due to strong endothermic effect,a large amount of superheated steam is added in this process to reduce the reactant partial pressure and to avoid coke formation.Recently,CO2 as a mild oxidant has been investigated extensively for ethylbenzene dehydrogenation. In this articles,a series of LaVOx/SBA-15 catalysts with different vanadium loadings was investigated for the dehydrogenation of ethylbenzene to styrene in the presence of CO2.The introduction of La3+ has an effect of hindering carbon deposition and enhancing the stability of the catalysts.10%La2O3-15%V2O5/SBA-15(weight%) catalyst exhibited the best activity and stability,giving a styrene yield of 74%.The properties of the LaVOx/SBA-15 catalysts were characterized and the results of TPR and TG/DTG analysis confirmed that the activity of the catalyst could be attributed to the mono-dispersion of VO43- species and synergistic action of lanthanum and vanadium.The catalysts were characterized by small and wide angle XRD,BET,H2-TPR, CO2—TPD,FT-IR,TG-DTG.

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