Abstract
The metathesis of 2-butene (Trans and Cis) to propene was investigated over W-based catalysts. Thermodynamic calculations for metathesis and isomerization were carried out at various temperatures to test the reactions. The results showed that the WO3/MCM-48 catalyst had good catalytic activity. The metathesis activity depended on the acidity of the catalyst and the dispersity of the WO3 on the supports. High temperatures promoted the isomerization of 2-butene to 1-butene. According to thermodynamic analysis, however, this is adverse to the metathesis reaction, making it important to determine an appropriate reaction temperature.
Highlights
Olefin metathesis, which is the reaction of olefin carbon–carbon double bond cleavage and intermolecular rearrangement to form new olefins, can convert low-value olefins to high-value olefins; for example, the by-product of 2-butene into propene of market demand [1] has great prospects in the petrochemical industry and in organic synthesis
Isomerization and metathesis of n-butene were studied over MgO and WO3 /MCM-48 catalysts
The results show that pressure had little effect on butene conversion; 16 wt.% WO3 /MCM-48 catalyst held the highest activity under the same conditions
Summary
Olefin metathesis, which is the reaction of olefin carbon–carbon double bond cleavage and intermolecular rearrangement to form new olefins, can convert low-value olefins to high-value olefins; for example, the by-product of 2-butene into propene of market demand [1] has great prospects in the petrochemical industry and in organic synthesis. Many olefin metathesis routes [6,7,8] have been reported to produce propene. We have reported a new propene synthesis route with 2-butene [9]. Mo-based catalysts, so metathesis reactions have to be performed in an inert atmosphere. The support material is one of the key factors influencing the performance of catalysts. WO3 -SiO2 -Al2 O3 metathesis catalysts were reported to be yielded by one-step preparation methods [14]. Wu et al [8] reported that tungsten incorporated ordered, mesoporous silicates as a metathesis catalyst. WO3 /SiO2 olefin metathesis catalysts were prepared by a one-pot aerosol-assisted Sol-gel method [16]. In order to know the effects of supports on the metathesis performance of catalysts, MCM-48, MCM-41 and SiO2 were used as supports. The experiments were carried out under different conditions and thermodynamic analyses
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