Role of support nature (γ-Al2O3 and S1O2-Al2O3) on the performances of rhenium oxide catalysts in the metathesis of ethylene and 2-pentene

Journal Of Natural Gas Chemistry, 2012, vol. 21, no2, pp. 158-164

Role of support nature (γ-Al₂O₃ and S₁O₂-Al₂O₃) on the performances of rhenium oxide catalysts in the metathesis of ethylene and 2-pentene

Phongsawat Weena (1) ; Netiworaruksa Benjamas (1) ; Suriye Kongkiat (2) ; Dokjampa Siraprapha (2) ; Praserthdam Piyasan (1) ; Panpranot Joongjai (1)

⁽¹⁾ Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, THAILANDE
⁽²⁾ SCG Chemicals CO., Ltd. 1 Siam Cement Rd., Bangsue, Bangkok 10800, THAILANDE

Abstract

Reports a study of the metathesis of ethylene and 2-pentene as an alternative route for propylene production over Re₂O₇/γ-Al₂O₃ and Re₂O₇/SiO₂-Al₂O₃ catalysts.

Both NH₃ temperature-programmed desorption (NH₃-TPD) and H₂ temperature-programmed reduction (H₂-TPR) results showed that Re₂O₇/SiO₂-Al₂O₃ exhibited stronger acidity and weaker metal-support interaction than Re₂O₇/γ-Al₂O₃. At 35—60 °C, isomerization free metathesis was observed only over Re₂O₇/γ-Al₂O₃, suggesting that the formation of metal-carbene metathesis active sites required only weak acidity.  Results suggest that on the Re₂O₇/SiO₂-Al₂O₃, hydrido-rhenium species ([Re]-H) were formed in addition to the metathesis active sites, resulting in the isomerization of the initial 1-butene product into 2-butenes. The results demonstrate the potential for high yield of propylene from alternative feedstocks.

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