Production of propylene from an unconventional metathesis of ethylene and 2-pentene over Re_2O_7/SiO_2-Al_2O_3 catalysts  

作　　者：Weena Phongsawat Benjamas Netivorruksa Kongkiat Suriye Siraprapha Dokjampa Piyasan Praserthdam Joongjai Panpranot 

机构地区：[1]Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University [2]SCG Chemicals CO., LTD. 1 Siam Cement Rd., Bangsue, Bangkok 10800, Thailand

出　　处：《Journal of Natural Gas Chemistry》2012年第1期83-90,共8页天然气化学杂志（英文版）

基　　金：supported by the financial supports from the Thailand Research Fund (TRF);the Office of Higher Education Commission;the NRU-CU(AM1088A)

摘　　要：An unconventional metathesis of ethylene and 2-pentene over Re2O7/SiO2-A1203 catalysts has been studied as an alternative route for the production of propylene. Complete conversion of 2-pentene and propylene yield as high as 88 wt% were obtained under mild reaction conditions at 35 ℃ and atmospheric pressure. Unlike the conventional metathesis of ethylene and 2-butenes in which isomerization is a competing side reaction, the isomerization of 1-butene product from the unconventional metathesis of ethylene and 2-pentene to 2-butenes can further react with excess ethylene in the feed, resulting in additional increase in propylene yield. The secondary metathesis reaction was found to be favored under ethylene/2-pentene （E/2P） molar ratio ≥3 and gas hourly space velocity （GHSV） ≤ 1000 h-1 at the reaction temperature of 35 ℃. No catalyst deactivation was observed during the 455 min time-on-stream under the selected reaction conditions.An unconventional metathesis of ethylene and 2-pentene over Re2O7/SiO2-A1203 catalysts has been studied as an alternative route for the production of propylene. Complete conversion of 2-pentene and propylene yield as high as 88 wt% were obtained under mild reaction conditions at 35 ℃ and atmospheric pressure. Unlike the conventional metathesis of ethylene and 2-butenes in which isomerization is a competing side reaction, the isomerization of 1-butene product from the unconventional metathesis of ethylene and 2-pentene to 2-butenes can further react with excess ethylene in the feed, resulting in additional increase in propylene yield. The secondary metathesis reaction was found to be favored under ethylene/2-pentene （E/2P） molar ratio ≥3 and gas hourly space velocity （GHSV） ≤ 1000 h-1 at the reaction temperature of 35 ℃. No catalyst deactivation was observed during the 455 min time-on-stream under the selected reaction conditions.

关 键 词：METATHESIS propylene production 2-pentene RHENIUM SILICA-ALUMINA 

分 类 号：O643.32[理学—物理化学]