464873 The Selective Production of Octene By the Metathesis of 1-Pentene
For the efficient production of octene by the metathesis of pentene-1, numerous catalyst system employed in this reaction includes Mo-based catalyst impregnated on γ-Al2O3, Mo-based monolith, MoO3/Al2O3 catalyst promoted by SiO2 activated by hν, and CO-precipitated MoO3/TiO2/ZrO2. In recent, rhenium-based catalysts had attracted much attention brcause of high activity and tolerance of impurities. It is well known that noble metal catalysts are shown high catalytic performance, but the high market price of noble metals renders their industrial application quite questionable. Therefore, it is more practical from an industrial standpoint to develop an improved non-novel metal-based catalyst.
One of the most problem in the metathesis reaction is deactivation of catalysts. The deactivation time is in the large od hours till several weeks depending on catalyst system and reaction conditions. The poisoning of active centre due to trace impurities in the feed components is one main cause od catalyst deactivation. Poisons of catalyst are mainly polar substances, e.g. water or oxygenates. Additionlly oxygen, organic bases and diene can lead to catalyst deactivation.
In this work, octene synthesis by the metathesis of pentene-1 was examined over a series of Re2O7/Al2O3 catalysts (Re2O7/ZnO/Al2O3, Re2O7/ZrO2/Al2O3, Re2O7/Al2O3/B2O3, Re2O7/V2O5/Al2O3) prepared by co-precipitation method at various pH conditions in a flow type fixed bed reactor to evaluate the catalyst performance. The effect of promoters on the performance of Re2O7/Al2O3 catalysts were investigated in detail, with an aim of enhancing catalytic activity and improving stability of the catalyst. N2O chemisorption experiments were conducted to investigate the copper surface area on the Re2O7/Al2O3 catalysts. Temperature programmed reduction (TPR) measurements were carried out to investigate copper dispersion and reducibility.
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