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• W2297407817 abstract "The self-metathesis of propylene by heterogeneous supported ReOx/Al2O3 catalysts was investigated with in situ Raman spectroscopy, isotopic switch (D–C3= → H–C3=), temperature-programmed surface reaction (TPSR) spectroscopy, and steady-state kinetic studies. The in situ Raman studies showed that two distinct surface ReO4 sites are present on alumina and that the olefins preferentially interact with surface ReO4 sites anchored at acidic surface sites of alumina (olefin adsorption: C4= > C3= > C2=). The isotopic switch experiments demonstrate that surface Re*═CH3 and Re*═CHCH3 are present during propylene metathesis, with Re* representing activated surface rhenia sites. At low temperatures (<100 °C), the rate-determining step is adsorption of propylene on two adjacent surface sites (rate ≈ [C3=][Re*]2. At high temperatures (>100 °C), the rate-determining step is the recombination of two surface propylene molecules (rate ≈ [C3=]2[Re*]). To a lesser extent, the recombination of surface Re*═CH3 and Re*═CHCH3 intermediates also contributes to self-metathesis of propylene at elevated reaction temperatures." @default.
• W2297407817 created "2016-06-24" @default.
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• W2297407817 date "2015-12-14" @default.
• W2297407817 modified "2023-09-23" @default.
• W2297407817 title "Reaction Mechanism and Kinetics of Olefin Metathesis by Supported ReO_<i>x</i>/Al₂O₃ Catalysts" @default.
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• W2297407817 doi "https://doi.org/10.1021/acscatal.5b02233" @default.
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