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Propene oxidation on V_4O_(11)~- cluster: Reaction dynamics to acrolein

机译:V_4O_(11)〜-簇上的丙烯氧化:对丙烯醛的反应动力学

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摘要

Oxidation dynamics of propene (CH_3CH=CH_2) to acrolein (CH_2=CHCHO) on the anionic vanadium oxide cluster V _4O_(11)~- is investigated with the first-principle density functional calculations, providing an interpretation to V _4O_(11)~- + propene → V_4O _(10)H_2~- + C_3H_6O observed in the photochemical reactions (Li, S.; Mirabal, A.; Demuth, J.; W?ste, L.; Siebert, T. J. Am. Chem. Soc. 2008, 130, 16832). The complicated energy surface of the reaction between V_4O_(11)~- and propene is explored, and the stepwise dynamic processes for propene to acrolein are proposed. Initially, propene is captured by V_4O_(11)~- with a hydrogen bond CH (methyl group in propene) ···O (dioxo group in V_4O_(11)~-), then undergoes dehydrogenation along this hydrogen bond to form a π-allyl radical. After the redehydrogenation of the π-allyl and oxygen transfer from the vanadium oxide cluster, acrolein is eventually produced together with four isomers of V_4O_(10)H_2~- in the different reaction paths. During this process, the negative charge is found to transfer between the hydrocarbon and the vanadium oxide moieties.
机译:用第一性原理密度泛函计算研究了丙烯(CH_3CH = CH_2)在阴离子钒氧化物簇V _4O_(11)〜上氧化为丙烯醛(CH_2 = CHCHO)的动力学,为V _4O_(11)〜提供了解释-+丙烯→V_4O _(10)H_2〜-+ C_3H_6O在光化学反应中观察到(Li,S .; Mirabal,A .; Demuth,J .; W?ste,L .; Siebert,TJ Am.Chem.Soc (2008,130,16832)。探索了V_4O_(11)〜-与丙烯反应的复杂能量面,并提出了丙烯向丙烯醛的逐步动力学过程。最初,丙烯被具有氢键CH(丙烯中的甲基)···O(V_4O_(11)〜-中的二氧代基)的V_4O_(11)〜-捕获,然后沿该氢键脱氢形成π -烯丙基基团。 π-烯丙基的再加氢反应和氧钒团簇的氧转移后,丙烯醛最终与V_4O_(10)H_2〜-的四个异构体一起在不同的反应路径中生成。在该过程中,发现负电荷在烃和氧化钒部分之间转移。

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