Reduction of the Phillips catalyst by various olefins: Stoichiometry, thermochemistry, reaction products and polymerization activity

Reduction of the Phillips catalyst by various olefins: Stoichiometry, thermochemistry, reaction products and polymerization activity
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各种烯烃对菲利普斯催化剂的还原:化学计量、热化学、反应产物和聚合活性

DOI:
10.1016/j.jcat.2016.10.031
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发表时间:
2016
影响因子:
7.3
通讯作者:
McDaniel, Max P.
McDaniel, Max P.
中科院分区:
化学1区
文献类型:
--
作者:
Potter, Kelsey C.;Beckerle, Connor W.;Jentoft, Friederike C.;Schwerdtfeger, Eric;McDaniel, Max P.

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研究了乙烯和己烯在Cr(VI)/SiO_2上的吸附、反应和脱附行为通过热重法、差示扫描量热法和质谱法监测铬。Cr(VI)/SiO2与乙烯在200 °C的温度下的反应总是包括一些低聚反应,使得不可能确定初始氧化还原反应的化学计量。Cr(VI)/SiO2与1-己烯或环己烯在150 °C下的反应表明每个铬吸附一个烯烃的化学计量。反应热与烯烃氧化成醛或酮,或甚至氧化成羧酸或酯一致。氧化产物保留在表面上。表面产物的热脱附导致在265-285 ° C和390-415 °C的温度下CO2释放,副产物分别指示甲酸盐和乙酸盐物种的分解。还原铬(VI)与乙烯导致网站的氧化还原产物的热脱附后,乙烯聚合活性,而减少与己烯不产生活性位点的热脱附的产品。
The adsorption, reaction and desorption of ethylene or hexenes on Cr(VI)/SiO2containing 1 or 3 wt.% chromium were monitored by thermogravimetry, differential scanning calorimetry and mass spectrometry. Reaction of Cr(VI)/SiO2with ethylene at a temperature of 200 °C always included some oligomerization, making it impossible to identify the stoichiometry of the initial redox reaction. Reaction of Cr(VI)/SiO2with 1-hexene or cyclohexene at 150 °C indicated an adsorption stoichiometry of one olefin per chromium. Heats of reaction were consistent with oxidation of the olefin to an aldehyde or ketone, or even to a carboxylic acid or ester. Oxidation products were retained on the surface. Thermal desorption of surface products resulted in CO2evolution at temperatures of 265–285 and 390–415 °C, with the co-products indicating decomposition of formate and acetate species, respectively. Reduction of Cr(VI) with ethylene led to sites active for ethylene polymerization after thermal desorption of the redox products, whereas reduction with hexenes did not generate active sites irrespective of thermal desorption of products.
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