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首页> 外文期刊>Catalysis science & technology >Deoxydehydration of glycerol to allyl alcohol catalyzed by rhenium derivatives
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Deoxydehydration of glycerol to allyl alcohol catalyzed by rhenium derivatives

机译：甘油的脱氧脱氧于由rhenium衍生物催化的烯丙基醇

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The deoxydehydration (DODH) of glycerol is effectively catalyzed by rhenium derivatives, either in neat glycerol or in the presence of solvents (in particular alcohols), in air or under hydrogen bubbling. Methyltrioxorhenium (MTO) and ReO3 were the only rhenium catalysts tested that can selectively catalyze the DODH reaction at very low temperatures (140 °C). The presence of oxygen is not necessary, although under nitrogen the reaction requires higher temperatures to occur. On the other hand, the presence of hydrogen often noticeably increased the selectivity versus allyl alcohol formation, reaching the considerable value of 90% in the case of reaction conducted in 2,4-dimethyl-3-pentanol with ReO3. The DODH reaction always exhibits a definite induction time that, in the case of MTO, corresponds more or less to the time required for its demethylation. Metal catalysts in both high-likely rhenium(vi)-and low oxidation states are involved. Re-addition of fresh glycerol at the end of the reaction indicates the feasibility of the reuse of the catalysts.
机译：甘油的脱氧脱水（DODH）通过巧合衍生物有效地催化，无论是在纯甘油还是在溶剂（尤其是醇）的存在下，在空气中或在氢气中。甲基三氧甲烷（MTO）和REO3是唯一测试的rhenium催化剂，可以在非常低的温度（140°C）下选择性地催化DODH反应。尽管在氮中反应需要更高的温度，但不需要氧气的存在。另一方面，氢的存在通常显着提高了选择性与烯丙基醇形成，在2,4-二甲基-3-戊醇与REO3中进行反应的情况下达到了90％的相当值。 DODH反应总是表现出明确的诱导时间，在MTO的情况下，它或多或少地对应于其脱甲基所需的时间。涉及两种高率rhenium（VI）和低氧化态的金属催化剂。反应结束时新鲜甘油的重新吸收表明催化剂的再利用可行性。

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