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首页> 外文期刊>New Journal of Chemistry >Exploring and exploiting different catalytic systems for the direct conversion of cellulose into levulinic acid
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Exploring and exploiting different catalytic systems for the direct conversion of cellulose into levulinic acid

机译：探索和利用不同催化系统，将纤维素直转化为乙酰硫酸

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摘要

The conversion of cellulose into target chemicals is essential for the development of the sustainable chemical industry of the future. To this end, the single step transformation of cellulose into levulinic acid (LA) has been investigated in different aqueous systems and using either Bronsted acidic ILs, metal salts, or a mixture of these as catalysts with or without the formation of carbonic acid in situ. The effect of varying the reaction parameters, such as temperature, time, substrate concentration, and catalyst loading, on conversion and selectivity has been studied. A few different systems [(TMGH)(HSO4)-FeCl3 or (TMGH)(HSO4)-CrCl3 in H2O-CO2, (TMGH)(HSO4)-CrCl3 in H2O, FeCl3 in H2O, and FeCl3 or CrCl3 in H2O-CO2] allowed for the isolation of LA in good yields (41-55 mol%). The best and remarkably high yield of LA (69 mol%) has been obtained in water at 195 degrees C (4 h) by using TiOSO4 (0.375 wt%) as a catalyst. This new, environmentally friendly catalytic system retains high activity after five consecutive runs. Its catalytic activity has been discussed taking into account the hydrolysis process occurring under the reaction conditions.
机译：纤维素转化为目标化学品对于未来可持续化学工业的发展至关重要。为此，在不同的含水系统中研究了纤维素在紫胰酶（LA）中的单步转化，并使用刚性酸性ILs，金属盐或这些催化剂的混合物，或者没有形成碳酸原位。研究了改变反应参数的效果，例如温度，时间，底物浓度和催化剂负载，对转化和选择性进行了研究。几种不同的系统[（TMGH）（HSO4）-FECL3或（TMH4）（HSO4）-CRCL3在H2O-CO2，H2O，H2O中的H2O，FECL3中的（HSO4）-CRC13中，以及H2O-CO 2中的FECL3或CRCL3中的]允许以良好的产量（41-55mol％）分离洛杉矶。通过使用Tioso4（0.375wt％）作为催化剂，在195℃（4小时）中在水中获得最佳且显着的La（69mol％）。这种新的环保催化系统在连续五次运行后保留了高活动。考虑到在反应条件下发生的水解过程，已经讨论了其催化活性。

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