Selective esterification of glycerol with acetic acid or lauric acid over rod-like carbon-based sulfonic acid functionalized ionic liquids
Selective esterification of glycerol with acetic acid or lauric acid over rod-like carbon-based sulfonic acid functionalized ionic liquids
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棒状碳基磺酸功能化离子液体上甘油与乙酸或月桂酸的选择性酯化
DOI：
10.1016/j.fuel.2017.06.073
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发表时间：
2017-11
期刊：
影响因子：
7.4
通讯作者：
Shang Qingkun
中科院分区：
文献类型：
--
作者：
Sun Yingnan;Hu Jianglei;An Sai;Zhang Qingqing;Guo Yihang;Song Daiyu;Shang Qingkun
通过水热制备的含氮碳纳米棒与1,3-丙磺酸内酯的季氨化，然后与三氟甲磺酸进行阴离子交换，制备了一系列具有可调布朗斯台德酸位密度的棒状含氮碳基磺酸功能化离子液体[PrSO3HN][SO3CF3]/C。该材料成功应用于甘油与乙酸或月桂酸的选择性酯化反应，生成三醋酸甘油酯、单月桂酸甘油酯、二月桂酸甘油酯等增值甘油酯。 [PrSO3HN][SO3CF3]/C 纳米棒优异的酯化活性很大程度上取决于其布朗斯台德酸性质；此外，形态特征、表面亲水性和柔性多环芳香碳结构也在一定程度上影响催化活性。具有高密度超强布朗斯台德酸位和完美棒状纳米结构的[PrSO3HN][SO3CF3]/C-2纳米棒表现出最高的酯化活性，其活性优于Amberlyst-15、丙磺酸功能化SBA-15、高温（600℃）煅烧得到的单键[PrSO3HN][SO3CF3]基团功能化碳质骨架以及均相对甲苯磺酸。此外，由于单键[PrSO3HN][SO3CF3]基团与碳骨架之间的化学相互作用，催化剂可以重复使用3次而不会显着降低活性。
A series of rod-like nitrogen-containing carbon-based sulfonic acid functionalized ionic liquids, [PrSO3HN][SO3CF3]/C, with tunable Brønsted acid site densities are fabricated by quaternary ammonization of hydrothermally prepared nitrogen-containing carbon nanorods with 1,3-propanesultone followed by anion exchange with trifluoromethanesulonic acid. The materials are successfully applied in the selective esterification of glycerol with acetic acid or lauric acid to the value-added glycerol esters including triacetain, glycerol monolaurate and glycerol dilaurate. The excellent esterification activity of the [PrSO3HN][SO3CF3]/C nanorods strongly depends on their Brønsted acid nature; additionally, the morphological characteristics, surface hydrophilicity and flexible polycyclic aromatic carbon structure influence the catalytic activity to some extent. The [PrSO3HN][SO3CF3]/C-2nanorod with high density of super strong Brønsted acid sites and perfect rod-like nanostructure exhibits the highest esterification activity, and its activity outperforms Amberlyst-15, propylsulfonic acid functionalized SBA-15, the single bond[PrSO3HN][SO3CF3] group functionalized carbonaceous framework obtained by high temperature (600 °C) calcination as well as homogeneousp-toluenesulfonic acid. Moreover, the catalyst can be reused three times without significant activity loss, attributing to the chemical interactions between the single bond[PrSO3HN][SO3CF3] groups and the carbon framework.
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