Hu Shunyou, Wang Linlin, Chen Xiaopeng, Wei Xiaojie, Tong Zhangfa, Yin Lijiang
School of Chemistry and Chemical Engineering, Guangxi University Nanning 530004 P. R. China
Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology Nanning 530004 P. R. China.
RSC Adv. 2019 Feb 18;9(11):5978-5986. doi: 10.1039/c9ra00675c.
The concept of a solid catalyst coated with a thin ionic liquid layer (SCILL) was applied to the stereoselective hydrogenation of α-pinene. Nickel, a non-noble metal, was supported on a discarded fluid catalytic cracking catalyst (DF3C) and then modified with different loadings of the ionic liquid 1-ethanol-3-methylimidazolium tetrafluoroborate ([COHmim][BF]). The resulting catalysts showed a range of conversions and selectivities for the hydrogenation of α-pinene. The SCILL catalysts afforded -pinane with high selectivity and their activity depended on the ionic liquid loading. For an ionic liquid loading of 10 wt%, although the catalytic activity was suppressed, the selectivity and conversion could reach above 98% and 99%, respectively. In addition, the catalyst remained stable after 13 runs and the activity was almost unchanged with the conversion maintained at approximately 99%. Thus, the ionic liquid layer not only improved the selectivity for -pinane but also protected the active site of the catalyst and prolonged the service lifetime of the catalyst. The SCILL catalytic system provides an example of an ionic liquid catalytic system which eliminates organic solvents from the catalytic process.
将涂覆有薄离子液体层的固体催化剂（SCILL）概念应用于α-蒎烯的立体选择性氢化反应。将非贵金属镍负载在废弃的流化催化裂化催化剂（DF3C）上，然后用不同负载量的离子液体1-乙醇-3-甲基咪唑四氟硼酸盐（[COHmim][BF]）进行改性。所得催化剂对α-蒎烯氢化反应表现出一系列的转化率和选择性。SCILL催化剂能以高选择性生成蒎烷，其活性取决于离子液体的负载量。对于10 wt%的离子液体负载量，虽然催化活性受到抑制，但选择性和转化率分别可达到98%以上和99%以上。此外，该催化剂在运行13次后仍保持稳定，活性几乎不变，转化率维持在约99%。因此，离子液体层不仅提高了对蒎烷的选择性，还保护了催化剂的活性位点，延长了催化剂的使用寿命。SCILL催化体系提供了一个从催化过程中消除有机溶剂的离子液体催化体系实例。
