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·1904· 精细化工 FINE CHEMICALS 第 35 卷
表 4 Ni 2 Mg 2 Ga-LDH 在其他醇类化合物氧化反应中的性能 (3)Ni 2 Mg 2 Ga-LDH 在醇的选择性氧化反应中
Table 4 Catalytic oxidation of varied alcohols under Ni 2 Mg 2 Ga- 表现出较高的催化活性,优化条件下,苯甲醇的收
LDH
率达到 99%以上;重复使用 4 次后,催化剂的活性
序号 底物 产物 时间/h 收率/%
无明显下降。
1 4 91 (4)NiMgGa 类水滑石催化剂在芳香醇的选择
性氧化反应中具有较高的活性,而在脂肪醇的分子
2 24 95
氧氧化中活性较低。
3 16 85 参考文献:
[1] Wu Xingan (吴鑫干), Yin Juanjuan (尹娟娟), Hu Zaijun (胡在君).
4 1 >99
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7 24 85 [3] Liu Jie (刘杰), Zhou Weiyou (周维友), Wu Zhong (吴中), et al.
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9 4 >99
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在表 4 的氧化反应中,未发现其他产物。对于 oxidation[J]. Catalysis Letters, 2017, 147(1): 196-203.
苯甲醇衍生物,对位被给电子基团(序号 1~2)和 [6] Liu C, Wu Q, Peng J J, et al. Mesostructure controllable ZSM-5
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吸电子基团(序号 3~5)取代的底物均能顺利地氧 reusable catalysts for selective oxidation under aerobic conditions[J].
化成对应的醛,其中,对硝基苯甲醇表现出最高的 Journal of Porous Materials, 2017, 24(2): 297-303.
[7] Zhou W Y, Chen D W, Cui A J, et al. Aerobic oxidation of alcohols to
反应活性(序号 4),可能是由于硝基的强吸电性促
carbonyl compounds catalyzed by N-hydroxyphthalimide (NHPI)
进 O—H 键的活化。与苯甲醇类似,2-吡啶甲醇在 combined with CoTPP-Zn 2Al-LDH[J]. Journal of Chemical
反应 16 h 后转化率可达到 98%(序号 6)。对于邻位 Sciences, 2017, 129(3): 295-299.
[8] Zhou W Y, Pan J G, Wu Z, et al. Efficient catalytic oxidation of
取代的苯甲醇,其活性均有所降低(序号 7~8),可 alcohol to carbonyl compounds over CoFe hydrotalcites[J]. RSC
能是由于邻位基团影响了底物分子与催化剂表面的 Advances, 2016, 6(87): 84106-84112.
[9] Ma Shuai (马帅), Chen Zheng (陈郑), Wang Jiaxi (王家喜).
吸附。在 3-苯基-2-丙烯醇的氧化反应中,底物在 4 h
Preparation of GO doped Zn-Al LDHs supported palladium gold
内基本完全转化(序号 9)。然而,此催化体系在脂 catalysts and their catalytic performances[J]. Chemical Industry and
肪醇的氧化反应中,活性较低,反应 48 h 后,3, Engineering Progress (化工进展), 2017, 36(11): 4087-4092.
[10] Wang H, Shi Y Y, Masatake H, et al. Aerobic oxidation of benzyl
7-二甲基-6-辛烯-1-醇的转化率只有 8%(序号 10), alcohol in water catalyzed by gold nanoparticles supported on
这可能主要因为脂肪醇 α-H 的活性比芳香醇的低, imidazole containing crosslinked polymer[J]. Applied Catalysis A:
影响了氧化反应过程中 α-C—H 的断裂。 General, 2017, 536: 27-34.
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[12] Kawabata T, Shinozuka Y, Ohishi Y. Nickel containing Mg-Al
(1)采用共沉淀法制备了系列 Mg 改性的 NiGa hydrotalcite-type anionic clay catalyst for the oxidation of alcohols
with molecular oxygen[J]. Journal of Molecular Catalysis A:
类水滑石催化剂,结构表征结果表明样品均形成了 Chemical, 2005, 236(1/2): 206-215.
类水滑石结构。 [13] Sun F A, Zhou J C, Zhou W Y, et al. Efficient aerobic oxidation of
(2)Mg 的引入可以有效提高 NiGa 类水滑石 alcohols catalyzed by NiGa hydrotalcites in the absence of any
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催化剂表面碱性位的数量及其在醇分子氧氧化制醛 [14] Zhou W Y, Tao Q Y, Pan J G, et al. Effect of basicity on the catalytic
反应中的催化性能。与 Ni 2 Ga-LDH 相比,Ni 2 Mg 2 Ga- properties of Ni-containing hydrotalcites in the aerobic oxidation of
alcohol[J]. Journal of Molecular Catalysis A: Chemical, 2016, 425:
LDH 表面碱性位含量由 0.20 mmol/g 升至 0.26 mmol/g, 255-265.
苯甲醇的转化率由 91.6%提高至 99%。 (下转第 1941 页)