Oxidation of 5-hydroxylmethylfurfural to 2, 5-furandicarboxylic acid catalyzed by magnetic MnO2-Fe3O4 composite oxides
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摘要: 以不同晶型的MnO2为催化剂进行5-羟甲基糠醛(HMF)氧化反应,并将催化活性较高的α-MnO2与Fe3O4复合制备磁性MnO2-Fe3O4复合氧化物,采用X射线衍射(XRD)、扫描电镜(SEM)、X射线光电子能谱(XPS)、NH3/CO2程序升温脱附(NH3/CO2-TPD)及吡啶吸附红外光谱(Py-FTIR)对催化剂的结构和性质进行表征和分析。结果表明,复合后的催化剂仍保持α-MnO2和Fe3O4基本结构,但催化剂中活性中心Mn4+·O2−离子对数量增加,使其对HMF氧化反应的催化活性相对α-MnO2和Fe3O4显著提升。对HMF氧化制备2,5-呋喃二甲酸(FDCA)的反应条件进行优化,复合催化剂Mn8Fe3Ox对HMF表现出良好的催化活性,在最优化条件下,HMF可完全转化,FDCA收率为76.9%。
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关键词:
- 5-羟甲基糠醛 /
- 氧化 /
- 磁性Mn-Fe复合氧化物 /
- 2,5-呋喃二甲酸
Abstract: MnO2 with different crystal structures was used to catalyze the oxidation reaction of 5-hydroxylmethylfurfural (HMF), and α-MnO2 exhibited the highest catalytic activity. Magnetic MnO2-Fe3O4 oxides were prepared by α-MnO2 and Fe3O4 and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), temperature programmed desorption of NH3/CO2 (NH3/CO2-TPD) and Fourier transform infrared reflection spectra of pyridine adsorption (Py-FTIR). The results showed that the composite catalyst still maintained the basic structure of α-MnO2 and Fe3O4, whereas the number of active center Mn4+·O2− ion pair increased compared with α-MnO2 and Fe3O4, which significantly improved the catalytic activity on HMF oxidation reaction. The reaction conditions of HMF oxidation to 2,5-furandicarboxylic acid (FDCA) were optimized. The composite oxide Mn8Fe3Ox showed the best catalytic performance for HMF oxidation. HMF could be completely converted, with 76.9% of FDCA yield under the optimal conditions. -
表 1 不同氧化物催化的HMF氧化反应
Table 1 Perfomance of different catalysts on oxidation of HMF
Catalyst Conversion/% HMFCA
/%DFF
/%FFCA
/%FDCA
/%Total yield/% − 40.5 4.1 10.2 7.8 0 22.1 α-MnO2 83.2 3.0 13.6 19.4 13.3 62.3 γ-MnO2 78.2 2.6 8.6 25.6 4.5 41.3 δ-MnO2 77.3 5.4 7.5 20.3 2.6 35.8 Fe3O4 76.8 2.6 20.1 30.1 5.4 58.2 Mn3Fe8Ox 86.8 3.2 20.1 39.4 14.6 75.3 Mn1Fe1Ox 89.5 4.8 19.8 35.7 15.4 75.7 Mn8Fe3Ox 97.3 5.4 18.7 43.8 23.6 91.5 表 2 催化剂的酸量和减量
Table 2 The acidity and basicity of various catalysts
Sample Acidity/(μmol·g−1) Basicity/(μmol·g−1) Fe3O4 416.0 6.1 MnO2 465.2 11.6 Mn8Fe3Ox 499.5 12.9 表 3 不同溶剂对HMF氧化反应的影响
Table 3 Influence of different solvents on oxidation of HMF
Solvent Conversion
/%HMFCA
/%DFF
/%FFCA
/%FDCA
/%Total yield
/%DMSO 97.3 5.4 18.7 43.8 23.6 91.5 MeCN 81.2 13.5 26.7 9.8 7.8 57.8 DMF 43.5 0.9 0.8 5.1 0 6.8 H2O 28.6 0 13.7 5.4 0 19.1 Ethanol 20.7 5.3 6.9 0.9 0 13.1 表 4 氧化剂和催化剂用量对HMF氧化反应的影响
Table 4 Influence of the dosage of oxidant and catalyst on HMF oxidation
Oxidant dosage
(equiv.)Catalyst dosage
/(g·mL−1)Conversion
/%DFF
/%FFCA
/%FDCA
/%Total yield
/%3.0 0.002 43.6 16.5 19.6 2.1 38.2 6.5 0.002 97.3 18.7 43.8 23.6 91.5 9.0 0.002 100 15.9 35.9 24.4 77.5 6.5 0.010 100 15.4 38.5 37.9 91.8 6.5 0.020 100 10.5 29.5 54.1 94.1 6.5 0.030 100 8.2 28.1 54.4 90.7 6.5 0.040 100 7.3 28.4 54.6 90.3 表 5 正交结果分析
Table 5 Analysis of orthogonal design
Entry Temp./℃ Time/h Oxidant dosage(equiv.) Catalyst dosage/(g·mL−1) FDCA/% 1 70 18 3.0 0.01 13.4 2 70 24 6.5 0.02 68.8 3 70 30 9.0 0.03 75.6 4 80 18 6.5 0.03 40.5 5 80 24 9.0 0.01 74.6 6 80 30 3.0 0.02 27.0 7 90 18 9.0 0.02 37.8 8 90 24 3.0 0.03 10.9 9 90 30 6.5 0.01 32.4 k1 52.6 30.6 17.1 40.1 k2 47.3 51.4 47.2 44.5 k3 27.0 45 62.7 42.3 R 25.6 20.8 45.6 4.4 表 6 Mn8Fe3Ox催化性能与文献报道其他催化剂比较
Table 6 Comparison of the catalytic activity of Mn8Fe3Ox with those of other heterogeneous catalysts reported in the latest literature
Catalyst Oxidants Base Temp./℃ Time/h Conversion/% FDCA/% Ref. Mn8Fe3Ox TBHP − 70 24 100 76.9 this work Au/TiO2 10 bar air 4 equiv. NaOH 130 5 100 84 36 Pd/Al2O3 1 bar O2 1.25 equiv. NaOH 90 8 > 99 78 37 Ru/AC 40 bar air 4 equiv. NaHCO3 100 2 100 75 38 Pt/C 40 bar air 2 equiv. Na2CO3 100 6 99 69 12 Nano-Fe3O4-CoOx TBHP − 80 12 100 68.4 21 Co-Mn-0.25 1 MPa O2 2 equiv. NaHCO3 120 5 99 95 22 1 MPa O2 2 equiv. NaHCO3 90 5 64 ± 3.6 4.6 ± 1.8 MnOx-CeO2 2 MPa O2 4 equiv. KHCO3 110 12 97.9 79.6 31 -
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