硝酸钾负载介孔炭催化光皮树油酯交换反应研究

doi:10.3969/j.issn.0253-2417.2021.06.011

Abstract

Abstract:

Using sucrose as the carbon source and SBA-15 as the mesoporous template, the CMK-3 mesoporous carbon was prepared by the hard template method. And then, the mesoporous carbon-based solid base catalyst by loading KNO₃ that could efficiently catalyze the production of biodiesel from Cornus wilsoniana oil was prepared by the impregnation method. Catalytic experiments were carried out to determine the catalytic activity of KNO₃/CMK-3 and explore the best preparation conditions by comparing the transesterification rate of biodiesel. The catalyst was characterized by SEM, TEM, BET, XRD, CO₂-TPD, etc.. The research results showed that the optimal loading conditions were calcination temperature 450 ℃, calcination time 2 h, loading amount of KNO₃ 7.5%. Under these conditions, the transesterification rate of biodiesel from C.wilsoniana oil could reach 95.95%. The catalyst 7.5%KNO₃/CMK-3 was characterized by SEM, TEM, BET, XRD, CO₂-TPD and so on, the results showed that the alkali content of the catalyst 7.5%KNO₃/CMK-3 was 0.921 1 mmol/g, the surface area was 93.95 m²/g, the total pore volume was 0.114 6 cm³/g and the pore size was 4.879 nm. Before and after the modification, the alkaline active molecule was loaded on the meso-carbon and the rodstructure of carbon skeleton remained stable. The FT-IR and GC-MS analysis results showed that the mass fractions of methyl linolenate and methyl oleate in the obtained biodiesel were the highest, and were 45.97% and 32.08%.

Key words: biodiesel, Cornus wilsoniana oil, transesterification reaction, solid base catalyst, CMK-3

CLC Number:

TQ35

Qin WANG, Hongmei WANG, Aihua ZHANG, Zhihong XIAO, Changzhu LI. KNO₃-Loaded Mesoporous Carbon Catalyzed Transesterification Reaction of Cornus wilsoniana Oil[J]. Chemistry and Industry of Forest Products, 2021, 41(6): 83-89.

Figures/Tables 9

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样品 sample	比表面积/(m²·g^-1) specific surface area	总孔容/(cm³·g^-1) total pore volume	孔径/nm pore size
CMK-3	500.25	0.4887	3.9075
7.5%KNO₃/CMK-3	93.95	0.1146	4.8790

峰号 No.	化合物名称 compound	相对峰面积% relative peak area
1	棕榈酸甲酯palmitic acid methylester	15.2466
2	棕榈油酸甲酯methyl palmitoleate	1.1679
3	硬脂酸甲酯methyl stearate	1.8278
4	油酸甲酯methyl oleate	32.0802
5	亚油酸甲酯methyl linolenate	45.9672
6	其他other	3.7102

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KNO₃-Loaded Mesoporous Carbon Catalyzed Transesterification Reaction of Cornus wilsoniana Oil

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KNO₃-Loaded Mesoporous Carbon Catalyzed Transesterification Reaction of Cornus wilsoniana Oil