Synthesis of ultra-low freezing point alkane by self-aldol condensation of n-butyraldehyde over MgO-SiO2catalyst followed by hydrodeoxygenation over Pd/C and HZSM-5 catalyst

被引:0
作者
Jiang, Zhenjing [1 ,2 ]
Wang, Wuyu [3 ]
Zhao, Xuelai [4 ]
Zhang, Xinghua [3 ]
Zhang, Qi [3 ]
Ma, Longlong [3 ]
机构
[1] Univ Sci & Technol China, Sch Energy Sci & Engn, Hefei 230026, Peoples R China
[2] Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China
[3] Southeast Univ, Sch Energy & Environm, Key Lab Energy Thermal Convers & Proc Control Meas, Minist Educ, Nanjing 210096, Peoples R China
[4] Anhui Univ Sci & Technol, Sch Chem & Blasting Engn, Huainan 233022, Peoples R China
基金
中国国家自然科学基金;
关键词
N-butyraldehyde; Aldol condensation; MgO-SiO2; Ultra-low freezing point; Jet fuel; SELECTIVE OXIDATION; MGO-SIO2; CATALYSTS; ETHANOL; HYDROGENATION; ACETALDEHYDE; PERFORMANCE; CONVERSION; BUTADIENE; BUTANOL; FUELS;
D O I
10.1016/j.biombioe.2024.107380
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
Production of jet fuel is not only promising but challenging in the field of biomass utilization. Here we proposed a novel route to produce highly branched alkanes with ultra-low freezing point using n-butyraldehyde as feedstock by self-aldol condensation and subsequent hydrodeoxygenation (HDO). The catalyst characterization revealed that the MgO-SiO2 catalyst played an acid-base synergetic effect role in the self-aldol condensation of n-butyraldehyde using n-butanol as solvent, which obtained C8 oxygenate and C12 oxygenate with yield of 69.3 % and 26.8 % respectively. The medium Br & oslash;nsted base site of the catalyst captured alpha-H to promote the formation of enolate from n-butyraldehyde, and the Lewis acid sites promoted the dehydration of intermediate products. DFT simulation showed that n-butanol activated alpha-C in enolate in aldol condensation, and deactivated the oxygen atoms in enolate by hydrogen bonds to inhibit side reactions. Finally, the obtained condensation products were subjected to HDO reaction over the 5 wt% Pd/C and HZSM-5 catalysts, obtaining the highly branched alkanes with an ultra-low freezing point of -120.7 degrees C for C8 alkane and -78.7 degrees C for C12 alkane suitable for bio-jet fuels.
引用
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页数:10
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