文献类型：期刊文献

英文题名：Guanidine-Functionalized Amphiphilic Silica Nanoparticles as a Pickering Interfacial Catalyst for Biodiesel Production

作者：Peng, Wenli[2,3];Hao, Ping[4];Luo, Jianhui[1];Peng, Baoliang[1];Han, Xia[2,3];Liu, Honglai[2,3]

机构：[1]CNPC, KLNC, RIPED, PetroChina, Beijing 100083, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[4]Shanghai Inst Measurement & Testing Technol, Shanghai 201203, Peoples R China

年份：2020

卷号：59

期号：10

起止页码：4273

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20201308364005);WOS:【SCI-EXPANDED(收录号:WOS:000526415600011)】；

基金：The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Nos 21878075, 91534103), the PetroChina Innovation Foundation (2017D-5007-0204), and the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (No. 51621002).

语种：英文

外文关键词：Soybean oil - Silica nanoparticles - Biodiesel - SiO2 nanoparticles - Ostwald ripening - Transesterification - Catalysis - Catalysts

摘要：A series of surface-modified SiO2 nanoparticles (NPs) were designed and prepared by combining a guanidine group (1,1,3,3-tetramethylguanidine [TMG]) as the base catalytic functionality and n-alkyl chains as the hydrophobic functionalities. These particles comprising either n-butyl, n-octyl, n-dodecyl, or n-hexadecyl chains (C-n-SiO2-TMG, n = 4, 8, 12, 16), can stabilize soybean oil-in-methanol Pickering emulsions, and be used as interfacial catalysts in the transesterification reaction for biodiesel production. It is shown that transesterification is possible in all emulsions stabilized by the C-8-SiO2-TMG catalyst. For the C-8-SiO2-TMG catalyst, the highest conversion of 66.7% is obtained at a catalyst concentration of 7 wt % after the reaction time of 5 h at 70 degrees C. The apparent activation energy (E'(a)) is estimated to be 26.8 kJ.mol(-1), leading to a high reaction rate. Interestingly, the most efficient catalyst is C-12-SiO2-TMG NPs with the balanced amphiphilicity and chain length, which can both improve the interfacial area and lower the transfer limitation.