Construction of a Bronsted-Lewis solid acid catalyst La-PW-SiO_(2)/SWCNTs based on electron withdrawing effect of La(Ⅲ)onπbond of SWCNTs for biodiesel synthesis from esterification of oleic acid and methanol  

作　　者：Qing Shu Xinyuan Liu Yanting Huo Yuhui Tan Caixia Zhang Laixi Zou 

机构地区：[1]School of Chemical and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China

出　　处：《Chinese Journal of Chemical Engineering》2022年第4期351-362,共12页中国化学工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(21766009);Program of Qingjiang Excellent Young Talents(Jiangxi University of Science and Technology)。

摘　　要：A novel solid Bronsted-Lewis acid catalyst La-PW-SiO_(2)/SWCNTs(single-wall carbon nanotubes)was synthesized from the synergistic modification of H_(3)PW_(12)O_(40)(HPW)by single-walled carbon nanotubes functionalized with sidewall hydroxyl groups(SWCNTs–OH)and La^(3+) via sol–gel method.The freshly prepared catalyst was characterized by several methods,and the catalytic activity and stability of it were studied from the esterification of oleic acid and methanol.Results showed that the highest conversion of oleic acid was 93.1%(mass)and maintained as high as 88.7%(mass)after six cycles of La-PW-SiO_(2)/SWCNTs.The high catalytic activity and stability of La-PW-SiO_(2)/SWCNTs can be attributed to the strong electron withdrawing effect of La^(3+) on π bond of SWCNTs,because it can facilitate the formation of a large number of strong Lewis acid sites.Therefore,the reduction of catalytic activity of a solid acid catalyst due to the fact that hydration reaction of its Bronsted acid sites can be effectively reduced.La-PW-SiO_(2)/SWCNTs can be an efficient and economical catalyst,because it shows good catalytic activity and stability.

关 键 词：Single-wall carbon nanotubes(SWCNTs) H_(3)PW_(12)O_(40) La^(3+) Solid Bronsted-Lewis acid catalyst BIODIESEL ESTERIFICATION 

分 类 号：TE667[石油与天然气工程—油气加工工程] TQ426[化学工程]