SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2022, Vol. 44 ›› Issue (4): 351-362.DOI: 10.1016/j.cjche.2021.02.002

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Construction of a Brönsted-Lewis solid acid catalyst La-PW-SiO2/SWCNTs based on electron withdrawing effect of La(III) on π bond of SWCNTs for biodiesel synthesis from esterification of oleic acid and methanol

Qing Shu, Xinyuan Liu, Yanting Huo, Yuhui Tan, Caixia Zhang, Laixi Zou   

  1. School of Chemical and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
  • Received:2020-12-03 Revised:2021-02-03 Online:2022-06-18 Published:2022-04-28
  • Contact: Qing Shu,E-mail:shuqing@jxust.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (21766009), Program of Qingjiang Excellent Young Talents (Jiangxi University of Science and Technology). Thanks to Wang Tingting from the School of Foreign Languages, Jiangxi University of Science and Technology, for polishing the English grammar of this paper.

Construction of a Brönsted-Lewis solid acid catalyst La-PW-SiO2/SWCNTs based on electron withdrawing effect of La(III) on π bond of SWCNTs for biodiesel synthesis from esterification of oleic acid and methanol

Qing Shu, Xinyuan Liu, Yanting Huo, Yuhui Tan, Caixia Zhang, Laixi Zou   

  1. School of Chemical and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
  • 通讯作者: Qing Shu,E-mail:shuqing@jxust.edu.cn
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (21766009), Program of Qingjiang Excellent Young Talents (Jiangxi University of Science and Technology). Thanks to Wang Tingting from the School of Foreign Languages, Jiangxi University of Science and Technology, for polishing the English grammar of this paper.

Abstract: A novel solid Brönsted-Lewis acid catalyst La-PW-SiO2/SWCNTs (single-wall carbon nanotubes) was synthesized from the synergistic modification of H3PW12O40 (HPW) by single-walled carbon nanotubes functionalized with sidewall hydroxyl groups (SWCNTs–OH) and La3+ 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-SiO2/SWCNTs. The high catalytic activity and stability of La-PW-SiO2/SWCNTs can be attributed to the strong electron withdrawing effect of La3+ 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 Brönsted acid sites can be effectively reduced. La-PW-SiO2/SWCNTs can be an efficient and economical catalyst, because it shows good catalytic activity and stability.

Key words: Single-wall carbon nanotubes (SWCNTs), H3PW12O40, La3+, Solid Brönsted-Lewis acid catalyst, Biodiesel, Esterification

摘要: A novel solid Brönsted-Lewis acid catalyst La-PW-SiO2/SWCNTs (single-wall carbon nanotubes) was synthesized from the synergistic modification of H3PW12O40 (HPW) by single-walled carbon nanotubes functionalized with sidewall hydroxyl groups (SWCNTs–OH) and La3+ 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-SiO2/SWCNTs. The high catalytic activity and stability of La-PW-SiO2/SWCNTs can be attributed to the strong electron withdrawing effect of La3+ 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 Brönsted acid sites can be effectively reduced. La-PW-SiO2/SWCNTs can be an efficient and economical catalyst, because it shows good catalytic activity and stability.

关键词: Single-wall carbon nanotubes (SWCNTs), H3PW12O40, La3+, Solid Brönsted-Lewis acid catalyst, Biodiesel, Esterification