中国炼油与石油化工 ›› 2021, Vol. 23 ›› Issue (3): 58-68.

• Catalyst Research • 上一篇    下一篇

双介孔TiO2-PTA/BMMS的合成及其光催化氧化脱硫性能研究

杨丽娜,张熙,崔莉程,徐美珍,李剑,   

  1. 辽宁石油化工大学化学化工与环境学部
  • 收稿日期:2020-12-27 修回日期:2021-07-14 出版日期:2021-09-30 发布日期:2021-09-27
  • 通讯作者: 李剑 E-mail:68336002@qq.com

Synthesis of Bimodal Mesoporous TiO2 -PTA/BMMS and its Enhanced Performance in the Photocatalytic Oxidative Desulfurization

Yang Lina; Zhang Xi; Cui Licheng; Xu Meizhen; Li Jian   

  1. School of Petrochemical Engineering, Liaoning Petrochemical University, Liaoning 113001
  • Received:2020-12-27 Revised:2021-07-14 Online:2021-09-30 Published:2021-09-27
  • Contact: Jian Li E-mail:68336002@qq.com
  • About author:Dr Yang Lina. Telephone: +86-13898311307; E-mail: jlqdsd@163.com School of Petrochemical Engineering, Liaoning Petrochemical University, Liaoning 113001

摘要: 为了提高TiO2的光催化氧化脱硫(PODS)活性,利用负载和复合的协同作用,将TiO2与磷钨酸 (PTA)复合,通过两步浸渍法合成制备了TiO2-PTA/BMMS。采用XRD、N2 吸附脱附、XRF、FTIR、UV-vis、SEM、EDS 和 TEM 对催化剂进行了表征;以含二苯并噻吩(DBT)的十二烷溶液为模拟油,评价了催化剂的催化性能。表征结果表明,PTA 的引入为双介孔载体提供更高的表面积和孔体积。在紫外光照射下,TiO2-PTA/BMMS在模拟反应体系中脱硫率可达到 99.6%,脱硫率远高于 TiO2/BMMS 脱硫率。同时对催化剂进行重复使用实验,重复八次后催化活性没有显着下降。

关键词: 磷钨酸, 双介孔硅, 二氧化钛, 光催化脱硫, UV照射, 二苯并噻吩

Abstract: Abstract: With the bimodal mesoporous silica (BMMS) acting as the support and the composite of TiO2 with phosphotungstic acid (PTA) functioning as the active constituent, TiO2-PTA/BMMS was synthesized by the two-step impregnation route. This catalyst was applied in the photocatalytic oxidative desulfurization (PODS) process, with the dibenzothiophene serving as the model sulfur compound. PODS proceeds in one pot, in which H2O2 acts as the oxidant and methanol plays the role of the solvent. TiO2-PTA/BMMS was characterized by XRD, N2 adsorption and desorption, XRF, FTIR, UV-vis, SEM, EDS and TEM techniques. It showed that the introduction of PTA contributes higher order, higher surface area and pore volume to the bimodal mesoporous support. With TiO2-PTA/BMMS used as the catalyst under the UV irradiation, the desulfurization rate can reach 99.6%. This result is obviously higher than that achieved by TiO2/BMMS. The catalyst also has no significant drop in catalytic activity after eight runs of reusing. In such catalytic system, the synergistic effects of this photocatalytic oxidation and the extraction with the methanol serving as the solvent played an indispensable role.

Key words: phosphotungstic acid, bimodal mesoporous silica, titanium dioxide, photocatalytic desulfurization, UV irradiation, dibenzothiophene