Page 156 - 《精细化工》2020年第12期
P. 156
第 37 卷第 12 期 精 细 化 工 Vol.37, No.12
2020 年 12 月 FINE CHEMICALS Dec. 2020
催化与分离提纯技术
芽孢杆菌辅助合成 TiO -SBA-15-W
2
光催化氧化脱硫催化剂
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1
1*
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杨丽娜 ,周婷婷 ,齐玉欢 ,郭永成 ,李 剑
(1. 辽宁石油化工大学 石油化工学院,辽宁 抚顺 113001;2. 中科合成油工程有限公司,北京 100020;
3. 中国石油抚顺石化分公司洗化厂,辽宁 抚顺 113001)
摘要:以正硅酸乙酯(TEOS)为原料,以芽孢杆菌(W)为辅助模板合成介孔分子筛 SBA-15-W,负载 TiO 2
后得到 TiO 2 -SBA-15-W 光催化氧化脱硫催化剂。采用 XRD、N 2 吸附-脱附、SEM、EDS、FTIR、XPS、UV-Vis
及 PL 对其进行结构表征。结果表明,芽孢杆菌的加入使 TiO 2 -SBA-15 的介孔有序度提高,孔径增大,催化剂吸
收紫外光的能力增强,光生电子-空穴复合率降低。以二苯并噻吩(DBT)为探针评价催化剂性能,结果表明,芽
孢杆菌含量为 1%(以 SiO 2 质量为基准,下同)的 TiO 2 -SBA-15-W 光催化剂性能较好,优化后反应条件为:催
化剂用量 1%(以模拟油质量为基准,下同),过氧化氢/模拟油中 n(O)∶n(S)=20∶1,V(萃取剂)∶V(模拟油)=1∶
1。在该条件下,光照 120 min 后,对模拟油的脱硫率达 90.6%,比 TiO 2 -SBA-15 提高了 11.8%。提出光催化氧
+
–
化脱硫(PODS)机理,认为超氧自由基(•O 2 )和空穴(h )是 PODS 的主要活性物种。
关键词:芽孢杆菌;TiO 2 ;SBA-15;光催化;氧化;脱硫;催化技术
中图分类号:O 643.36 文献标识码:A 文章编号:1003-5214 (2020) 12-2518-09
TiO 2-SBA-15-W photocatalytic oxidation desulfurization
catalysts synthesised with bacillus as auxiliary
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YANG Lina , ZHOU Tingting , QI Yuhuan , GUO Yongcheng , LI Jian
(1. School of Petrochemical Engineering, Liaoning Shihua University, Fushun 113001, Liaoning, China; 2. Synfuels
China Engineering Co., Ltd., Beijing 100020, China; 3. PetroChina Fushun Petrochemical Company of Washing Plant,
Fushun 113001, Liaoning, China)
Abstract: Mesoporous molecular sieve SBA-15-W was synthesized using ethyl orthosilicate (TEOS) as
raw material and bacillus (W) as auxiliary template. And then TiO 2 supported photocatalytic oxidation
desulfurization catalyst TiO 2-SBA-15-W was obtained. The samples were characterized by XRD, N 2
adsorption-desorption, SEM, EDS, FTIR, XPS, UV-Vis and PL. The results showed that the addition of
bacillus made the mesoporous order degree and pore diameter of TiO 2-SBA-15 increase, the ability of the
catalyst to absorb ultraviolet light enhance and the photoelectron-hole compound rate decrease.
Dibenzothiophene (DBT) was used as a probe to evaluate the catalytic performance of the catalyst. The
results indicated that the photocatalyst TiO 2-SBA-15-W with 1% bacillus content (based on the mass of SiO 2,
the same below) had better catalytic performance. Under the optimum reaction condition of catalyst dosage
of 1% (based on the mass of the model fuel, the same below), n(O)∶n(S)=20∶1 in hydrogen peroxide/
model fuel, V(extractant)∶V(model fuel)=1∶1, the desulfurization rate of the model fuel reached 90.6%
under irradiation for 120 min, which was 11.8% higher than that of TiO 2-SBA-15. The mechanism of
收稿日期:2020-05-10; 定用日期:2020-07-15; DOI: 10.13550/j.jxhg.20200387
基金项目:辽宁省高等学校杰出青年学者成长计划项目(LJQ2015062);辽宁省科学技术厅项目(20170540585);辽宁省教育厅项目
(L2015296、L2016018)
作者简介:杨丽娜(1976—),女,博士,教授,E-mail:yanglnzg@163.com。联系人:李剑(1974—),男,博士,教授,E-mail:
jlqdsd@163.com。