文章摘要
杨丽娜,周婷婷,齐玉欢,郭永成,李剑.芽孢杆菌辅助合成TiO2-SBA-15-W光催化氧化脱硫催化剂[J].精细化工,2020,37(11):
芽孢杆菌辅助合成TiO2-SBA-15-W光催化氧化脱硫催化剂
TiO2-SBA-15-W photocatalytic oxidation desulfurization catalystssynthesised with bacillus as auxiliary
投稿时间:2020-05-10  修订日期:2020-07-14
DOI:
中文关键词: 芽孢杆菌  TiO2  SBA-15  光催化  氧化  脱硫  催化技术
英文关键词: Bacillus  TiO2,SBA-15  photocatalysis  oxidation  desulfurization  catalysis technology
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)
作者单位E-mail
杨丽娜 辽宁石油化工大学 yanglnzg@163.com 
周婷婷 辽宁石油化工大学  
齐玉欢 北京市朝阳区中科合成油工程有限公司  
郭永成 中国石油抚顺石化分公司洗化厂  
李剑 辽宁石油化工大学 jlqdsd@163.com 
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中文摘要:
      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TiO2后得到TiO2-SBA-15-W光催化氧化脱硫催化剂。采用XRD、N2吸附-脱附、SEM、EDS、FTIR、XPS、UV-Vis及PL进行结构表征。结果表明,芽孢杆菌的加入使TiO2-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SiO2质量为基准,下同)的TiO2-SBA-15-W光催化剂性能较好,优化后反应条件为:催化剂用量为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。在此条件下,光照120min后,对模拟油的脱硫率达90.6%,比TiO2-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(?O2-)和空穴(h+)是PODS的主要活性物种。
英文摘要:
      Mesoporous molecular sieve SBA-15-W was synthesized using ethyl orthosilicate (TEOS) as raw material and bacillus (W) as auxiliary template. And then TiO2 supported photocatalytic oxidation desulfurization catalyst TiO2-SBA-15-W was obtained. The samples were characterized by XRD, N2 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 TiO2-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 TiO2-SBA-15-W with 1% bacillus content (based on the mass of SiO2, 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 TiO2-SBA-15. The mechanism of photocatalytic oxidative desulfurization (PODS) was proposed. Superoxide radicals (?O2-) and holes (h+) were considered to be the main active species of PODS.
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