表面活性剂改性对Zn/Ti-PILCs吸附剂脱硫性能的影响

Effect of surfactant modification on the desulfurization performance of Zn/Ti-PILCs adsorbent

在柱撑黏土Ti-PILCs的合成过程中,加入各种表面活性剂进行改性,通过负载Zn制备了Zn/Ti-PILCs吸附剂,考察了其对模拟柴油中二苯并噻吩的选择吸附性能。结果表明,经表面活性剂尤其是十六烷基三甲基溴化铵(CTAB)改性制备的Zn/Ti-PILCs其吸附脱硫率得以显著提高。当CTAB/Ti摩尔比为0.5时,Zn/Ti-PILCs-CATB具有最佳的吸附性能,DBT去除率达96.3%。N2吸附脱附等温线和孔径分布研究表明,CTAB改性可增加1 nm～4 nm孔的数量,并改善黏土层间柱子的分布,使Ti-PILCs具有更高的比表面及更均匀的孔径分布。

Various surfactants were added during the synthesis of pillared clays Ti-PILCs to modify their structure and properties.Zn supported on the surfactant-modified Ti-PILCs（Zn/Ti-PILCs） was used as a desulfurization adsorbent and its performance in desulfurization of a model diesel oil containing dibenzothiophene（DBT） was investigated.The results showed that the capability of Zn/Ti-PILCs for DBT selective adsorption is enhanced by the surfactant modification.Especially,Zn/Ti-PILCs-CTAB obtained through modification with hexadecyl-trimethyl-ammonium bromide（CTAB）（CTAB/Ti molar ratio being 0.5） exhibits high desulfurization performance with a DBT removal rate of 96.3%.The characterization results of nitrogen sorption indicated that the surfactants added during the pillaring process can increase the surface area of the resultant Ti-PILCs and improve their pore distribution by enhancing the amounts of mesopores（1nm～4nm）.