Effect of surfactant modification on the desulfurization performance of Zn/Ti-PILCs adsorbent
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摘要: 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1nm～4nm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。Abstract: 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).
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Key words:
- surfactant /
- pillared clays /
- Ti-PILCs /
- desulfurization /
- adsorbent
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