Fe-V-HMS催化剂的制备及其氧化脱硫性能研究

Preparation of Fe-V-HMS molecular sieves and study on their catalytic oxidative desulfurization performance

以十二胺(DDA)为模板剂,正硅酸乙酯为硅源,采用一步合成法合成了双金属负载型Fe-V-HMS介孔分子筛催化剂,并通过FT-IR、XRD等手段对其进行了表征分析。以叔丁基过氧化氢为氧化剂,对Fe-V-HMS催化氧化脱除以正庚烷为溶剂的模拟油中的二苯并噻吩进行了活性评价。采用单因素法考察了催化剂用量、反应温度、反应时间、氧化剂用量对氧化脱硫效果的影响。结果表明:FeV-HMS催化剂可有效催化氧化脱除模拟油中的二苯并噻吩,在反应温度60℃、反应时间30 min、氧化剂用量0.03 m L、催化剂用量0.03 g、模拟油5 m L的条件下,脱硫率达到97.41%。介孔分子筛催化剂具有良好的化学性质和热稳定性,在催化领域有着很好的应用前景。

Mesoporous molecular sieve Fe-V-HMS catalyst is prepared successfully using dodecylamine and TEOS as templating agent and silica source with one-step synthesis method respectively. The samples are characterized by FT-IR and XRD. Using tert-butyl h-ydrperoxido （TBHP） as oxidant, the prepared, Fe-V-HMS catalyst is adopted to remove the dibenzothiophene （DBT） from the simulated oil with n-heptane as solvent by catalytic oxidation, and the activity of the catalyst is evaluated. The effects of catalyst dosage, re- action temperature, reaction time and oxidant dosage on the removing rate of sulfides of catalyst are investigated by single factor test. The results show that the Fe-V-HMS catalyst can efficiently remove dibenzothiophene from the simulated oil, and the removing rate of sulfides can reach 97.41% under the conditions of 0.03 g catalyst dosage, reaction temperature 60℃, reaction time 30min, oxidant amount 0.03 mL and model oil 5 mL. The mesoporous molecular sieve has better chemical property and thermostability, which shows great application prospect in the catalytic field.