【摘要】 使用不同改性液H₂SO₄-H₂O₂、（NH₄）₂CO₃-H₂O₂、（NH₄）HF₂-H₂O₂和（NH₄）₂CO₃+（NH₄）HF₂-H₂O₂混合溶液对中空钛硅分子筛进行改性。采用XRD、UV-Vis和拉曼光谱进行表征分析,考察改性前后钛硅分子筛在环己烷氧化反应的催化性能。结果表明,改性过程没有破坏钛硅分子筛的MFI拓扑结构,但提高了钛硅分子筛相对结晶度,并脱除了部分锐钛矿相TiO₂;与未改性钛硅分子筛相比,环己醇和环己酮选择性及H₂O₂有效利用率明显提高,以改性液（NH₄）₂CO₃+（NH₄）HF₂-H₂O₂改性钛硅分子筛效果最佳,醇酮选择性提高12.78个百分点,H₂O₂有效利用率提高17.33个百分点;（NH₄）₂CO₃+（NH₄）HF₂-H₂O₂混合溶液改性钛硅分子筛显著降低H₂O₂用量,在己内酰胺生产过程中有很好的应用前景。更多还原

【Abstract】 Hollow titanium silicalite（ HTS） was modified by different solutions of H₂SO₄-H₂O₂,（ NH₄）₂CO₃-H₂O₂,（ NH₄） HF₂-H₂O₂and（ NH₄）₂CO₃+（ NH₄） HF₂-H₂O₂. The modified HTS samples were characterized by XRD,UV-Vis and Raman. The catalytic performance of HTS before and after modification for cyclohexane selective oxidation were investigated. The results showed that the modification of HTS did notdestroy its topological structure of MFI,improved the relative crystallinity of HTS,and partial anatase Ti O₂ was removed. Compared with the HTS,the selectivity to cyclohexanol and cyclohexanone,and the utilization rate of H₂O₂ over modified HTS were improved obviously. HTS modified by the solution of（ NH₄）₂CO₃+（ NH₄） HF₂- H₂O₂ for cyclohexane selective oxidation exhibited optimal catalytic performance,and the selectivity to cyclohexanol and cyclohexanone was increased by 12. 78 percentage point,the utilization rate of H₂O₂ was improved by 17. 33 percentage point; HTS modified by the solution of（ NH₄）₂CO₃+（ NH4） HF₂-H₂O₂ remarkably decreased H₂O₂ dosage,which had good application prospect in the process of caprolactam production.更多还原