Catalytic performance of Ti-SBA-15 prepared by chemical vapor deposition for propylene epoxidation

Ti-SBA-15C catalysts were prepared by supporting Ti on SBA-15 with chemical vapor deposition (CVD) using TiCl4 as titanium source, and were characterized by XRD, N2 adsorption, FT-IR and ICP. The results show that SBA-15E prepared by ethanol solution extracting template has higher concentration of surface Si–OH groups than SBA-15 calcined at 550 °C, resulting in high Ti content on Ti-SBA-15EC prepared by CVD. The temperature and time of TiCl4 deposition affect the Ti content and catalytic activity of Ti-SBA-15EC for the epoxidation of propylene with cumene hydroperoxide (CHP). Ti-SBA-15EC prepared by CVD at 700 °C for 1.5 h exhibits more excellent performance than Ti-SBA-15C, Ti-SBA-15 prepared hydrothermally and Ti/SBA-15 (impregnation method), and the 87.3% conversion of CHP and 96.4% selectivity to propylene oxide can be obtained at 80 °C for 4 h. The performance of Ti-SBA-15EC is decreased hardly for the epoxidation of propylene after used repeatedly 6 times.

Ti-SBA-15 catalysts were prepared on SBA-15 by CVD using TiCl4 as titanium source. Using SBA-15 prepared by the ethanol solution extracting template as the support, Ti-SBA-15 with high Ti content can be prepared. Ti-SBA-15 prepared by CVD at 700 °C for 1.5 h exhibits more excellent performance and stability for the epoxidation of propylene with CHP than that prepared by other methods.Figure optionsDownload as PowerPoint slideHighlights
► Ti-SBA-15 catalyst was prepared by supporting Ti on SBA-15 with CVD method.
► Template in as-prepared SBA-15 was removed by the ethanol solution extraction.
► Ti-SBA-15 catalyst has very excellent activity and stability for the epoxidation of C3H6.