| Autor: |
Xi, Yanyan, Xiao, Jianmei, Lin, Xufeng, Yan, Weining, Wang, Chuangye, Liu, Chenguang |
| Zdroj: |
Industrial & Engineering Chemistry Research; July 2018, Vol. 57 Issue: 31 p10137-10147, 11p |
| Abstrakt: |
A SiO2-modified Pt/Al2O3catalyst (SiO2/Pt/Al2O3) was synthesized with a solution-based method using Pt/Al2O3as the starting catalytic material and tetraethoxysilane (TEOS) as the Si precursor. The modification process can be conducted with several cycles. Each of the modification cycles included sequentially an evacuation step at an elevated temperature and an impregnation step followed by a solution-treatment step. The introduced SiO2layer showed an obvious sintering-resisting effect for the Pt nanoparticles at a high temperature of 600 °C. When used for catalytic oxidative dehydrogenation of ethane (ODHE), SiO2/Pt/Al2O3presented a significantly improved catalytic stability and coking depression compared to the unmodified Pt/Al2O3. Furthermore, the introduced SiO2layer helped improve the ethane conversion slightly and the selectivity to ethylene mildly. The improved selectivity to ethylene could be associable with the Brönsted acid sites brought by the SiO2layer as well as site distribution of the exposed Pt surface. |
| Databáze: |
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