CATL 25 |
| Yue-ping Zhang, Department of Chemistry, Tianjin University, 92 Weijin Road, Tianjin, 300072, China, Kai-lu Yu, State Key Laboratory of C1 Chemistry and Technology, Tianjin University, 92 Weijin Road, Tianjin, 300072, and Yuan-bin She, Department of Applied Chemistry, Beijing Polytechnic University, 100 Ping Le Yuan, Chaoyang District, Beijing, 100022, China. |
| Desulfurization of liquid fuels is very important for the emission control. If the sulfur compounds can be totally removed, the post SOx reduction will become not necessary. The present work demonstrates that metal-zeolite catalysts have a very high activity for hydrodesulfurization. The present work also confirms that the plasma preparation of catalyst can produce an excellent catalyst for hydrodesulfurization. The plasma-prepared Pd/HZSM-5 catalyst exhibits an excellent low temperature activity. At 100 °C, the thiophene conversion over the plasma-prepared Pd/HZSM-5 catalyst can be as high as 76%, while it is only 49% over the conventional Pd/HZSM-5 catalyst. The IR analysis indicates a plasma-enhanced acidity (including Brönsted and Lewis acidities) that is very helpful for the conversion of thiophene. This plasma-enhanced acidity does not induce an increase in the carbon deposit that is very important for the potential application. The XPS characterization confirms that the plasma preparation of catalyst leads to a production of pure and highly dispersed Pd/HZSM-5 catalyst. This is also very important for hydrodesulfurization at low temperatures. The present investigation suggests that the plasma catalyst preparation technology is effective for the preparation of high active catalyst for hydrodesulfurization at low temperatures, which would lead to a significant improvement in the economics for catalytic hydrodesulfurization. |
|
Plasma Technology and Catalysis
1:30 PM-4:45 PM, Tuesday, March 25, 2003 Convention Center -- Room 342, Oral
Catalysis & Surface Science Secretariat |