PREPARATION AND CHARACTERIZATION OF HYBRID CATALYSTS FOR CO2 HYDROGENATION REACTION
Hybrid catalytic system comprising different ratios of CuO/ZnO/Al2O3: zeolite have been formulated and characterized. The methanol-synthesis catalyst, Cu/ZnO/Al2O3 (CuO:ZnO:Al2O3 = 50:45:5), was prepared by a co-precipitation method. The copper catalyst was physically mixed with ZSM-5 zeolite at rat...
| Main Authors: | , , |
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| Format: | Citation Index Journal |
| Language: | English |
| Published: |
Malaysian Solid State Science and Technology Society
2007
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| Subjects: | |
| Online Access: | http://scholars.utp.edu.my/id/eprint/1008/ http://scholars.utp.edu.my/id/eprint/1008/1/J_Solid_state_Sci_vol_14_2007_Muhammad_Zahiruddin_Ramli_99-104.pdf |
| Summary: | Hybrid catalytic system comprising different ratios of CuO/ZnO/Al2O3: zeolite have been formulated and characterized. The methanol-synthesis catalyst, Cu/ZnO/Al2O3 (CuO:ZnO:Al2O3 = 50:45:5), was prepared by a co-precipitation method. The copper catalyst was physically mixed with ZSM-5 zeolite at ratios of 1:1, 1:2 and 2:1. The hybrid catalysts were characterized using x-ray diffraction method (XRD), temperature-programmed reduction (TPR) and temperature-programmed desorption (TPD) with ammonia. The hybrid catalysts produced two different acid sites as depicted by the ammonia TPD profiles. A TPD peak at 300°C indicated a weak acid site and a stronger acid site were observed at 550 °C. The hybrid catalyst with a 1:1 weight ratio has the highest acid strength and absorbed the most hydrogen. This hybrid catalyst may be used in the hydrogenation of CO2 to methanol and dimethyl ether. |
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