(425e) Highly Efficient Pt-Femo/Ni-Based Al2O3-CeO2 Catalysts for Dry-Reforming of Methane
Carbon dioxide is one of the highest contributors to the greenhouse effect, as well as a cheap and nontoxic building block for single carbon source chemistry. As such, CO2 conversion is one of most important research areas in energy and environment sciences, as well as in catalysis technology. For chemical conversion of CO2, natural gas (mainly CH4) is a promising counterpart molecule to the CO2-related reaction, due to its high availability and low price. More importantly, being able to convert CH4 to useful fuels and molecules is advantageous, because it is also a kind of âgreenhouse effectâ gas and can be an energy alternative to petroleum oil. In this Account, we discuss our development of efficient catalysts with precisely designed nanostructure for CO2 reforming of CH4 to produce syngas (mixture of CO and H2), which can then be converted to many chemicals and energy products such as GTL (gas-to-liquid) industry. In this point of view, we discuss the activity and stability of Al2O3-CeO2 supported monometallic Ni, bimetallic (NiMo), trimetallic (Ni-Mo-Pt), (Ni-Mo-Fe), and (Ni-Mo-Fe-Pt) catalysts have been investigated towards the carbon dioxide reforming of methane. The catalysts were prepared by incipient wetness impregnation with different contents of Ni, Fe, Mo and Pt and they were characterized by BET, XRD, H2-TPR, CO2-TPD, and FTIR-Pyridine methods. The reforming of methane with carbon dioxide has been investigated on Ni-based catalyst supported on Al2O3-CeO2 in a fixed-bed continuous-flow reactor. The catalytic reaction was conducted at various reaction temepratures (550-700 °C), space velocity of 12,000 ml h-1 and different feedstocks (pure CH4 or 50% CH4/CO2 mixture) under atmospheric pressure for 10 h time-on-stream. The co-doped Ni/Al2O3-CeO2 catalysts with Mo and Fe significantly enhanced the catalyst performance (more than 80% methane and 86% CO2 conversion). Further, our results indicated that the addition of 0.005 wt% Pt to the (FeMo/Ni/Al2O3-CeO3) composite catalyst leads to an excellent catalytic performance at 700 Â°C during the dry reforming reaction. (PtFeMo/Ni/Al2O3-CeO3) demonstrated very stable reactivity with very low carbon deposition.
Keywords; Dry reforming of methane; (PtFeMoNi/Al2O3-CeO3) composite catalyst.
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