The Study of the Effects of Promoters on the Catalytic Performance of the Nickel-Based Catalyst in Methane Thermocatalytic Decomposition

Document Type : Research Article

Authors

Catalyst and Advanced Materials Research Laboratory, Chemical Engineering Department, University of Kashan, Kashan, Post Code: 87317-51167, I.R. IRAN

Abstract

In the present work, 50%Ni and promoted 50%Ni-10%M (M=Ce, Mn, Mo, Pd) catalysts supported on nanocrystalline gamma alumina were prepared by sol-gel method and employed in the thermocatalytic decomposition of methane for production of COx-free hydrogen and carbon nanofibers. The catalysts were prepared by the wet impregnation method and characterized by XRD, BET, SEM, TPO and TPR techniques. The results revealed that the prepared samples exhibited mesoporous structure with high surface area. The γ-alumina support possessed a high surface area of 188.2 m2/g. In addition, the promoted catalysts showed the BET surface area in the range of 89.0 to 45.8 m2/g depending on the type of promoter. Moreover, TPR profiles revealed that the addition of palladium improved the catalyst reducibility. The thermocatalytic decomposition of methane was performed at different temperatures in order to investigate the effects of promoters and reaction temperature on the catalytic performance. The obtained results demonstrated that the addition of palladium compared to the other promoters improved the catalytic activity, especially at high temperatures. In the other hands, the results of stability test showed that the addition of palladium to the nickel-based catalysts significantly improved the catalyst lifetime. Also, the SEM analysis confirmed the formation of carbon nanofibers
on the spent catalysts.

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References

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