(548e) Syngas Production over Ni/MgAl2O4/Al2O3 Catalyst in Combined Reforming of Methane

Authors: 
Kim, N. Y., Korea Institute of Science & Technology
Moon, D. J., Korea Institute of Science and Technology
Lee, K. Y., Korea University
Yang, E. H., Korea Institute of Science and Technology
Noh, Y. S., Korea Institute of Science & Technology

Steam carbon dioxide reforming (SCR) of methane is an attractive process for getting a H2/CO ratio of 2 which is desirable for GTL (gas to liquid) and methanol (MeOH) synthesis processes. It is widely reported that Ni and noble metals are used as reforming catalysts due to good activity and stability in reforming process. Generally Ni is mainly applied for catalysts in reforming process because of relatively low cost and inherent availability. However it has some drawbacks like sintering and deactivation by coke deposition on the catalyst surface.  It was also reported that the Ni based catalysts Supported MgAl2O4 spinel compound layer existed between Ni and Al2O3 show good stability for the process. In this work, for improvement of catalyst stability, out-layered MgAl2O4 spinel for Ni/MgAl2O4/Al2O3 catalyst was investigated in SCR of methane. Supports with MgAl2O4 contents with different ratio on γ-Al2O3 were prepared by impregnation method.  The catalyst without out-layered MgAl2O4 was also prepared for comparison of catalytic activity. Prepared catalysts were characterized by various techniques such as N2 physisorption, H2-TPR, XRD, CO2-TPD, SEM, TEM-EDS and TG analysis.  Aspen simulation package was used to estimate optimum experimental conditions for SCR of methane. The simulation results were compared with the experimental results. It was found that the catalyst with the out-layer of MgAl2O4 showed better catalytic activity and stability. It was considered that due to the out-layer magnesium aluminate spinel formation between Ni and Al2O3 suppress carbon deposition and inactive NiAl2O4 or NiO-MgO formation.