Two-Step Production of Syn gas and Hydrogen from Methane Using Ferrite-Based Metal Oxide Mediums

  • Young Ho Kim, Department of Fine Chemical Engineering and Chemistry, Chungnam National University, Korea
  • Kwang Seo Cha, Department of Fine Chemical Engineering and Chemistry, Chungnam National University, Korea
  • Hong Soon Kim, Department of Fine Chemical Engineering and Chemistry, Chungnam National University, Korea
  • Young Seak Lee, Department of Fine Chemical Engineering and Chemistry, Chungnam National University, Korea
  • Kyung Soo Kang, Korea Institute of Energy Research, Korea
  • Chu Sik Park, Korea Institute of Energy Research, Korea
  • Two step thermochemical methane reforming, proposed as one method for thermochemical conversion of high temperature heat from concentrated solar radiation into chemical energy, consists of a syn gas production step and hydrogen production step. In the first step, the metal oxide(MOox) was reduced with methane to produce CO, H2 and the reduced metal oxide(MOred). In the second step, the reduced metal oxide was reoxidized with steam to produce H2 and the metal oxide. As the grate advantages of this technology using solar energy, the produced syn gas is ideally upgraded by 28% in a calorific value and the production of pure hydrogen in the separated step is theoretically possible. The key of the technology is to develop metal oxide mediums with high oxygen capacity and stability for the redox reaction. In this study, we first prepared the various mediums composed of the mixture of M (M=Co, Cu, Mn, or Ni)-substituted ferrite as an active component and ZrO2 as a binder, and investigated the effects of a transition metal component and an addition of ZrO2 on the redox characteristics. Based on the TPR/TPO and the redox experiments using a fixed bed infrared reactor, the Mn-ferrite/ZrO2 with high reaction rate and the Cu-ferrite/ZrO2 with relatively high stability were selected for 10 times cyclic tests of the mediums in the redox reaction. The results of cyclic tests were discussed in connection with the physical and chemical properties of the mediums.