The objective of this project is to develop a numerical model for thermocatalytic methane decomposition in a plasma heated reactor.  The proposed work will be carried out in collaboration with the Princeton Collaborative Research Facility (PCRF) at the Princeton Plasma Physics Laboratory (PPPL). The decomposition process is an attractive method for hydrogen production with the potential to produce carbon nanotubes. However, this way of producing hydrogen has not been commercialized due to various problems (such as catalyst deactivation and reactor clogging). The proposed model will attempt to find solutions to these problems. The model should be able to predict not only hydrogen production as the main product, but also the formation and growth of carbon particles. The proposed multi-physics numerical model is a cost-effective method to achieve this goal, accounting for the flow in the fluid bed, plasma heating effects, the effects of the catalyst and its surface, etc. The model will be validated against experimental data for carbon production, the blockage of surfaces, etc. The proposed model should provide an inexpensive way to investigate different solutions for the technology while investigating the performance of the plasma heated reactor for hydrogen production.