CO₂ methanation is a technology that produce CH₄ using CO₂ and H₂ as raw materials through the Sabatier reaction. In the present study, the effects of temperature characteristics and CO₂ conversions in the two types of catalyst reactors (i.e., granular catalyst reactor, catalyst coated reactor) were evaluated. For the catalyst coated reactor, the base substrate was formed to a circular tube composed of agglomerates of metal particles by the Additive Manufacturing method. The catalyst layer was produced by the slurry coating method. The fine particles in the slurry were obtained by pulverizing the commercially catalyst with a hammer mill. The thickness of the catalytic particle layer was increased by multiple coating process, and the catalyst base-substrate was not exposed. The temperature rise of nearly 50°C occurred in the granular catalyst reactor at a set temperature of 300°C, while in the coated catalyst reactor the temperature was almost flat along the gas flow direction. Furthermore, it was clarified that the CO₂ conversions were determined by the maximum temperatures of the catalyst reactors. The proposed reactor in this study showed the possibility for solving the problem in the methanation process that is the temperature rises during the reaction.

It is important to consider the equipment wear in bead mills to maintain quality and control operational costs. In the conventional wear simulation, mesh deformation is applied using wear laws. There is a problem that the mesh is broken when large mesh deformations occur. We propose the wear simulation model which represents shape deformation by the interface capturing method in this study. The proposed model is robust because the model deforms equipment shape without requiring mesh deformation. Moreover, proposed model reduces computational costs by coupling with IB-DEM (Impulse-Based Discrete Element Method) which allows for a larger time step size than conventional DEM. We demonstrate the wear results when significant shape deformations occur due to collision with beads. We verify the proposed model by comparing the numerical results with actual worn parts by applying to the dry bead mill.

The Sustainable Development Goals were adopted by the United Nations in 2015. Technologies that realize an economically low-carbon society are attracting attention of the international community. Regarding powder processing technology and device development, we will introduce examples of technological development that contribute to the achievement of the SDGs (Sustainable Development Goals).

The successful application of zeolites in diverse fields largely relies on their high stability, unique catalytic activity, and adsorptive properties. However, the property requirements for zeolites have become severe due to their diverse and demanding applications. Novel post-synthetic treatment of zeolites show that properties of zeolites can be tuned by simple liquid-mediated treatments, in which new concepts such as pore-filler stabilization and pore-opening migration have been proposed. For example, development of extremely stable zeolites that can withstand over 1000°C steaming and dealumination of small-pore zeolites, which had been believed to be impossible, were reported and further superior zeolite-based catalysts with longer catalytic life and/or improved selectivity have been realized.