Abstract
Zeolite bulk bodies containing macropores, mesopores, and micropores were prepared and characterized using ZSM-5 raw powder as the starting material. Starch powder was selected as a pore-forming agent and the internal porous structure was controlled by using the property that starch particles form a network structure by heat treatment. The presence of mesopores was characterized by N2 gas adsorption/desorption measurement, and the macroporous structure was observed by the 3D-image analysis of hundreds of cross-sectional images in the depth direction by a confocal laser fluorescent microscope using the liquid immersion method. The observation method demonstrated that it is possible to observe structures of several microns size in the three dimensions. The compressive strength and N2 gas permeability of the bulk samples depended on the sample structure; bulk bodies with a compressive strength comparable to that of general concrete were created. The network structure of the starch pore-forming agent was effective in creating a continuous macroporous structure. The bulks could be used in applications such as novel catalyst carriers and filters, and combining functional nanoparticles.
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