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Because, for the hydrogenation of light fraction oil, 3¡«8 nm of aperture was profitable, while for heavy oil hydrogenation, 7¡«13 nm was the best pore diameter range. The aperture of catalyst which was too small might hinder the diffusion of reactants and products, and that too large was not good for the dispersion of active phases.
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Noted that too small aperture of catalyst might hinder the diffusion of reactants/products and (that) too large leveled the difficulty of well dispersion of active phases, 3¡«8 nm of aperture was appropriate for hydrogenation of light fraction oil, while 7¡«13 nm favored heavy oil.
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