LaNi5触媒の酸化調製過程における結晶成長の測定

概要

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In the previous paper, it was made clear that high-temperature oxidation of LaNi<SUB>5</SUB> could produce catalysts with large surface area. However, the increase in surface area was accompanied by an increase in crystallite size, which suffered a lowering of dispersion.<BR>In this study, the rates of Ni and NiO crystallite growth during thermal treatment were measured and the relation between increase in surface area and crystallite growth was examined.<BR>It was found that neither crystallite size of unoxidized Ni nor NiO was changed in preparation of the catalysts, and the increase in surface area was caused by stress due to volume expansion from Ni to NiO.
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