Abstract

Abstract The cation exchange capacity (CEC) of sepiolite is greatly enlarged by the ion exchange in an aqeous solution at a high temperature of 95°C as well as the precalcination of original sepiolite at temperatures over 500°C. The Niions incorporated for Mgions in sepiolite crystal exist in the divalent state and are octahedrally-coordinated. An original sepiolite without Ni is completely inert as a catalyst for the dehydration reaction of n-butyl alcohol. However, the fixation of Ni confers much higher catalytic activity on it.

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