| 초록 |
Abstract : One step synthesis of MIBK from acetone over Ni/CaO catalyst was studied. 10 wt% Ni/CaO catalysts were prepared by conventional impregnation method (catalyst I), and liquid phase oxidation method using certain oxidants (catalyst L). Catalyst L showed much higher overall conversion, MIBK selectivity, and BET surface area than catalyst I. The pore mouths of CaO were blocked by Ni(OH)2 due to the ready precipitation of nickel nitrate to Ni(OH)2 in basic CaO suspension. But CaO pore structure was easily recovered by oxidizing Ni(OH)2 to NiOOH. MIBK selectivity could be increased up to 70 mol% giving a fairly high conversion with increasing the feed rate of acetone to 56 cc.h-1.gcat-1 because the formation of DIBK (diisobutyl ketone) was not favored relatively than that of MIBK in an acetone-rich condition due to both lack of (-hydrogen and steric hindrance of MSO(mesityl oxide). MSO as an intermediate was directly formed without the formation of DAA.
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