Abstract
AbstractPt‐B/Al2O3 catalysts were prepared through chemical reduction of platinum ions with borohydride in a water/oil (W/O) microemulsion system comprising cetyltrimethyl ammonium bromide (CTAB), n‐butanol, cyclohexane, and H2PtCl6 solution. Transmission electron microscope (TEM) and selected‐area electron diffraction (SAED) analyses show that the active Pt particles on the catalysts are uniformly distributed as a Pt‐B amorphous alloy. We studied the effects of microemulsion composition, reduction conditions, and preparation methods on the catalysts applied into m‐chloronitrobenzene (m‐CNB) hydrogenation. We also investigated the kinetics of m‐CNB hydrogenation. The catalyst prepared via a single‐microemulsion method exhibited much higher activity and even higher selectivity than that prepared with the aqueous solution method. Finally, we propose the mechanism for Pt‐B effects on the catalytic performance of Pt‐B/Al2O3 in m‐CNB hydrogenation.
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