Pt/TiO2 catalyst was prepared by microemulsion system of CTAB/butarol/cyclohexane/ HzPtCl6 usinghydrazine as reductant and TiO2 as support. The effect of microemulsion compositions and the crystalline state of TiO2 on the activities of Pt/TiO2 catalysts for selective hydrogenation was studied using o-chloronitrobenzene (o-CNB) selective hydrogenation as a probe reaction. The results showed that Pt/TiOz catalyst having the highest activity in selective hydrogenation of o-CNB was prepared from a microemulsion system with mCTAB:mbutanol=3:7, (mCTAB+mbutanol):mcyclohexane=3 : 7 and the amount of H2PtCl6 solution occupied 3. 6% of the total system mass. Furthermore, the study of crystalline states revealed that anatase type TiO2was helpful to enhance the catalytic activity of Pt/TiO2 catalyst.%采用十六烷基三甲基溴化铵/正丁醇/环己烷/H2PtCl6溶液的微乳体系,以N2H4·H2O为还原剂、TiO2为载体制备Pt/TiO2催化剂.以邻氯硝基苯选择性加氢反应为探针反应,考察微乳液组成及TiO2晶型对催化剂选择性加氢活性的影响.结果表明:当微乳体系中mCTAB∶m正丁醇＝3∶7、(mCTAB+ m正丁醇)∶m环己烷＝3∶7、H2PtCl6溶液用量占体系质量的3.6％时,制备的Pt/TiO2催化剂的邻氯硝基苯选择性加氢活性最高；锐钛矿型TiO2有助于提高催化剂的活性.
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