Pt/TiO2催化剂微乳液法制备条件对邻氯硝基苯选择性加氢性能的影响

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。

EFFECT OF PREPARATION CONDITIONS BY MICROEMULSION METHOD ON THE ACTIVITY OF Pt/TiO2 CATALYST DURING SELECTIVE HYDROGENATION OF o-CHLORONITROBENZENE

Pt/TiO₂ catalyst was prepared by microemulsion system of CTAB/butarol/cyclohexane/H2PtCl6 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/TiO2 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 TiO2 was helpful to enhance the catalytic activity of Pt/TiO2 catalyst.