Abstract:

Support for Ni-Pt-B amorphous alloy catalysts was prepared from pseudoboehmite and mordenite. The supported catalysts were then prepared by impregnation-chemical reduction and characterized by XRD，BET and H₂-TPR. Effects of preparation conditions，such as Pt content，alkali concentration of the reduction solvent and impregnation order，on the catalytic performance were studied with benzene hydrogenation to cyclohexane as a probe reaction. Results showed that the addition of trace Pt from chloroplatinic acid can promote the reduction of NiO and improve the catalytic activity. The best catalytic performance was found when the catalyst was made from Ni and Pt co-impregnation and dried before reduction with distilled water as the reduction solvent. At 0.5 MPa of pressure with hydrogen to benzene molar ratio of 4，cyclohexane yeild was achieved to 100% at temperature above 120 ℃ under MHSV of 1.0 h^－1.

摘要：

以拟薄水铝石、丝光沸石为原料制备载体，采用浸渍-化学还原法制备了负载型Ni-Pt-B非晶态合金催化剂，并对催化剂进行XRD、BET和H₂-TPR表征。以苯加氢制环己烷反应为探针，考察Pt、还原物溶剂碱浓度、浸渍顺序等因素对催化剂加氢活性的影响。结果表明，以H₂PtCl₆·6H₂O为原料添加的微量Pt能促进NiO的还原，并显著提高催化剂苯加氢活性；还原物溶剂为蒸馏水，采用Ni、Pt共浸渍并干燥后还原的方法制备的催化剂活性最好。在反应压力0.5 MPa、氢苯摩尔比4∶1，质量空速1.0 h^－1的条件下，反应温度高于120 ℃时，环己烷产率达到100%。