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考察了氧化铝担载的铂金属原子簇化合物 Pt3 ( μ2 -CO) 3 ( PPh3 ) 4 和 [Pt3 ( CO) 6 ]5[N( C2 H5) 4 ]2 (分别标记为 Pt3 和 Pt15)催化正庚烷转化反应的性能 ,并与常规铂催化剂 (标记 Pt1)在相似条件下的催化行为进行比较。正庚烷转化反应在内循环无梯度反应器内进行 ,转速 1 1 0 0 r· min- 1,催化剂装量 3 m L ,反应产物的出口与气相色谱仪相连 ,由计算机控制进行全程分析。反应条件为 50 0℃ ,1 .2 MPa,V( H2 )∶V( n-C7) =1 0 0 0∶ 1 ,空速为 3 .0 h- 1,测定催化剂的性能。再将压力由 1 .2 MPa降至 0 .4MPa,V( H2 )∶ V( n-C7) =70 0∶ 1 ,空速为 3 .0 h- 1初步考察催化剂的稳定性。测定数据表明 ,Pt3 和 Pt15的反应活性、异构化选择性和稳定性均高于常规铂催化剂 Pt1,Pt3 的活性和异构化选择性优于 Pt15。所得结论对于工业过程具有实际意义
The catalytic activity of alumina-supported platinum metal cluster compounds Pt3 (PPh3) 4 and [Pt3 (CO) 6] 5 [N (C2H5) 4] 2 (Pt3 and Pt15 respectively) The performance of the n-heptane conversion reaction was compared with that of the conventional platinum catalyst (labeled Pt1) under similar conditions. The n-heptane conversion reaction was carried out in an internal circulation gradientless reactor with a rotation speed of 110 r · min-1 and a catalyst loading of 3 m L. The outlet of the reaction product was connected to a gas chromatograph and controlled by a computer for full analysis. The reaction conditions were as follows: 50 0 ℃, 1.2 MPa, V (H2): V (n-C7) = 100: 1 and space velocity of 3.0 h- 1. Then the pressure was reduced from 1.2 MPa to 0.4 MPa, V (H2): V (n-C7) = 70 0: 1, and the space velocity was 3.0 h-1. The measured data show that Pt3 and Pt15 reactivity, isomerization selectivity and stability are higher than the conventional platinum catalyst Pt1, Pt3 activity and isomerization selectivity than Pt15. The conclusion is of practical significance for industrial processes