论文部分内容阅读
用HP5988A型色谱-质谱仪的多离子选择检测器和310工程计算机系统考察了PtCl_(2-)(PPh_3)_2,Pt-3(CO)_3(PPh_3)_4和Pt_4(CO)_5(PPh_3)_4等化合物在γ-Al_2O_3,TiO_2和SiO_2载体上的程序升温热分解特性。结果表明:铂簇合物在TPDE-H_2下的脱羰基过程比TPDE-He下简单。在TPDE-H_2下,在373K能检测到单一的CO_2脱附峰,三苯基膦配体在不同载体上的分解和脱附时,苯是主要脱附产物(≥90mol％);在TPDE-He下,三苯基膦配体的分解和脱附特性同载体性质明显有关。若以脱附苯的mol％为指标,则TiO_2>γ-Al_2O_3>SiO_2。另外,在两种情况下,三苯基膦配体的分解和脱附,均因铂的存在而加速。在脱附产物中,均未发现任何含磷化合物,证明磷在铂簇合物分解后还残留在催化剂上。
The effects of PtCl_ (2 -) (PPh_3) _2, Pt_3 (CO) _3 (PPh_3) _4 and Pt_4 (CO) _5 (PPh_3) _3 on the HP5988A GC / MS detector and 310 computer system were investigated. _4 and other compounds in the γ-Al 2 O 3, TiO 2 and SiO 2 carrier temperature programmed thermal decomposition characteristics. The results show that the decarbonylation of Pt cluster with TPDE-H 2 is simpler than TPDE-He. Under TPDE-H 2, benzene was the main desorption product (≥90 mol%) at 373 K when a single CO 2 desorption peak was detected and the triphenylphosphine ligand was decomposed and desorbed on different supports. In TPDE- Under He, the decomposition and desorption characteristics of triphenylphosphine ligand are obviously related to the properties of the carrier. If the mol% desorption of benzene as an indicator, the TiO 2> γ-Al 2 O 3> SiO 2. In addition, in both cases, the decomposition and desorption of triphenylphosphine ligands are accelerated by the presence of platinum. No phosphorus-containing compounds were found in the desorption products, demonstrating that phosphorus remained on the catalyst after the platinum cluster was decomposed.