铁系催化剂组分间的作用

在 2 5℃加氢汽油介质中 Fe Cl3- Al(i- Bu) 3- phen体系为胶体催化剂的基础上 ,用电导率结合UV- Vis光谱对铁系催化剂各组分之间的相互作用作进一步的分析 .实验结果表明 :催化剂组分以离子对的形式参与反应 ;Al(i- Bu) 3以缔合状态存在并解离成离子对 ,它与 Fe Cl3作用是形成胶粒的主要反应 ;Fe2 +位于催化剂胶粒表面 ,Phen与 Fe2 +络合有阻止 Fe2 +被还原成更低价态 (Fe+、Fe0 )的作用 ;适当过量的 Al(i- Bu) 3形成双电层 ,使催化剂胶粒稳定 ,同时将 Fe3+还原成 Fe2 +.

Interactions of the Components of Fe Catalyst

FeCl3-Al(i-Bu)3-phen is a colloidal particle catalyst.The electric conductivities of the systems were measured which are composed of 25℃ hydrogasoline and the single component of the catalyst or multiple components mixed in different proportions. The relationships were obtained between the electric conductivities and the condensations of the components. The interactions among the components were analysed. The analysis result shows that, Al(i-Bu)3 exists in associated state and is dissociated into ion pair. The reaction of FeCl3 and Al(i-Bu)3 produces colloidal particles. Fe2+ exists in the surface of the colloidal particles of the catalyst. The reaction of Fe2+ and phen generates a complex compound which prevents Al(i-Bu)3 from reducing Fe2+ into Fe+ and Fe°. Excessive Al(i-Bu)3 is dissociated into ion pair and formes an electric double layer which keeps the stability of the colloidal particles. Simultaneously, Al(i-Bu)3 reduces Fe3+ into Fe2+.