茂钛配合物／纳米氢化钠高活性加氢催化剂活性物种相态  

Phase State of Active Species of Highly Active Bi-component Hydrogenation Catalyst Composed of

作　　者：范荫恒[1] 武美霞[1] 侯瑞[1] 廖世健[2] 

机构地区：[1]辽宁师范大学化学化工学院功能材料化学研究所,大连116029 [2]中国科学院大连化学物理研究所,大连

出　　处：《应用化学》2009年第3期349-351,共3页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(50071025)资助项目

摘　　要：茂钛配合物/nano-NaH双组分催化剂具有极高的加氢催化活性。将催化剂分离成上层清液和下层nano-NaH固体来研究高活性催化物种。取上层清液作为催化剂加到另一装有甲苯、1-辛烯并充氢气的反应瓶中,观察不到发生加氢反应的迹象;取下层nano-NaH固体,相同条件下立即发生加氢反应,催化剂效率(TO)达到2 800。进一步通过紫外光谱实验发现,上层清液中检测到茂钛物种的特征吸收峰的吸光度很小,仅为0.35,相同条件下,下层nano-NaH固体中检测到的茂钛物种吸光度很强为2.3,说明绝大部分的Cp2TiC l2被吸附在nano-NaH固体表面并形成了原位负载的催化活性物种。表明nano-NaH既是还原剂又是Ti活性物种的载体。由于负载使其不易失活,这就是其稳定性较好的一个主要因素。This paper describes the phase state of active species of bi-component catalyst composed of titanocene complex and nano-NaH for the hydrogenation of olefins. When the reaction mixture was separated into soluble and insoluble parts, it was found that the soluble part was not catalytic ally active, while the insoluble part was active, and the catalytical efficiency （turnover,TO） was up to 2 800 for the hydrogenation of olefins. A further study by UV technique showed that the absorbency of titanocene characteristic peak （2.3） for the insoluble part was much stronger than that for the soluble part. It is evident that most of the Ti species was adsorbed in situ on the surface of nano-NaH, and only a small part of them existed in solution. Nano-NaH act both as a reducing agent and a catalyst carrier for the Ti species. The supported catalytic active species of Ti showed a much better activity and stability than their homogeneous counterpart.

关 键 词：纳米氢化钠 茂钛配合物 均相催化物种 原位负载 

分 类 号：O614.1[理学—无机化学]