松香大分子多相催化反应的孔效应研究(英文)

POROSITY EFFECT IN HETEROGENEOUS CATALYTIC REACTION OF ROSIN MACROMOLECULES

在大分子多相催化反应中 ,由于反应物分子较大 ,使反应分子不能进入固相催化剂的微孔中与活性组分接触 ,因而分布于载体微孔中的活性组分对于大分子的催化反应是无效的。本文报道了用“浸渍胶体”法制备出松香大分子改性用Pd/C催化剂 ,该催化剂活性组分较集中分布于活性炭表面及大孔周围。与传统浸渍法制备的Pd/C催化剂在松香歧化反应中比较 ,新方法制备的催化剂显示出更好的活性 ,克服了松香大分子因“孔效应”造成传统浸渍法制备的Pd/C催化剂中小孔周围的活性组分不能有效使用的缺点。

In this study, the porosity effect in heterogeneous catalytic reactions was exemplified by investigating disproportionation of natural rosin. Through colloidal impregnation of active metal composition, a high efficient catalyst used for catalytic reactions of rosin had been prepared, in which catalyst metal particles mainly located on the external surface and in the macro pores of charcoal supports. This catalyst got rid of most the “porosity effect” and exhibited improved catalytic activity.