THIOL-OXIDATION WITH ZEOLITE ENCAPSULATED PHTHALOCYANINES - INFLUENCEOF THE SOLID SUPPORT

The catalytic activity of zeolite encapsulated cobalt-phthalocyanine f or thiol autoxidation varies with the composition of the zeolite suppo rt. Different zeolites were compared with carbon supports, The Si/Al r atio in the zeolite appears to be the key factor: it determines the hy drophobicity of the support, and it influences the loading of active c omplex in the zeolite. Two different types of reaction were tested: in an aqueous alkaline medium, the activity increases with hydrophobicit y of the support (thus giving carbon a substantial advantage), while i n an organic medium, were the commonly used systems are less efficient , sodium Y zeolite is more active than the usual carbon support.