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Dowden (Specialist Periodical Report), The Royal Society of Chemistry, London, 1980, Vol. 3 , p . 136. R. Burch, Platinum Met. , 1978, 22, 57. P. Biloen, J. N . Helle, H. Verbeek, F. M. Dautzenberg, and W. M. H. Sachtler, J. , 1980,63,112. R. Bouwman and P. Biloen, J . , 1977,48,209. F. M . Dautzenberg, J . N. Helle, P. Biloen, and W. M . H. Sachtler, J. , 1980, 63,119. A. C. Muller, P. A. Engelhard, and J . Weisang, J. Cat& 1979,56,65. R. Burch, J. , 1981,71,348;R. Burch and L. C. , 1981,71, 360.

3 MetalSupport Interactions with Insulator Oxides Interactions with Simple Insulator Oxides. , A1203, S i 0 2 , and MgO and to distinguish these from crystalline aluminosilicates which will be treated briefly in the next section. After due allowance is made for the support effects giving rise to apparent metal-support interactions as discussed above, it is possible t o state with some conviction that the direct influence of these insulator oxide supports upon the geometric or electronic properties of small metal particles is usually Like all generalizations, this statement needs to be qualified in a number of ways.

Hence it can be concluded that extra steps such as those listed above have to be incorporated in order t o obtain relaxation and other complex multiple peak oscillations described in the literature. From those models that have been investigated the most plausible would appear t o involve: 1 . Surface heterogeneity leading to rate constants being a function of surface c o ~ e r a g e . ~ *54-56 ’~’ 2. Formation of buffer species which block the sites and drive the system between low and high conversion ~ t a t e ~ .

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