By G. Poncelet, P.A. Jacobs, P. Grange and B. Delmon (Eds.)
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Additional info for Preparation of Catalysts VScientific Bases for the Preparation of Heterogeneous Catalysts, Proceedings of the Fifth International Symposium
Distribution of manganese over a representative silica granule from experiment U 3 4 . The drawn lines have been calculated for different values for the Thiele modulus ( @ ) . 32 0 . 8 granules as cubes with a length of From an estimate of De (lo-' follows. 67*10-4 m. 12 l/s. Comparison of this value with those of the rate constants reported in Table 1 shows that the consecutive precipitation reaction ( 4 ) is much more rapid than the rate-determining urea hydrolysis. 30 Development of a semi-quantitative model.
7 M. Montes, Ch. K. Hodnett, F. Delannay, P. Grange and B. Delmon, Appl. Catal. 12 ( 1 9 8 4 ) 3 0 9 . 8 B. Delmon, Solid State Ionics 16 ( 1 9 8 5 ) 2 4 3 . M. W. Geus, in (B. ), Preparation of Catalysts 11, Elsevier, Amsterdam, 1 9 7 9 , p. 1 1 3 . C. Warner, J . Biological Chemistry USA 1 4 2 ( 1 9 4 2 ) 7 0 6 . R. M. M. Beenackers, Chemical Reactor Design and Operation, John Wiley, Chichester, 1 9 8 4 , p. 3 8 3 . H. Perry, Chemical Engineers’ Handbook, 4th Edition, McGraw-Hill, 1 9 6 3 , pp.
Mo/Si02, Cu/A1203 and Ag/A1203. INTRODUCTION Catalyst synthesis by means of deposition precipitation comprises application of the active component onto an existing support via a chemical reaction. This reaction gives rise to the formation of an insoluble compound which involves the active element. The insoluble compound can be formed by an increase of the pH of the solution (hydroxide precipitation), a valence change of the element in question and the like. g. a uniform distribution of the active component over the carrier surface even at high loadings.