The kinetics of the copolymerization of ethylene with carbon monoxide catalyzed by (dppp)Pd(TsO)(2) (I) has been investigated under homogeneous conditions and in slurry with supported catalyst I/P (P: polymer support polyketone (PK)), at different catalyst concentrations. The specific rate reduced to gram of Pd of the initial stage of reaction is going up with increasing catalyst concentration, and the specific rate of the second macro-kinetic stage decreases with increasing catalyst loading. The productivity of supported catalysts I/P and I/SiO2 has been analyzed in terms of the PK yield per gram of supported catalyst per hour. The specific copolymer yield increases with the increase in catalyst loading in I/P to 2 x 10(-4) mol of Pd per 1 g of the supported catalyst and attains the maximum value of 27 g(PK)/(g(supcat.)h) when copolymerization is carried out in the heptane-toluene mixture. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.