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Only at 873 K was there any detectable reaction over the support and this was over an order of magnitude less than the reaction detected in the presence of the cata1y st . The catalyst was tested at 673 K, 773 K,and 873 K, a fresh sample was used at each temperature. The reaction was run in pure butane with a GHSV of 9677 h-'. The results are shown in Table 1. 5 % respectively. The effect of varying space velocity was also examined. The results are shown in Table 2. 4 DISCUSSION The effect of increasing the temperature of reaction is shown in Table 1 and, as might be expected, the activity of the catalyst is seen to increase with temperature but decrease with time.
Petersen, Chem. Eng. , 1972,27, 227. P. G. S. Hunter, Statisticsfor Experimenters, Wiley, New York, 1978. J. R. Rostrup-Nielsen, Catal. Today, 1997, 37, 225. S. M. Lu, Appl. Catal. , 1998, 16, 269. DEACTIVATION BEHAVIOUR OF ZnIZSM-5 WITH A FISCHER-TROPSCH DERIVED FEEDSTOCK Arno de Klerk Fischer-Tropsch Refinery Catalysis, Sasol Technology Research and Development, PO Box 1 , Sasolburg 1947, South Africa 1 INTRODUCTION ZSM-5 based catalysts are widely used commercially, either in their unpromoted acidic form, or as metal promoted catalysts.
Typically, propane consumption was rapid within the first hour and after reaching a minimum, propane composition in the exit gas gradually rose towards a steady-state value, as seen in Figure 2. Temporal product (Hz, CO, C 0 2 and CH4) distribution was, however, dependent on the feed composition and temperature. Stoichiometrically,propane steam reforming requires a steam- Deactivation kinetics of cobalt-nickel catalysts 19 to-carbon (S:C) of 1, therefore catalysts used with S:C<1 are referred to 'severely' coked specimens, while those obtained under conditions with S:C>l are considered 'lightly' coked.