By S.D. Jackson, J.S.J. Hargreaves, D. Lennon

Catalysis in software offers a image of the main up to date advancements within the box of utilized catalysis. assurance is especially within the parts of hydrogenation, dehydrogenation, chiral catalysis, environmental catalysis and catalyst deactivation, combining a different mixture of chemistry and chemical engineering.With its wide-ranging assurance, this publication might be a welcome boost to the cabinets of each practitioner in catalysis, either in and academia.

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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.

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