The product stream was analysed by the analytical

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Unformatted text preview: actor, the electric furnace and the temperature control was similar to the one described in the temperature programmed reaction experiments. The product stream was analysed by the analytical unit consisting of a gas chromatograph with flame ionisation detector (GC-FID) (Shimadzu, Japan, model GC-14A) equipped with a Porapack Q column, 5· 1/8’ in stainless steel 61 2. Experimental ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff (Macherey-Nagel). Samples were taken automatically using a GC controlled 6 port equipped with a sample loop. The catalysts (50 mg) were activated prior to the reaction by heating in a flow of air up to 600°C/30min and cooled down to the starting reaction temperature in a flow of He. The reactions were from 200 to 280°C for isopropanol, step size 10°C, and from 270 to 310°C for acetone, step size 20°C. For each experiment a fresh catalyst sample was used. 2.8. Catalytic partial oxidation of propane 2.8.1. Catalytic reactor set up The set up used for the catalytic tests, depicted in Figure 7, consisted of three general parts: the reactant feed system, the reactor and the analytical unit. O2 Thermo element Temperature controller Toggle Mass flow valves controllers Quartz capillary 4 port valve He C3H8 Electrically heated furnace H2 Condensator GC-TCD with automatic sample valve Water-ice mixture Vent Catalyst (5mg) on quartz wool bed Quartz capillary Fig. 7 Schematic drawing of the apparatus set up used in the catalytic tests (left) and of the packed micro flow reactor (left) 2. Experimental 62 The gas flows were controlled by 3 mass flow controllers (Brooks, USA), one used for reductive gases: propane (Aldrich, 98%+) or H2 (generated by a gas generator (Domnik Hunter, England, model DHG 500), one used for O2 (technical grade, Poligaz) and the last one for the inert gas (He, 99,999%+, Praxair, Poligaz). Helium was further purified by a heated high capacity gas purifi...
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