119 4 results and discussion catalytic partial

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Unformatted text preview: ol 50 25 0 600 yield [%] 60 700 800 900 1000 700 800 900 1000 700 800 900 1000 700 800 900 1000 CO H2 45 30 15 0 600 yield [%] 60 H2O CO2 CH4 45 30 15 0 600 yield [%] 40 C2H2 C2H4 C3H6 30 20 10 0 600 temperature [°C] Fig. 36 Catalytic partial oxidation of C3H8 of the homgeneous reaction (empty reactor) and over quartz woll, 25% O2 surplus 120 4. Results and discussion - catalytic partial oxidation of propane conversion [%] 100 O2 75 C3H8 Full symbols: Ni10C900 Hollow symbols: Ni0C900 50 25 0 600 650 700 750 800 700 750 800 700 750 800 750 800 yield [%] 40 CO 30 H2 20 10 0 600 yield [%] 30 650 H2O CO2 CH4 20 10 0 600 yield [%] 40 650 CH4 30 C2H4 C3H6 20 10 0 600 650 700 temperature [°C] Fig. 37 Catalytic partial oxidation of C3H8 over Ni0C900 and Ni10C900 (not reduced), 25% O2 surplus, GHSV 900dm3·h-1·g-1 121 4. Results and discussion - catalytic partial oxidation of propane 100 conversion [%] Full symbols: decreasing temperature Hollow symbols: increasing temperature 75 O2 C3H8 50 550 600 650 700 750 800 100 yield [%] 75 50 CO H2 25 550 600 650 700 750 800 30 yield [%] H2O CO2 CH4 20 10 0 550 600 650 700 750 800 temperature [°C] Fig. 38 Temperature cycle of the catalytic partial oxidation of C3H8 over Ni10C900, 25% O2 surplus, GHSV 900dm3·h-1·g-1, starting temperature 800°C 4. Results and discussion - catalytic partial oxidation of propane 122 All these results show that the partial oxidation of C3H8 can be very effectively catalysed by the reduced Ni containing catalyst. Only CO and H2 were the main products. The not reduced Ni containing catalyst was not effective as it was also reported in the literature for the partial oxidation of CH4. Since unreduced Ni/Mg/Al catalyst has no specific catalytic activity compared to the pure Mg/Al oxide catalyst it is clear that Ni2+ ions have no specific activity in the catalytic partial oxidation of C3H8. The decrease in the conversion at a slightly higher temperature region for the reactor containing the quartz wool bed compared with conversion in the empty reactor (700°C instead of 650°C) results from a slight pressure drop and/or the suppression of homo...
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This document was uploaded on 10/07/2013.

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