Except for the reference catalyst the tendency

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Unformatted text preview: higher at 700 than at 800°C. At 700°C it was lowest for the reference catalysts and then for Ni10C900. At 800°C it was lowest over Ni10C900. For the Mg containing catalysts it generally increased with increasing Ni/Mg ratio of the catalysts. The pure HT-derived Ni/Al, Ni72C900 exhibited lower tendency towards coking than Ni50C900. 111 4. Results and discussion - catalytic partial oxidation of propane conversion [%] O2 100 99 C3H8 98 100 98 100 99 99 93 88 90 87 87 83 80 80 74 70 Ni5C900 yield [%] CO 80 80 Ni10C900 Ni15C900 H2 Ni30C900 Ni50C900 Ref.-Cat. 85 76 76 75 68 64 Ni72C900 72 65 62 59 60 60 58 47 40 Ni5C900 H20 CO2 Ni15C900 Ni30C900 Ni50C900 Ni72C900 Ref.-Cat. 20 30 Ni10C900 20 27 CH4 yield [%] 24 20 17 16 11 10 44 65 55 44 8 7 2 0 Ni5C900 Ni10C900 Ni15C900 Ni30C900 Ni50C900 5 0 Ni72C900 catalyst Fig. 32 Catalytic screening at 700°C, 25% O2 surplus, GHSV 900dm3·h-1·g-1, TOS 240min 1 Ref.-Cat. 112 4. Results and discussion - catalytic partial oxidation of propane conversion [%] O2 100 C3H8 100 100 99 99 96 95 93 100 99 99 92 91 91 90 86 80 Ni5C900 CO Ni10C900 Ni15C900 Ni30C900 Ni50C900 Ni72C900 Ref.-Cat. H2 yield [%] 100 90 87 89 85 86 86 79 80 73 72 72 71 70 70 65 60 Ni5C900 H20 yield [%] 20 Ni10C900 CO2 Ni15C900 Ni30C900 Ni72C900 Ref.-Cat. CH4 18 16 Ni50C900 19 16 15 16 12 10 22 2 3 3 4 4 2 3 2 3 2 3 1 0 Ni5C900 Ni10C900 Ni15C900 Ni30C900 Ni50C900 Ni72C900 catalyst Fig. 33 Catalytic screening at 800°C, 25% O2 surplus, GHSV 900dm3·h-1·g-1, TOS 240min Ref.-Cat. 113 4. Results and discussion - catalytic partial oxidation of propane deactivation rate / h 120 700 23 30 800 17 84 -2.2 20 10 26 46 -2.1 11 7.2 0 -20 -57 -120 wt% coke / g(catalyst) 300 700 800 269 200 127 100 97 54 64 47 17 15 26 76 59 29 24 31 0 Ni5C900 Ni10C900 Ni15C900 Ni30C900 Ni50C900 Ni72C900 catalyst Fig. 34 Coking and catalyst deactivation at 700 and 800°C, 25% O2 surplus, GHSV 900dm3·h-1·g-1, TOS 240min Ref.-Cat. 114 4. Results and discussion - catalytic partial oxidation of propane conversion [%] 100 Full symbols: 1st experiment Hollow symbols...
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