A kind of propane dehydrogenation propylene catalyst and its preparation method and application
A propane dehydrogenation and catalyst technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of low conversion rate and selectivity, platinum group catalyst system It is easy to deactivate and other problems, so as to achieve the effect of improving the anti-carbon deposition performance and good industrial application prospects.
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Embodiment 1
[0022] Weigh 60g γ-Al 2 o 3 , impregnated in 0.03mol / L H at 75°C 2 PtCl 6 and 0.2mol / L SnCl 2 The aqueous solution was co-impregnated for 0.5h, and the volume of the solution was measured according to the mass content of the catalyst components. The dry precursor obtained after rotary evaporation at 75°C was placed in a muffle furnace and calcined in air at 450°C for 3h. The catalyst was taken out and placed in a tube furnace under H 2 and C 2 h 4 Calcined in a mixed atmosphere with a volume ratio of 1:1 for 15 minutes at a temperature of 500°C. Finally, the Pt-Sn-C propane dehydrogenation catalyst 1 was obtained by hydrogen reduction at 580° C. for 1 h, wherein the mass content of platinum was 0.5%, the mass content of Sn was 1.5%, and the mass content of carbon was 0.1%.
Embodiment 2
[0024] Weigh 60g γ-Al 2 o 3 , impregnated in 0.03mol / L H at 75°C 2 PtCl 6 and 0.2mol / L SnCl 2 The aqueous solution was co-impregnated for 0.5 h, and the volume of the solution was measured according to the mass content of the catalyst components. The dry precursor obtained after rotary evaporation at 75 ° C was placed in a muffle furnace and calcined in air at 650 ° C for 3 h. The catalyst was taken out and placed in a tube furnace under H 2 and C 2 h 4 Calcined in a mixed atmosphere with a volume ratio of 1:30 for 3 minutes at a temperature of 300°C. Finally, the Pt-Sn-C propane dehydrogenation catalyst 2 was obtained by hydrogen reduction at 580° C. for 1 h, wherein the mass content of platinum in the catalyst 2 was 0.3%, the content of Sn was 0.5%, and the content of carbon was 0.5%.
Embodiment 3～6
[0026] The preparation method is the same as that of Example 1, but the mass content of catalyst active components and additives is different, and catalysts 3-6 are prepared. Catalyst 3 has a platinum mass percentage of 0.2%, a Sn content of 0.6%, and a carbon content of 0.025%. Catalyst 4 has a platinum mass percentage of 0.2%, a Sn content of 0.6%, and a carbon content of 0.1%. In the catalyst 5, the mass percentage of platinum is 0.1%, the content of Sn is 2.5%, and the content of carbon is 0.1%. In the catalyst 6, the mass percentage of platinum is 0.5%, the content of Sn is 0.3%, and the content of carbon is 0.1%.
[0027] The catalyst prepared by the above method was used in the propane dehydrogenation experiment in a fixed-bed reactor. Among them, the catalyst filling volume is 30ml, and the propane volume space velocity is 500~1500h -1 , the reaction pressure is normal pressure, the reactor inlet temperature is 540-620°C, and the propane dehydrogenation product is a...
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