Catalyst for preparing tetrafluoroethylene and hexafluoropropylene by catalytic cracking of trifluoromethane and preparation method thereof
A trifluoromethane, catalytic cracking technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low catalyst conversion rate and low temperature reaction effect It can improve the service life and application performance, improve the low-temperature reaction activity, and improve the anti-carbon deposition ability.
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Embodiment 1
[0032] A preparation method of a catalyst for preparing tetrafluoroethylene and hexafluoropropylene by catalytic cracking of trifluoromethane, comprising the steps of:
[0033] take Al 2 O 3 100g of the carrier was put into a drying box and dried at 100°C for 3h; 13.5g La (NO 3 ) 3 Dissolve in 100ml of pure water to prepare an impregnation solution; put the dried carrier into the impregnation solution, soak it for 20min, take it out, put it in a drying box and dry it at 100 ℃ for 3h to obtain the precursor; take it out, put it in a roasting furnace, It was calcined at 400 °C for 6 h in a nitrogen atmosphere. Take out the calcined precursor and put it in In the reaction tube, pass N 2 , N 2 The flow rate is 300ml / min, and it is dried at a temperature of 300°C for 24h. Then pass trifluoromethane gas at 300°C for fluorination at a flow rate of 6 L / min, and turn off nitrogen after 2 h; pass trifluoromethane alone at a flow rate of 6 L / min, fluorination at 350° C. for 60 h, a...
Embodiment 2
[0035] A preparation method of a catalyst for preparing tetrafluoroethylene and hexafluoropropylene by catalytic cracking of trifluoromethane, comprising the steps of:
[0036] take AlF 3 100g of the carrier was put into a drying box and dried at 100°C for 3h; 13.5g La (NO 3 ) 3 Dissolve in 100ml of pure water to prepare an impregnation solution; put the dried carrier into the impregnation solution, soak it for 20min, take it out, put it in a drying box and dry it at 100 ℃ for 3h to obtain the precursor; take it out, put it in a roasting furnace, It was calcined at 400 °C for 6 h in a nitrogen atmosphere. Take out the calcined precursor and put it in In the reaction tube, pass N 2 , N 2 The flow rate is 300ml / min, and it is dried at a temperature of 300°C for 24h. Then pass trifluoromethane gas at 300°C for fluorination at a flow rate of 6 L / min, and turn off nitrogen after 2 h; pass trifluoromethane alone at a flow rate of 6 L / min, fluorination at 350° C. for 60 h, and...
Embodiment 3
[0038] A preparation method of a catalyst for preparing tetrafluoroethylene and hexafluoropropylene by catalytic cracking of trifluoromethane, comprising the steps of:
[0039] take Al 2 O 3 100g of the carrier was put into a drying box and dried at 100°C for 3h; 13.5g of CsNO 3 Dissolve in 100ml of pure water to prepare an impregnation solution; put the dried carrier into the impregnation solution, soak it for 20min, take it out, put it in a drying box and dry it at 100 ℃ for 3h to obtain the precursor; take it out, put it in a roasting furnace, It was calcined at 400 °C for 6 h in a nitrogen atmosphere. Take out the calcined precursor and put it in In the reaction tube, pass N 2 , N 2 The flow rate is 300ml / min, and it is dried at a temperature of 300°C for 24h. Then pass trifluoromethane gas at 300°C for fluorination at a flow rate of 6 L / min, and turn off nitrogen after 2 h; pass trifluoromethane alone at a flow rate of 6 L / min, fluorination at 350° C. for 60 h, and...
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