Catalyst for preparing chlorotrifluoroethene from trichlorotrifluoroethane through catalytic hydrodechlorination and preparation method of catalyst
A technology of trifluorotrichloroethane and chlorotrifluoroethylene, which is applied in the field of catalysts, can solve the problems of low reaction selectivity, many side reactions, easy deactivation and stability, and achieve good reaction selectivity, mild reaction conditions, Operation stable and good effect
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Embodiment 1
[0022] Using cobalt (first catalyst) and chromium (second catalyst) supported on SiO 2 In addition, the auxiliary agent is potassium alkali metal.
[0023] SiO at 400°C 2 The particles are roasted, and then a certain amount of CoCl is configured 2 ·6H 2 O, CrCl 3 ·6H 2 O, Ni(H 2 PO 2 )·6H 2 O and KCl 6H 2 O mixed solution, the mass fractions were 3.1%, 5.2%, 15.6% and 4.5%, and then the SiO 2 The particles were impregnated with equal volume and dried at 60 °C for 12 h. The dried material was put into a tube furnace, nitrogen was introduced, the temperature was raised to 240 °C at a rate of 6 °C / min, the reaction time was 4 h, and then naturally cooled to room temperature, and finally O 2 2% N 2 The passivation treatment was carried out for 4 hours. In the catalyst thus prepared, the mass content of Co was 2.0%, Cr was 2.6%, and K was 2.5%. The catalyst is used to carry out hydrodechlorination reaction of trifluorotrichloroethane, the conversion rate is 97.5%, and t...
Embodiment 2
[0025] Cobalt (first catalyst) and manganese (second catalyst) supported on pretreated SiO 2 Above, the auxiliary agent is selected from the rare earth metal rhenium.
[0026] SiO at 400°C 2 The particles are roasted, and then a certain amount of CoCl is configured 2 ·6H 2 O, MnCl 2 4H 2 O, Ni(H 2 PO 2 )·6H 2 The mixed solution of O and perrhenic acid, the mass fractions are 2.2%, 4.3%, 9.8% and 2.7%, and then the SiO 2 The particles were impregnated with equal volume and dried at 80°C for 16h. The dried material was put into a tube furnace, nitrogen was introduced, the temperature was raised to 300 °C at a rate of 8 °C / min, the reaction time was 6 h, and then naturally cooled to room temperature, and finally O 2 2% N 2 The passivation treatment was carried out for 4 hours. In the catalyst thus prepared, the mass content of Co was 2.5%, Cr was 2.8%, and Re was 3.0%. The catalyst is used to carry out hydrodechlorination reaction of trifluorotrichloroethane, the conve...
Embodiment 3
[0028] Cobalt (first catalyst) and manganese (second catalyst) supported on pretreated SiO 2 Above, the auxiliary agent is selected from the rare earth metal rhenium.
[0029] SiO at 400°C 2 The particles are roasted, and then a certain amount of CoCl is configured 2 ·6H 2 O, MnCl 2 4H 2 O, Ni(H 2 PO 2 )·6H 2 The mixed solution of O and perrhenic acid, the mass fractions are 5.3%, 6.2%, 12.8% and 2.1%, and then the SiO 2 The particles were impregnated with equal volume and dried at 80°C for 16h. The dried material was put into a tube furnace, nitrogen was introduced, the temperature was raised to 300 °C at a rate of 8 °C / min, the reaction time was 6 h, and then naturally cooled to room temperature, and finally O 2 2% N 2The passivation treatment was carried out, and the treatment time was 4 hours. In the catalyst thus prepared, the mass content of Co was 3.3%, that of Cr was 3.0%, and that of Re was 3.8%. The catalyst is used to carry out hydrodechlorination reactio...
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