Catalyst for preparation of 2,3,3,3-tetrafluoropropene through selective hydrodechlorination
A technology of tetrafluoropropene and hydrodechlorination, which is applied in the fields of dehydrohalogenation preparation, physical/chemical process catalyst, organic chemistry, etc., can solve the problems of high reaction temperature, unavailable raw materials, increased production cost, etc. Good sintering ability, low raw material cost, and long service life
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Embodiment 1
[0023] According to the Co / P molar ratio of 1 / 1, 7.65g of cobalt nitrate and 3.45g of diammonium hydrogen phosphate were weighed and added to the deionized aqueous solution, and then the pH of the solution was adjusted to 2-3 with concentrated nitric acid to obtain a clear solution. An equal volume of the above solution was impregnated onto 7.9g of silica, then aged at room temperature for 12h, dried at 120°C for 12h to dry the water, and baked at 500°C for 6h to obtain CoP / SiO with a loading capacity of 30%. 2 oxide precursors. The phosphide catalyst was prepared by in-situ temperature-programmed reduction method. The temperature programming step mainly includes two steps: (1) in H 2 Under the atmosphere (flow rate 150mL / min), the temperature was raised from room temperature to 120°C at 5°C / min, and kept at 120°C for 1h to drive off the water adsorbed by the catalyst; (2) from 120°C to 120°C at a rate of 5°C / min 400°C, then raise the temperature from 400°C to 650°C at 1°C / m...
Embodiment 2
[0025] According to the Co / P molar ratio of 2 / 1, 15.2g of cobalt nitrate and 3.45g of diammonium hydrogen phosphate were weighed and added to the deionized aqueous solution, and then the pH of the solution was adjusted to 2-3 with concentrated nitric acid to obtain a clear solution. The same volume of the above solution was impregnated onto 11.5g of activated carbon, then aged at room temperature for 12h, dried at 120°C for 12h to dry the water, and dried under N 2 Calcined at 500 °C for 6 h under atmosphere to obtain Co with a loading of 30% 2 P / C oxide precursor. The phosphide catalyst was prepared by in-situ temperature-programmed reduction method. The temperature programming step mainly includes two steps: (1) in H 2 Under the atmosphere (flow rate 150mL / min), the temperature was raised from room temperature to 120°C at 5°C / min, and kept at 120°C for 1h to drive off the water adsorbed by the catalyst; (2) from 120°C to 120°C at a rate of 5°C / min 400°C, then raise the te...
Embodiment 3
[0027] According to the Fe / P molar ratio of 1 / 1, weigh 10.6g of ferric nitrate and 3.45g of diammonium hydrogen phosphate and add them to the deionized aqueous solution, then use concentrated nitric acid to adjust the pH of the solution to 2-3 to obtain a clear solution. An equal volume of the above solution was impregnated onto 7.71g of magnesium fluoride, then aged at room temperature for 12h, dried at 120°C for 12h to dry the water, and baked at 500°C for 6h to obtain FeP / MgF with a loading capacity of 30%. 2 oxide precursors. The phosphide catalyst was prepared by in-situ temperature-programmed reduction method. The temperature programming step mainly includes two steps: (1) in H 2 Under the atmosphere (flow rate 150mL / min), the temperature was raised from room temperature to 120°C at 5°C / min, and kept at 120°C for 1h to drive off the water adsorbed by the catalyst; (2) from 120°C to 120°C at a rate of 5°C / min 400°C, then raise the temperature from 400°C to 650°C at 1°C / ...
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