Solid acid catalyst and preparation method thereof, and preparation method of diolefin compound
A solid acid catalyst and catalyst technology, applied in the direction of catalyst carrier, chemical instrument and method, physical/chemical process catalyst, etc., can solve the problems of difficult industrial production and low selectivity of isoprene, and achieve low toxicity and high yield Selectivity, the effect of reducing side effects
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[0041] The invention provides a kind of preparation method of solid acid catalyst, comprises the following steps:
[0042] a) loading the rare earth compound, the chromium source and the carrier in a solvent to obtain a catalyst intermediate;
[0043] b) drying the catalyst intermediate obtained in step a) and then roasting to obtain a solid acid catalyst.
[0044] In the invention, the rare earth compound, the chromium source and the carrier are mixed in a solvent and then loaded to obtain the catalyst intermediate. In the present invention, there is no special limitation on the mixing sequence of the rare earth compound, chromium source and additives. Preferably, the rare earth compound and chromium source are added to a solvent, and then added to the carrier for loading to obtain a catalyst intermediate. The present invention has no special restrictions on the container used when the rare earth compound, the chromium source and the carrier are mixed in a solvent, and a con...
Embodiment 1
[0100] Put 5.0g of chromium nitrate nonahydrate, 5.4g of cerium nitrate hexahydrate, 20mL of phosphoric acid and 80mL of deionized water into a 500mL round-bottomed flask, and add 40g of chromium nitrate nonahydrate and cerium nitrate hexahydrate while stirring completely. Silica, connect the round bottom flask to the slurry mixing device, at a temperature of 20 ° C, after loading for 8 hours, the catalyst intermediate is obtained;
[0101] Raise the temperature to 125°C, evaporate the moisture in the catalyst intermediate, then place the catalyst intermediate in a muffle furnace, and perform the first calcination at 350°C for 0.5h, then raise the temperature to 550°C and continue The second calcination was performed for 0.5 h to obtain a solid acid catalyst.
[0102] The present invention tests the total acid content, the ratio of the B acid active center to the L acid active center and the specific surface area of the obtained solid acid catalyst.
[0103] The test result...
Embodiment 2
[0105] Put 5.0g of chromium nitrate nonahydrate, 5.4g of cerium nitrate hexahydrate, 10mL of phosphoric acid and 80mL of deionized water into a 500mL round bottom flask, and pour it into 40g of silica particles, connect the round-bottomed flask to the slurry mixing device, and react at 95°C for 0.5h to obtain the catalyst intermediate;
[0106] Raise the temperature to 80°C, evaporate the moisture in the catalyst intermediate, then place the catalyst intermediate in a muffle furnace, and after the first calcination at 300°C for 8 hours, finally raise the temperature to 500°C, and continue the second calcination 10h, a solid acid catalyst was obtained.
[0107] The present invention tests the total acid content, the ratio of the B acid active center to the L acid active center and the specific surface area of the obtained solid acid catalyst.
[0108] The test results show that the total acid content of the solid acid catalyst obtained in the embodiment of the present invent...
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Abstract
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