Heteropoly acid catalyst and preparation method thereof
A technology of catalyst and heteropolyacid, which is applied in the field of supported heteropolyacid catalyst and its preparation, can solve the problems of high reaction temperature requirements, achieve high anti-coking performance, increase total acid content, high activity and selectivity Effect
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[0020] Example 1
[0021] (1) Preparation of the carrier:
[0022] Add 2.9g of citric acid and 3.0g of polyethylene glycol 200 to deionized water to form a mixed solution, then add 33.2mL of ethyl orthosilicate, stir evenly, and add to the prepared 79.2g particle size of 0.1mm. In spherical alumina, stirred at 60 °C for 2 h, then stirred at 80 °C until gelatinized, aged at 40 °C for 8 h, then dried at 110 °C for 8 h, and calcined at 550 °C for 3 h to obtain silica-coated alumina Alumina carrier, wherein silicon oxide accounts for 10% of the weight of the carrier, the molar ratio of citric acid to silicon oxide is 0.1, and the molar ratio of polyethylene glycol 200 to silicon oxide is 0.1.
[0023] (2) Preparation of catalyst: The catalyst is prepared by supersaturation impregnation method, and the steps are as follows:
[0024] 7.1 g of boric acid and 8.3 g of phosphotungstic acid were added to deionized water to prepare a mixed solution; the prepared carrier was added to th...
Example Embodiment
[0029] Example 2
[0030] (1) Preparation of the carrier:
[0031] Add 4.8g of citric acid and 15.0g of polyethylene glycol 600 into deionized water to form a mixed solution, then add 37.8mL of ethyl orthosilicate, stir evenly, and add to the prepared 73.0g particle size of 0.5mm. In spherical alumina, stir at 60°C for 2h, then stir at 80°C until gelling, age at 40°C for 8h, then dry at 110°C for 8h, and calcinate at 550°C for 3h to obtain silica coating The alumina carrier, wherein silicon oxide accounts for 12% of the weight of the carrier, the molar ratio of citric acid to silicon oxide is 0.15, and the molar ratio of polyethylene glycol 600 to silicon oxide is 0.15.
[0032] (2) Preparation of catalyst: The catalyst is prepared by supersaturation impregnation method, and the steps are as follows:
[0033] 8.9 g of boric acid and 12.5 g of phosphotungstic acid were added to deionized water to prepare a mixed solution; the prepared carrier was added to the mixed solution, ...
Example Embodiment
[0036] Example 3
[0037] (1) Preparation of the carrier:
[0038] Add 7.6g of citric acid and 14.3g of polyethylene glycol 400 to deionized water to form a mixed solution, then add 44.9mL of ethyl orthosilicate, stir evenly, and add to the prepared 67.2g particle size of 0.3mm. In spherical alumina, stirred at 60 °C for 2 h, then stirred at 80 °C until gelatinized, aged at 40 °C for 8 h, then dried at 110 °C for 8 h, and calcined at 550 °C for 3 h to obtain silica-coated alumina Alumina carrier, wherein silicon oxide accounts for 15% of the weight of the carrier, the molar ratio of citric acid to silicon oxide is 0.2, and the molar ratio of polyethylene glycol 400 to silicon oxide is 0.18.
[0039] (2) Preparation of catalyst: The catalyst is prepared by supersaturation impregnation method, and the steps are as follows:
[0040] Add 10.6 g of boric acid and 15.6 g of phosphotungstic acid to deionized water to prepare a mixed solution; add the prepared carrier to the mixed s...
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