A kind of keggin type heteropolyacid-silicon oxide catalyst with mesopore structure and preparation method thereof
A silicon oxide and catalyst technology, applied in the field of catalysis, can solve the problems of poor reusability, easy dissolution and removal of active component heteropolyacids, etc., and achieve the effects of easy separation and recovery, easy industrial production, and high activity
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Embodiment 1
[0030] 5wt% of the mesoporous structure (the weight percent of phosphotungstic heteropolyacid in the catalyst, the same below) Keggin type heteropolyacid-silicon oxide catalyst, the preparation steps are as follows:
[0031] Dissolve 2g of P123 in 70mL of hydrochloric acid solution (hydrochloric acid: water volume ratio is 1:6, the same below) at 40°C, dissolve 0.0649g of phosphotungstic heteropoly acid in 10mL of deionized water, and slowly pour the phosphotungstic acid solution into P123 solution, and added 4.6mL tetraethyl orthosilicate dropwise, stirred at a constant temperature for 24 hours, then stopped stirring, raised the temperature to 90°C to maintain a constant temperature, and stood it under normal pressure for 24 hours, suction filtered and washed with deionized water, and the obtained white filter cake was placed in After drying at room temperature, grinding, and roasting at 400°C for 5 hours, a 5wt% phosphotungstic heteropolyacid-silicon oxide catalyst was obtain...
Embodiment 2
[0033] 5wt% of the mesoporous structure (the weight percent of silicotungstic heteropolyacid in the catalyst, the same below) Keggin type silicotungstic heteropolyacid-silica catalyst, the specific preparation steps are as follows:
[0034] Dissolve 2g of P123 in 70mL of hydrochloric acid solution (1:6) at 40°C, dissolve 0.0649g of silicotungstic acid in 10mL of deionized water, slowly pour the silicotungstic acid solution into the P123 solution, and add 4.6mL of orthosilicic acid dropwise Ethyl ester, stirred at constant temperature for 24 hours, then stopped the stirring, raised the temperature to 90°C to maintain a constant temperature, stood still at normal pressure for 24 hours, filtered with suction, washed with deionized water, dried the obtained white filter cake at room temperature, and ground it under the condition of 400°C Calcined for 5 hours to obtain 5wt% silicotungstic heteropolyacid-silica catalyst with an average pore diameter of 4.79nm and a specific surface a...
Embodiment 3
[0036] The 10wt% phosphotungstic heteropoly acid-silicon oxide catalyst with mesoporous structure, the specific preparation steps are as follows:
[0037] Dissolve 2g P123 in 70mL hydrochloric acid solution (1:6) at 40°C, dissolve 0.1376g phosphotungstic acid in 10mL deionized water, slowly pour the phosphotungstic acid solution into the P123 solution, and add 4.6mL orthosilicate dropwise Ethyl ester, stirred at constant temperature for 24 hours, then stopped the stirring, raised the temperature to 90°C to maintain a constant temperature, stood still at normal pressure for 24 hours, filtered with suction, washed with deionized water, dried the obtained white filter cake at room temperature, and ground it under the condition of 400°C Calcined for 5 hours to obtain 10wt% phosphotungstic heteropolyacid-silica catalyst with an average pore diameter of 5.11nm and a specific surface area of 971m 2 / g.
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