Heteropolyacid ammonium salt catalyst and its preparation method
A heteropolyacid ammonium salt and catalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problem of selectivity and activity decline, and equipment requirements are very high High and low temperature problems such as poor activity, to achieve the effect of reducing interaction, reducing excessive reaction, and concentrated distribution of acidic components
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Embodiment 1
[0040] (1) Preparation of catalyst:
[0041] 87.3g alumina carrier (pore volume 0.70mL / g, specific surface area 300m 2 / g, spherical shape, particle diameter 0.4mm~0.6mm) was added to 200mL cyclohexane solution containing 12.2g dodecyltrimethoxysilane, reacted at 50℃ for 3.0h, and dried at 70℃ for 8h to obtain the catalyst Precursor A; then added to 200mL of 5# diesel oil, filtered after soaking for 30min, the obtained material was placed in a low-temperature reaction bath at 0°C, and then 150mL of an aqueous solution containing 43.7g of citric acid was added, and after soaking for 30min, the solution was poured out. Then add 150mL ammonium carbonate solution with a mass fraction of 30% for immersion for 5min, pour out the solution, then add 100mL aqueous solution containing 8.3g phosphotungstic acid and 10.2g ferric nitrate, immerse for 30min and filter, and put the obtained solid in a relative vacuum At -0.1MPa, dry at 110°C for 8.0h, and then calcined at 500°C for 3.0h to ...
Embodiment 2
[0047] (1) Preparation of catalyst:
[0048] 77.9g alumina carrier (pore volume 0.70mL / g, specific surface area 300m 2 / g, spherical shape, particle diameter 0.4mm~0.6mm) was added to 200mL cyclohexane solution containing 22.2g hexadecyltrimethoxysilane, reacted at 50°C for 3.0h, dried at 70°C for 8h to obtain the catalyst Precursor A; then added to 200mL of 0# diesel oil, soaked for 30min and then filtered, the obtained material was placed in a low-temperature reaction bath at -10°C, and then 150mL of an aqueous solution containing 77.9g of citric acid was added, and after soaking for 30min, the solution was poured out , then add 150mL ammonium carbonate solution with a mass fraction of 30% for immersion for 5min, pour out the solution, then add 100mL aqueous solution containing 15.6g phosphotungstic acid and 15.3g ferric nitrate, filter after immersion for 30min, and put the obtained solid in a relative vacuum At -0.1MPa, dry at 110°C for 8.0h, and then calcined at 470°C fo...
Embodiment 3
[0054] (1) Preparation of catalyst:
[0055] 68.1g alumina carrier (pore volume 0.70mL / g, specific surface area 300m 2 / g, spherical shape, particle diameter 0.4mm~0.6mm) was added to 200mL cyclohexane solution containing 34.6g octadecyltrimethoxysilane, reacted at 50°C for 3.0h, dried at 70°C for 8h to obtain the catalyst Precursor A; then added to 200mL-10# diesel oil, filtered after soaking for 30min, the obtained material was placed in a low-temperature reaction bath at -20°C, and then 150mL of an aqueous solution containing 81.7g of citric acid was added, and after soaking for 30min, the solution was Pour it out, then add 150mL of ammonium carbonate solution with a mass fraction of 30% and soak for 5min, pour out the solution, then add 100mL of an aqueous solution containing 22.4g of phosphotungstic acid and 20.4g of ferric nitrate, soak for 30min and then filter, and the obtained solid is in Under the relative vacuum degree of -0.1MPa, dry at 110°C for 8.0h, and then ca...
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