A kind of composite adsorbent and its preparation method and application
A composite adsorption and template technology, applied in the chemical industry, can solve the problems of easy escape and even decomposition of organic amines, and achieve the effects of high adsorption capacity and effective utilization of amines, improved thermal stability, and mild conditions.
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Embodiment 1
[0039] At 50°C, stir and dissolve 4.80g of cetyltrimethylammonium bromide (CTAB) in 240.00g of deionized water; add 5.72g of tetraethoxysilane (TEOS) and continue stirring for 30min before adding 0.49 g of γ-mercaptopropyltriethoxysilane and 0.25 g of H 2 o 2 (30wt%), then added dropwise 25% ammonia solution to adjust the pH to about 10.5, and after continuing to stir for 2h, the resulting white emulsion was put into a 200ml hydrothermal kettle, and reacted at 100°C for 24h. With 300ml ethanol-hydrochloric acid solution ( ) was repeatedly refluxed three times to remove the templating agent. Finally, it was dried under vacuum at 60°C overnight, and this was the modified MCM-41 carrier, which was designated as 7SBA-15. Stir and dissolve 2.00g polyethyleneimine (PEI) and 1.00g tetraethylenepentamine (TEPA) in 40ml of methanol solution at room temperature, then add the above-mentioned modified carrier material according to the amine loading of 50wt%, and continue stirring for ...
Embodiment 2
[0041] Under the condition of 50°C, stir and dissolve 12.00g CTAB in 25.33g deionized water; then add 0.45g NaOH, continue stirring for 30min, then add 4.26g tetraethoxysilane, 0.41g mercaptopropylmethyldimethoxy silane, 5.15g of H 2 o 2 (30wt%). Stirring was continued for 1 h, and the obtained white emulsion was put into a 200 ml hydrothermal kettle, and reacted at 100° C. for 48 h. With 500ml ethanol-hydrochloric acid solution ( ) was repeatedly refluxed three times to remove the templating agent. Finally, it was dried under vacuum overnight at 80° C., and this was the modified MCM-48 carrier, denoted as 10MCM-48. Stir and dissolve 3g of pentaethylenehexamine (PEHA) in 40ml of methanol solution at room temperature, then add the above-mentioned modified carrier material according to the amine loading capacity of 30wt%, and continue stirring for 3h, evaporate the solvent to dryness, and then vacuum-dry at 100°C overnight. The obtained composite adsorbent is denoted as 3...
Embodiment 3
[0043] Under the conditions of vigorous stirring at 35°C, 1.5g polyethylene glycol (PEG) was dissolved in 30g ethanol solution to form an emulsion, then 0.24g (3-mercaptopropyl) trimethoxysilane and 2.72g H 2 o 2 (30wt%), continue to stir for 45min, add dropwise 4.75g of tetraethoxysilane, use HCl (3.0g) solution to adjust the pH to about 7, and continue to stir for 24h. With 300ml ethanol-hydrochloric acid solution ( ) was repeatedly refluxed three times to remove the templating agent. Finally, it was dried under vacuum overnight at 100° C., and this was the modified MCM-50 carrier, denoted as 5MCM-50. Stir and dissolve 2g of polyethylene polyamine (PEPA) in 30ml of methanol solution at room temperature, then add the above-mentioned modified carrier material according to the amine loading of 40wt%, and continue to stir for 2h, evaporate the solvent to dryness and vacuum dry at 100°C overnight. The resulting composite adsorbent is denoted as 40PEPA / 5MCM-50. The CO of thi...
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