A kind of magnesium sulfate ammonium double salt/porous zeolite composite material and its preparation method and application
A technology of magnesium ammonium sulfate double salt and magnesium ammonium sulfate, applied in heat exchange materials, chemical instruments and methods, sustainable manufacturing/processing, etc., can solve the problems of lack of large-scale utilization of magnesium resources and ineffective utilization, etc. Achieve dehydration/water absorption reaction, reversible water absorption/dehydration reaction, and avoid loss
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Embodiment 1
[0024] A. 2.5g halloysite nanotubes, 3.33g NaOH, 1.3gSiO 2 and 0.1gAl 2 o 3 Uniformly ground and mixed for 10 minutes, put into a nickel crucible and calcined at 400°C for 2 hours. After cooling to room temperature, 50 mL of deionized water was added to the reactant, stirred thoroughly, transferred to a stainless steel reactor with a polytetrafluoroethylene liner, aged at 40°C for 12 hours, then hydrothermally reacted at 95°C for 12 hours, filtered , After washing, dry it at 110°C for 5 hours and grind it for use. Obtain Y-type zeolite, the molecular formula is Na 2 al 2 Si 4.5 o 13 ·6H 2 O.
[0025] B. Weigh 6.15g of magnesium sulfate heptahydrate and 3.33g of ammonium sulfate and dissolve them in 7.8mL of deionized water to form a mixed solution. Stir at 70°C with a magnetic stirrer at a speed of 100 rpm for 0.5 hours, and then use ice water After cooling for 30 minutes, the precipitated crystals were filtered and dried to obtain magnesium ammonium sulfate hexahydra...
Embodiment 2
[0029] A. Take 3.0g halloysite nanotubes, 4.0g NaOH, 1.0gSiO 2 and 0.1gAl 2 o 3 , uniformly ground and mixed for 20 minutes, put into a nickel crucible, and calcined at 400°C for 2 hours. After cooling to room temperature, 60 mL of deionized water was added to the reactant, and after thorough stirring, the reactant was transferred to a stainless steel reactor lined with polytetrafluoroethylene, and aged at 40°C for 12 hours, using hydrothermal reaction, at 95°C The reaction was carried out at low temperature for 12 hours, and the obtained zeolite product was filtered, washed, dried at 150° C. for 3 hours, and finely ground for use. Get X-type zeolite, molecular formula is Na 2 al 2 Si 2.5 o 9 6.2H 2 O.
[0030] B. Weigh 7.46g of magnesium sulfate heptahydrate and 4g of ammonium sulfate and dissolve them in 9.3mL of deionized water to form a mixed solution. Stir at 70°C for 1 hour with a magnetic stirrer at a speed of 70 rpm, then cool with ice water After 30 minutes, ...
Embodiment 3
[0034] A. Take 2.3g halloysite nanotubes, 3.06g NaOH, 0.4g SiO 2 , 0.03g Al 2 o 3 , uniformly ground and mixed for 15 minutes, put into a nickel crucible, and calcined at 400°C for 2 hours. After cooling to room temperature, 40 mL of deionized water was added to the reactant, and after thorough stirring, the reactant was transferred to a stainless steel reactor with a polytetrafluoroethylene liner, and aged at 35°C for 12 hours, using hydrothermal reaction, at 95°C The reaction was carried out at low temperature for 12 hours, and the obtained zeolite product was filtered and washed, dried at 140° C. for 4 hours, and finely ground for use. Obtain Y-type zeolite, molecular formula is Na 2 al 2 Si 4.5 o 13 ·7H 2 O.
[0035] B. Weigh 9.33g of magnesium sulfate heptahydrate and 5g of ammonium sulfate and dissolve them in 11.7mL of deionized water to form a mixed solution. Stir at 70°C with a magnetic stirrer at 80 rpm for 0.5 hours, then cool with ice water After 20 minute...
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