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3Â¥2019-10-11 16:18:14
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FAU

Linde Type X     Si(55), Al(45)

Contributed by Hans Lechert and Philip Staelin

Verified by D. Ginter, by E. Basaldella, and by E. Fallabella Sousa-Aguiar

Type Material Na86Al86Si106O384 : wH2O (w ~ 260)

Method H. Lechert, H. Kacirek [1, 2]

Batch Composition NaAlO2 : 4 SiO2 : 16 NaOH : 325 H2Oa,b

Source Materials

distilled water
sodium hydroxide (99+% NaOH)
alumina trihydrate (Merck, 65% Al2O3) c
sodium silicate solution (27.35% SiO2, 8.30% Na2O, 1.37 g/mL)
Batch Preparation (for 42 g product)

(1)        [100 g water + 100 g sodium hydroxide], stir until dissolved
(2)        [(1) + 97.5 g alumina trihydrate], stir at 100¡C until dissolved, cool to 25¡C
(3)        [(2) + 202.5 g water], mix
(4)        [100 g of solution (3) + 612 g water + 59.12 g sodium hydroxide], mix until dissolved
(5)        [219.7 g sodium silicate solution + 612 g water + 59.12 g sodium hydroxide], mix until dissolved
(7)        [(4) + (5)], combine quickly and stir for 30 minutesd
Crystallization

Vessel:        polyethylene bottles
Temperature: 90¡C
Time: 8 hours
Agitation: none
Product Recovery

(1)        Filter and wash to pH < 10
(2)        Dry at 1000C, equilibrate over saturated aqueous NaCl
(3)        Yield: near 100% on Al2O3
Product Characterization

XRD 100% FAU, a0 = 24.92 Å, competing phases: LTA, GIS, ANA, SOD
Elemental Analysis: NaAlO2. 1.24 SiO2f
Crystal Size and Habit: spherical aggregates, 0.8 um dia.
2Â¥2019-10-11 11:53:32
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