CAN

Cancrinite

Si(50), Al(50)

Contributed by J.-Ch. Buhl

Verified by C. Williams and by M. Bottale

Type Material Na8[AlSiO4]6CO3. 4H2O

Method J.-Ch. Buhl [1]

Batch Composition 93 Na2O : Al2O3 : 2 SiO2 : 10 NaHCO3 : 1386 H2Oa

Source Materials

distilled water
sodium hydroxide (Merck pellets, analytical grade)
kaolin (Fluka)
sodium bicarbonate (Merck, analytical grade, NaHCO3)

Batch Preparation (for 0.6 g product)

(1) [45 mL water + 14.4 g sodium hydroxide], stir until dissolved
(2) [(1) + 0.5 g kaolin + 1.7 g sodium bicarbonate], mix until uniform slurry

Crystallization

Vessel: Teflon-lined steel autoclave
Temperature: 200¡C
Time: 48 hours
Agitation: none

Product Recovery

(1) Cool to ambient temperature. Filter
(2) Wash free of NaOH residuals (approximately 150 mL water)
(3) Dry at 80¡C
(4) Yield: close to 100%

Product Characterization

XRD: CAN; small amounts of a disordered phase between CAN and SOD and amorphous material could be detected in the polycrystalline sample [1,2]
Elemental Analysis: Na8[AlSiO4]6CO3. 4H2Ob
Crystal Size and Habit: small elongated needles
Click here to view XRD pattern

References

[1] J.-Ch. Buhl, Thermochiniica Acta 178 (1991) 19
[2] G. Hermeler, J.-Ch. Buhl, W. Hoffmann, Catalysis Today 8 (1991) 415
[3] C. Liu, S. Li, K. Tu, R Xu, J. Chem. Soc., Chem. Commun. (1993) 1645

Notes

a. CAN-formation in the water-free system is reported using butane-1,3-diol. [3]
b. Analysis of the guest anions according to the combination of simultaneous thermal analysis (TG, DTG, DTA), IR-spectroscopy and MAS NMR (13C).
c. Single crystals can be prepared from a gel consisting of [50 mg kaolin (heated at 1400¡C for two hours) + 168 mg NaHCO3 + 320 mg NaOH + 1 mL distilled water] treated at 500¡C for 48 hours in a silver-lined steel autoclave.