Zirconium Tungstate Synthesis

1
Zirconium Tungstate Synthesis
Sol-Gel Synthesis
50 ml 0.50 M
50 ml 0.08 M
25 ml water


Viscous, white ppt
Stir 10 hours 125 ml 6 M HCl Reflux 48
hours Wash Age 7 days Calcine 873 K for 10 hours
(ZrW2O8) 13 grams (22 mmoles) 88 -- 0.012 mMol
2
Zirconium Tungstate Synthesis
Reverse Micelle Synthesis
3
Zirconium Tungstate Synthesis
Reverse Micelle Synthesis
160 ml CH 1.48 moles 124 grams
20 ml N-101 0.032 moles 21.2 grams
6.5 ml hexanol 0.052 moles 5.29 grams
w6.1
2.7 g 7.5 mmoles 3 ml water
3.7 g 1.24 mmoles 6 ml water
130 ml ethanol


4
Zirconium Tungstate Synthesis

• Addition of ethanol breaks down the interface
  layer

4.3 grams, 7.33 mmol (97.7 -- 1.21 mM left)
5
Zirconium Tungstate Synthesis
Reverse Micelle Synthesis
6
Zirconium Tungstate Synthesis
Sol-Gel 7-15 micron mean particle size,
uncontrolled shape
Reverse Micelle 300 nm and 2 mm mean particle
sizes
7
Zirconium Tungstate Synthesis
XRD 87 ZrW2O8
Zirconium tungstate
Tungsten oxide
8
Zirconium Tungstate Synthesis
rods-zirconium tungstate (1-2 mm length
and 200 nm diameter)
balls-tungsten oxide