Geoscience Reference
In-Depth Information
Figure 6.11 Raman spectra of the gel
phase obtained during aging at ambient
temperature, and reaction at 115
C
during synthesis of faujasite zeolites
[82]
.
(g)
(f)
(e)
(d)
(c)
(b)
(a)
500
1000
1500
Figure 6.12 Crystallizaton
curve of EMT (
x
: E-4 or gel
A,
Δ
: A-1) and FAU (
K
:E-
8 or gel) for the 18-crown-6
ether preparations
[82]
.
120
100
80
60
40
20
0
0
48
96
144
t/h
192
240
288
increases significantly. After the sample has been heated for 1
5 days, the cyclic
489 cm
2
1
.
The DTG curves have been recorded for gel after different hours of aging at
room temperature by Wu and Chao
[82]
and the results are shown in
Figures 6.13
and 6.14
. The
tetrameric aluminosilicate and silicate anions are observed at 479
thermogravimetry/differential
scanning calorimetry TG/DSC
(thermal analysis with online mass spectrometry) showed three distinct stages of
