72
T. Rakitskaya et al.
Table 4
Generalized data on the properties of OMS-2 synthesized by different methods and their activity in the ozone decomposition
Parameter
Sample
OMS-2(MS)
OMS-2(SG)
OMS-2(Ref)
OMS-2(SSt)
Phase composition, %
K
x Mn
8 O
16
− 100
K
x Mn
8 O
16
− 100
K
x Mn
8 O
16-90.5 Mn
2 O
3-9.5
K
x Mn
8 O
16-85.3
β-MnO 2
− 14.7
D, nm (cryptomelane)
14
36
15
10
V, Å 3
(cryptomelane)
276.527
275.476
275.095
277.03
S
sp (BET), m 2
/g
105.0
47.6
112.0
63.6
d
m , nm
34.9
16.9
34.0
17.8
pH
eq
5.4
7.3
3.0
11.6
a,
mmol/g
at RH
= 65%
1.08
0.84
1.72
1.59
τ MPC , min
1050
–
30
–
τ 1/2 , min
– a
660
420
100
Q
exp ·10 5
,
moles of O
3
343.0 a
86.6
54.4
10.8
a
—the experiment was stopped at C f
O3 = 0.28 mg/m 3
T. Rakitskaya et al.
Table 4
Generalized data on the properties of OMS-2 synthesized by different methods and their activity in the ozone decomposition
Parameter
Sample
OMS-2(MS)
OMS-2(SG)
OMS-2(Ref)
OMS-2(SSt)
Phase composition, %
K
x Mn
8 O
16
− 100
K
x Mn
8 O
16
− 100
K
x Mn
8 O
16-90.5 Mn
2 O
3-9.5
K
x Mn
8 O
16-85.3
β-MnO 2
− 14.7
D, nm (cryptomelane)
14
36
15
10
V, Å 3
(cryptomelane)
276.527
275.476
275.095
277.03
S
sp (BET), m 2
/g
105.0
47.6
112.0
63.6
d
m , nm
34.9
16.9
34.0
17.8
pH
eq
5.4
7.3
3.0
11.6
a,
mmol/g
at RH
= 65%
1.08
0.84
1.72
1.59
τ MPC , min
1050
–
30
–
τ 1/2 , min
– a
660
420
100
Q
exp ·10 5
,
moles of O
3
343.0 a
86.6
54.4
10.8
a
—the experiment was stopped at C f
O3 = 0.28 mg/m 3