Item

Fresh sample

After one year industrial operation

Upper part of upper layer

lower layer

Lower part of upper layer

Middle part of

Specific area

115.1

105.2

92.7

99.4

Pore volume

0.3609

0.2832

0.2953

0.3283

Average pore radius, nm

62.81

59.50

63.63

59.99

Most probable radius, nm

3.16

2.756

3.035

2.941

Pore distribution

<25 nm

57.47

57.79

57.31

56.48

25 - 50 nm

5.11

6.05

7.28

5.91

50 - 150 nm

13.95

20.38

22.61

27.11

>150 nm

23.39

15.79

12.79

10.51

XRD phase composition

γ-Al2O3

γ-Al2O3

γ-Al2O3

γ-Al2O3

MgAl2O4

MgAl2O4

MgAl2O4

MgAl2O4

K2SO4 (micro amount)