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Silica aluminas



Sasol markets a wide range of doped materials. Silica doped materials are sold worldwide under the trade names SIRAL® and SIRALOX® for their silica-alumina hydrates and oxides respectively. The know-how gained from the production of high purity alumina products has been carried over to our range of doped materials so that the quality of the products are uncompromised and are manufactured to the same high standards. The use of dopants affects the physical properties of alumina in many ways. SIRAL® and SIRALOX® is not only more thermal stable than the high purity aluminas but they are also relatively acidic materials. Both the hydrate and the oxide are suitable carriers for catalytic processes where surface acidity is required to enhance the catalytic activity.


SIRAL® / SIRALOX®



Silica Aluminas (Alumina phase = Boehmite)

Typical chemical and physical properties

 

SIRAL
1

SIRAL
 5

SIRAL
 10

SIRAL
 20

SIRAL
 30

SIRAL
 40

Al2O3 + SiO2

%

75

75

75

75

75

75

LOI

%

25

25

25

25

25

25

Al2O3 : SiO2

%

99:1

95:5

90:10

80:20

70:30

60:40

C

%

0.2

0.2

0.2

0.2

0.2

0.2

Fe2O3

%

0.02

0.02

0.02

0.02

0.02

0.02

Na2O

%

0.005

0.005

0.005

0.005

0.005

0.005

 

 

 

 

 

 

 

 

Loose bulk density

[g/l]

600-800

450-650

400-600

300-500

250-450

250-450

Particle size (d50)

[µ m]

50

50

50

50

50

50

 

 

 

 

 

 

 

 

Surface area (BET)*

[m2/g]

280

370

400

420

470

500

Pore volume*

[ml/g]

0.50

0.70

0.75

0.75

0.80

0.90

* After activation at 550 °C for 3 hours.

Above Silica-Aluminas are also available as activated materials under the trade name SIRALOX®.