Table 1 Compositions (in mole%) of kaolin, diatomaceous earth, leached metakaolin, leached diatomaceous earth and ZSM-5 products by ICP-SFMS

SiO₂

67.7

95.9

94.0

78.8

96.4

96.0

Al₂O₃

30.1

2.92

4.15

5.22

2.17

2.40

CaO

0.15

0.12

0.10

4.44

0.49

0.63

Fe₂O₃

0.37

0.16

0.18

0.22

0.06

0.07

K₂O

1.13

0.60

0.65

1.29

0.33

0.30

MgO

0.59

0.19

0.22

3.30

0.19

0.23

Na₂O

0.16

0.08

0.65

6.78

0.35

0.37

Mol SiO ₂ /Al ₂ O ₃

2.2

33

23

15

44

40