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

From: Comparison between leached metakaolin and leached diatomaceous earth as raw materials for the synthesis of ZSM-5

Composition Kaolin Leached metakaolin ZSM-5 (K) Diatomaceous earth Leached diatomaceous earth ZSM-5 (D)
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