ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Synthetic zeolite. Molecular graphic of part of the structure of the synthetic zeolite ZK-5. Zeolites are used as catalysts and molecular sieves. The ions within ZK-5 (chemical formula Na30. Al30. Si66. O192. SiO4). Aluminium ions are not shown. Zeolites consist of a porous, negatively-charged, crystalline, aluminosilicate framework. Positively-charged ions can fit into the pores, which are manufactured to be the ideal size and shape to filter a particular chemical or catalyse one type of reaction.
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