| 摘要 |
<p>A synthetic crystalline zeolite is provided characterized by having a composition, in terms of mole ratios of oxides, in the range: 0.9 to 1.1 M2/nO:Al2O3:2.5 to 5.1 SiO2:xH2O wherein M is at least one exchangeable cation, n is the valence of M, and x is 0 to 6, and characterized by having a specified X-ray powder diffraction pattern. The zeolite may be prepared by crystallization from a reaction mixture of KOH (and optionally a minor amount of NaOH), water, a source of silica, and a source of alumina preferably derived from kaolin or halloysite. Most preferably, the source of alumina is metakaolin and the source of silica is potassium silicate.</p> |
