Zeolites have been widely used as adsorbents, heterogeneous catalysts and ion-exchange materials due to their unique pore structure, strong acidity and high hydrothermal stability. At present, most of zeolites are synthesized by hydrothermal method, involving the use of commercial silicon- and aluminum-containing reagents and organic templates, which leads to high cost, low efficiency and seriously environmental pollution. Therefore, the research of highly efficient and green routes for synthesis of zeolites is of great significance. Three aspects including the greenization of the raw materials, synthesis conditions and synthesis methods are reviewed in this paper. The existing problems and future direction of development are also put forward.

Contents
1 Introduction
2 The greenization of raw materials
2.1 Synthesis of zeolite from kaolin
2.2 Synthesis of zeolite from diatomite
3 The greenization of synthesis conditions
3.1 Directed method
3.2 Seed solution-assisted method
3.3 Crystal seed-directed method
4 The greenization of synthesis methods
5 Conclusion