Catalytic coal gasification technology is essential to improve the efficiency of coal gasification. At present, alkali metals, alkaline earth metals and transition metal catalysts have poor application induced by their high cost and difficulty in recovery except for CaCO₃. Disposable catalysts have got a multitude of attention on research and application of coal gasification in recent years, which have the advantages of being cheap, disposable, environmentally friendly, and capable of adjusting the ash melt characteristic and sulfation reaction. In this paper, the progress of several kinds of disposable catalysts in the field of coal gasification is reviewed, including the catalytic properties and mechanism of catalysts such as calcium based catalysts, waste water catalysts, waste solid catalysts and biomass ash catalysts, the problems in practical application are discussed, and the challenges and perspectives of the coal gasification catalysts are also prospected.
Contents
1 Introduction
2 Types of disposable catalysts and their catalytic mechanism
2.1 Calcium based catalysts
2.2 Industrial waste water catalysts
2.3 Industrial waste solid catalysts
2.4 Biomass catalysts
3 Conclusion and outlook