Through analysis and comparison of domestic and foreign research progress of effects of alkali/alkaline earth metal on coal pyrolysis

the existing research methods and current problems are summarized

and the development direction of the future coal catalytic pyrolysis technology is proposed.The results show that

due to the limited contact area

the catalyst can not play the optimal performance by using the mechanical mixing method.The ion exchange method and impregnation method can make the catalyst play better catalytic properties

but the operation process is complex

and the catalyst is not easy to be recycled

so the use of natural alkali/alkaline earth metal in coal catalytic pyrolysis is the future development direction of coal pyrolysis technology.The sequential extraction method has limitations and the research results are controversial.With the help of the special selective complexing ability of crown ether with alkali/alkaline earth metal

the influence of inherent single alkali/alkaline earth metal on coal pyrolysis is researched

and laying a foundation for the natural alkali/alkaline earth metal in coal catalytic pyrolysis technology development.