【Abstract】 In this paper,the systems of KCl/HZSM 5 and NaCl/HZSM 5 have been studied by XRD.The results show that the salts can disperse on the HZSM 5 surface forming a non crystalline layer.There is a critical dispersion capacity.When the salt content exceeds this threshold,the residual crystalline salt appears.Furthermore,the relationship between dispersion thresholds and calcination temperature has been investigated,the critical dispersion temperature of KCl and NaCl on the HZSM 5 surface has been found,and the dispersion threshold of salts from 450℃ to 700℃ has been measured.更多还原