| 碱金属盐对ZSM-5分子筛晶化的影响 |
| Effect of Alkali Metal Salt on Crystallization of ZSM-5 Zeolite |
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| 摘要: |
| 关键词: 纳米ZSM-5分子筛 微米ZSM-5分子筛 碱金属盐 |
| 基金项目: |
| Abstract: Effect of different alkali metal salts on the crystal size and the crystallization rate of ZSM-5 zeolite was de-tailedly investigated in this paper. The samples prepared by adding the different alkali metal salts were character-ized by using XRD， TEM， TG-DSC， BET and IR techniques. The XRD results showed that， for the nanosized ZSM-5 zeolite， the characteristic peaks broadened on the XRD patterns in comparison with the microsized ZSM-5 zeolite. The SEM results verified that the crystal size of zeolites prepared by adding different alkali metal salts had different results， and adding NaCl， NaC2H3O2 and KCl showed the better effect of reducing crystal size， which are about of 40～60nm size. The crystallization curve of adding the different alkali metal salts suggested that the crystallization rate was significantly affected by the anions in the alkali metal salt besides the cations. Moreover， the crystal size likewise depended on the anion in the alkali metal salt. In addition， the BET results suggested that the nanosized ZSM-5 zeolite possessed a larger outer surface area in comparison with the microsized ZSM-5 zeolite. The thermostability of the samples was determined by TG-DSC technique， indicating that the nanosized ZSM-5 zeolite had a poor thermostability as compared with the microsized ZSM-5 zeolite. The possible difference of the samples with different crystal sizes on IR spectra was also given. |
| Keywords: nanosized ZSM-5 zeolite microsized ZSM-5 zeolite alkali metal salt |
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| 程志林,晁自胜,林海强,万惠霖.碱金属盐对ZSM-5分子筛晶化的影响[J].无机化学学报,2003,19(4):396-400. |
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