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Citation: Zeng Hong, Jiang Hui-Wen, Long Ying-Cai, Sun Yao-Jun, Wang Li-Ping, Wu Tai-Liu. The Influence of Micro Structures of Silicalite and Rich-Silica ZSM-5 on Desorption Properties of p-xylene[J]. Acta Physico-Chimica Sinica, ;1995, 11(03): 252-256. doi: 10.3866/PKU.WHXB19950313 shu

The Influence of Micro Structures of Silicalite and Rich-Silica ZSM-5 on Desorption Properties of p-xylene

1.
Department of Chemistry,Fudan University,Shanghai 200433

Received Date: 15 November 1993
Available Online: 15 March 1995

The structures of silicalite-1 and H、 Na form of ZSM-5 with various SiO2/Al2O3 ratios were characterized by powder XRD, 29Si MAS NMR, and the desorption process of р-xylene (p-x) on the zeolites was investigated by using TG/DTG/DTA. SiOH defects of ZSM-5 have no relation with the content of structural Al. Silicalite-1 possesses perfect framework structure without SiOH defects and structural Al. On a curve of TG/DTG/DTA, p-x adsorbed by silicalite completely desorbs in the range of 57-174℃ by two steps, accompanied with endothermal effect. While on the TG/DTG/DTA curves of H, Na-ZSM-5, there is a third adsorption step of p-x in the range of 180-600℃ with exothermic effect. Below 180℃ the number of desorbed p-x molecules is related to pore space, but over 180℃, it is related to SiOH and positive ion linking with the structural Al.
- ZSM-5,
- Silicalite-1,
- SiOH defects,
- Desorption,
- ²⁹Si MAS NMR,
- TG/DTG/DTA
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