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Synthesis and characterization of hierarchical Y zeolites using NH4HF2 as dealumination agent
Feng, Aihu; Yu, Yang; Mi, Le; Cao, Yunzhen; Yu, Yun; Song, Lixin
2019-05-15
Source PublicationMICROPOROUS AND MESOPOROUS MATERIALS
ISSN1387-1811
Volume280Pages:211
SubtypeArticle
AbstractIn this work, the hierarchical Y zeolites are firstly obtained by etching NaY zeolites with different NH4HF2 solutions. The morphology and microstructure, toluene adsorption property of as-prepared hierarchical Y zeolites are characterized. The results demonstrate that the mesoporous number and size, the n(SiO2)/n(Al2O3) value of hierarchical Y are increased with NH4HF2 concentration. The 0.3M NH4HF2-etched NaY exhibits satisfactory crystallinity, suitable mesoporous content and better toluene adsorption performance. The NH4HF2-etched NaY is an excellent material for pressure swing adsorption. Furthermore, the synthesis mechanism of hierarchical Y has been elaborately demonstrated. The synergistic effect of H+ and F- is beneficial to deal-umination as well as the introduction of mesoporous. The NH4HF2 ionizes into positive H+ and negative F- at a very slow rate, which avoids the concentration of H+ and F- going up suddenly. Under the circumstances, the dealumination reaction between NH4HF2 and NaY zeolites is more sustained and mild, and the crystallinity of hierarchical Y zeolites is higher than that of the HCl/NH4F-etched or HF/NH4F-etched NaY. This work presents an effective method to synthesize the hierarchical Y zeolites.
KeywordNH4HF2 Hierarchical Y zeolites Dealumination Toluene adsorption
DOI10.1016/j.micromeso.2019.01.039
Language英语
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/27116
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Feng, Aihu,Yu, Yang,Mi, Le,et al. Synthesis and characterization of hierarchical Y zeolites using NH4HF2 as dealumination agent[J]. MICROPOROUS AND MESOPOROUS MATERIALS,2019,280:211.
APA Feng, Aihu,Yu, Yang,Mi, Le,Cao, Yunzhen,Yu, Yun,&Song, Lixin.(2019).Synthesis and characterization of hierarchical Y zeolites using NH4HF2 as dealumination agent.MICROPOROUS AND MESOPOROUS MATERIALS,280,211.
MLA Feng, Aihu,et al."Synthesis and characterization of hierarchical Y zeolites using NH4HF2 as dealumination agent".MICROPOROUS AND MESOPOROUS MATERIALS 280(2019):211.
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