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Structural, textural and toluene adsorption properties of NH4HF2 and alkali modified USY zeolite
Feng, Aihu; Yu, Yang; Mi, Le; Cao, Yunzhen; Yu, Yun; Song, Lixin
2019-12-01
Source PublicationMICROPOROUS AND MESOPOROUS MATERIALS
ISSN1387-1811
Volume290
SubtypeArticle
AbstractThe non-framework aluminum is inevitably formed in the-process of preparing the ultra-stable Y zeolite (USY), which severely blocks the mesopores of USY zeolite. It is necessary to treat the USY with the appropriate acid and/or alkali. In this paper, the USY zeolite is firstly dealuminated with NH4HF2 solution and then desiliconized with NaOH or NH4OH solution. The effect and mechanism of NH4HF2 and different alkali treatments on the structural and textural property of USY zeolite are elaborately demonstrated. It is found that the non-framework Al remaining in the mesopores of USY is significantly removed by the NH4HF2 solution. The desiliconization reaction is more likely to start near the mesoporous wall because the Al concentration in here is low and the repulsive force against OH- is weak. The OH- ions from NaOH solution not only etch the framework Si near the inner wall of the mesopores, but also remove the Si on the surface of NH4HF2-etched USY zeolite. However, the concentration of OH- ions is too low when NH4OH is used as the desiliconization agent, the OH- ions just react with silicon around the mesopores. Therefore, the NaOH/NH4HF2-etched USY contains both some macropores and macropores, and the NH4OH/NH4HF2-etched USY only possesses more mesopores with pore sizes of similar to 10 nm. In addition, NaOH/NH4HF2-etched USY exhibits excellent toluene adsorption performance at low pressure stage, while NH4OH/NH4HF2-etched USY has the highest adsorption capacity on toluene at high pressure stage.
KeywordNH4HF2 NaOH NH4OH Modification USY
DOI10.1016/j.micromeso.2019.109646
Language英语
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science
PublisherELSEVIER
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/26715
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. Structural, textural and toluene adsorption properties of NH4HF2 and alkali modified USY zeolite[J]. MICROPOROUS AND MESOPOROUS MATERIALS,2019,290.
APA Feng, Aihu,Yu, Yang,Mi, Le,Cao, Yunzhen,Yu, Yun,&Song, Lixin.(2019).Structural, textural and toluene adsorption properties of NH4HF2 and alkali modified USY zeolite.MICROPOROUS AND MESOPOROUS MATERIALS,290.
MLA Feng, Aihu,et al."Structural, textural and toluene adsorption properties of NH4HF2 and alkali modified USY zeolite".MICROPOROUS AND MESOPOROUS MATERIALS 290(2019).
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