The role of tetraalkylammonium for controlling dealumination of zeolite Y in acid media

被引：13
作者：
Maghfirah, Ainul [1 ]
Susanti, Yuni [1 ]
Fajar, Adroit T. N. [1 ,2 ]
Mukti, Rino R. [1 ,3 ]
Kadja, Grandprix T. M. [1 ,3 ]
机构：
[1] Inst Teknol Bandung, Div Inorgan & Phys Chem, Jl Ganesha 10, Bandung 40132, Indonesia
[2] Univ Ma Chung, Ma Chung Res Ctr Photosynthet Pigments, Villa Puncak Tidar N-01, Malang 65151, Indonesia
[3] Inst Teknol Bandung, Res Ctr Nanosci & Nanotechnol, Jl Ganesha 10, Bandung 40132, Indonesia
来源：
MATERIALS RESEARCH EXPRESS | 2019年 / 6卷 / 09期
关键词：
zeolite Y; dealumination; tetraalkylammonium; impregnation; HIERARCHICAL Y; NANOCRYSTALS; CRYSTALLINITY; MESOPOROSITY; TEMPERATURE; PERFORMANCE; YIELD; SIZE;
D O I：
10.1088/2053-1591/ab0eff
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The use of zeolite Y as a catalyst was strictly limited in the hydrophobic system due to its low Si/Al ratio. To increase the Si/Al ratio of zeolite Y, several methods have been developed although it remains a challenge. One of the methods to increase Si/Al ratio in zeolite is by means of dealumination using an acidic medium. In the present work, dealumination of zeolite Y was investigated using oxalic acid media in the presence of tetraalkylammonium (TAA) cations. The TAA cations employed in this work were tetramethylammonium (TMA), tetraethylammonium (TEA), tetrapropylammonium (TPA), and tetrabutylammonium (TBA). TAA cations successfully protect zeolite Y framework during the dealumination process, resulting in increased Si/Al ratio with relatively preserved crystallinity. Among the TAA cations, the ability to protect zeolite Y framework during acid treatment decreases as the length of the alkyl chain increase from TMA to TPA cations. However, the trend could not be applied at TBA cation. This nonlinear correlation is attributed to the interplay between electronic and steric properties of the TAA cations.
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页数：9
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