Fabrication of hierarchical Lewis acid Sn-BEA with tunable hydrophobicity for cellulosic sugar isomerization

被引：34

作者：

Cho, Hong Je ^{[1
]}

Gould, Nicholas S. ^{[2
]}

Vattipalli, Vivek ^{[1
]}

Sabnis, Sanket ^{[1
]}

Chaikittisilp, Watcharop ^{[3
,4
]}

Okubo, Tatsuya ^{[3
]}

Xu, Bingjun ^{[2
]}

Fan, Wei ^{[1
]}

机构：

[1] Univ Massachusetts, Dept Chem Engn, Amherst, MA 01003 USA

[2] Univ Delaware, Dept Chem & Biomol Engn, Newark, DE 19716 USA

[3] Univ Tokyo, Dept Chem Syst Engn, Tokyo 1138656, Japan

[4] Natl Inst Mat Sci, Res & Serv Div Mat Data & Integrated Syst MaDIS, Tsukuba, Ibaraki 3050047, Japan

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2019年 / 278卷

关键词：

Lewis acid Sn-BEA; Hierarchical zeolites; Hydrophobicity; Recrystallization; Sugar isomerization; ZEOLITE SINGLE-CRYSTALS; GLUCOSE ISOMERIZATION; BETA ZEOLITES; LACTIC-ACID; HYDROTHERMAL SYNTHESIS; P-XYLENE; CATALYSTS; SITES; WATER; MFI;

D O I：

10.1016/j.micromeso.2018.12.046

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Lewis acid Sn-BEA catalysts with tunable morphology and hydrophobicity were successfully synthesized by the recrystallization of post-synthetic Sn-BEA in the presence of ammonium fluoride (NH4F) and tetraethylammonium bromide (TEABr). Three-dimensionally ordered mesoporous imprinted (3DOm-i) and nanocrystalline Sn-BEA catalysts with hydrophobic surface were synthesized for the first time by the method. This recrystallization method includes the dissolution of crystalline zeolite BEA by fluoride ions and the rearrangement of different types of silanol defects in the presence of TEABr. The method allows the final products to simultaneously inherit the morphology of their parent Al-BEA zeolites, and significantly reduce silanol defects within the catalysts. The Sn-BEA catalysts synthesized from the recrystallization method show largely enhanced catalytic performance for both glucose isomerization and bulky lactose isomerization in different solvents, which is presumably due to the hydrophobic surface and improved molecular transport property in the hierarchical zeolites. The recrystallization approach is a facile and reliable strategy to improve the hydrophobicity of zeolite catalysts with tunable morphologies ranging from nanocrystals to hierarchical structures.

引用

页码：387 / 396

页数：10

共 79 条

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