ChemInform Abstract: Formation of Uniform Mesopores in ZSM‐5 Zeolite Through Treatment in Alkaline Solution.

Ogura, Masaru; Shinomiya, Shin‐ya; Tateno, Junko; Nara, Yasuto; Kikuchi, Eiichi; Matsukata, Masahiko

doi:10.1002/chin.200050227

Cited by 2 publications

(1 citation statement)

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“…; TEL: +886-2-33661662; FAX: +886-2-2363-6359; E-mail: chem1031@ntu.edu.tw desilication of zeolitic materials, [23][24][25][26] (iv) using carbon templating materials to incorporate mesopores during the synthesis of 40 zeolites, [27][28][29] and (v) assembly of mesoporous structures with zeolitic sheets. 30 In method (i), the synthesis procedures are tedious and the ordered mesoporous structure is often destroyed in hydrothermal treatment.…”

Section: Introductionmentioning

confidence: 99%

Cubic Pm3n mesoporous aluminosilicates assembled from zeolite seeds as strong acidic catalysts

Lin

Chen

Chang

et al. 2015

Catal. Sci. Technol.

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Cubic Pm3n mesoporous aluminosilicate isomorphous to SBA-1 with 3D-interconnected pore structures was assembled by Al-incorporated zeolite seeds at pH around 9 using cetyltriethylammonium bromide as pore-directing agent. The resultant materials (termed Al-ZSBA-1) owned the advantages of strong acidity from zeolitic structures and good diffusivity of bulky reactants from 3D-interconnected mesopores. Al-10 ZSBA-1 with Al loading up to a Al/Si molar ratio of 0.057 still retained the cubic Pm3n structure and high surface areas (ca. 600 m 2 /g). Their acidities were stronger than the counter materials prepared using sodium silicate as the silica source (referred as Al-SBA-1-alk). Moreover, all the Al(III) ions in Al-ZSBA-1 retained in tetrahedral coordination after calcination at 823 K, while a portion of Al(III) in Al-SBA-1-alk became octahedrally coordinated. In application to catalytic alkylation of 2,4-di-tert-15 butylphenol with cinnamyl alcohol, Al-ZSBA-1 gave higher flavan selectivities and yields, in comparison to Al-SBA-1-alk, ZSM-5, and beta zeolites. 45 (IZA code MWW) is the first identified zeolite formed by vertically aligning lamellar zeolite intermediate. 31 The as-made MCM-22 precursor (MCM-22(P)) is the stacking of zeolitic sheets through hydrogen bond and organic template with repeating unit d (001) of 2.5 nm. Several methods such as 50 calcination, delamination, swelling and pillaring have been applied to MCM-22(P) in order to generate micro/meso-porous structures namely MCM-56, MCM-36 and ITQ-2 in the past two decades. 32,33 However, the mesopores generated by pillaring or exfoliation of MCM-22(P) have wide distributed pore diameters. 55 Recently, Ryoo's group designed a series of gemini-type, polyquaternary ammonium surfactants which could generate micropores and mesopores simultaneously, and ordered mesoporous structures (lamellar or hexagonal) with thin zeolitic walls were synthesized based on the dual-templating concept. 30,34 60 The drawbacks are the tedious procedure and cost in synthesizing the specially designed surfactants.Among the mentioned methods, method (ii) using zeolite seeds as the building units of mesoporous framework has shown the advantage of facile control of the mesostructure through changing 65 different kinds of surfactants and hydrothermal conditions. The Graphical AbstractCubic Pm3n mesoporous aluminosilicate with 3D interconnected pore structure, assembled with Al-incorporated ZSM-5 seeds at pH 9 using CTEABr as pore-directing agent, was an efficient catalyst in alkylation of 2,4-di-tert-butylphenol with cinnamyl alcohol to form flavan.

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