NDLI: Designing ordered mesoporous aluminosilicates under acidic conditions <i>via</i> an intrinsic hydrolysis method

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Inside back cover

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Dalton Transactions Vol - 46 Issue - 2

Dalton Transactions Vol -39

Dalton Transactions Vol -0

Designing ordered mesoporous aluminosilicates under acidic conditions via an intrinsic hydrolysis method

Content Provider	Royal Society of Chemistry (RSC)
Author	Selvam, Parasuraman Krishna, Nunna V.
Copyright Year	2017
Abstract	Acid-mediated synthesis of ordered mesoporous aluminosilicates (OMAS) with medium-to-strong Brønsted acid sites and trivalent aluminium exclusively in a tetrahedral framework structure is realized by a newly devised intrinsic hydrolysis method. In this way, we have synthesized a series of well-ordered OMAS, e.g., H-AlSBA-15 and H-AlIITM-56, which are otherwise difficult to distinguish under acidic conditions owing to very different hydrolysis rates of both silicon and aluminium sources used for preparation as well as easy dissociation of thus formed Al–O–Si bonds. This novel intrinsic hydrolysis approach, however, relies mainly on similar hydrolysis rates of constituent inorganic species leading to efficient condensation. Thus, the innovative methodology using tetraethyl orthosilicate and aluminium citrate, respectively, as tetravalent silicon and trivalent aluminium as precursors facilitates the formation of high quality OMAS with a narrow pore size distribution, thicker walls, and trivalent aluminium in a tetrahedral framework structure with a high aluminium content, as evidenced by a battery of characterization techniques, viz., XRD, XRF, SEM, TEM and BET. The resulting materials, in turn, generate Brønsted acid sites in the aluminosilicate matrix, with the absence of the usually encountered Lewis acid sites, viz., extra-framework and/or non-framework species, as confirmed by both 27Al MAS-NMR and NH3-TPD studies. All the prepared catalysts exhibit excellent activity towards the tertiary butylation of phenol, and the high activity of the catalysts is attributed to the unique and exclusive presence of medium-to-strong acid sites in the OMAS matrix.
Starting Page	770
Ending Page	779
Page Count	10
File Format	HTM / HTML PDF
ISSN	14779226
Volume Number	46
Issue Number	3
Journal	Dalton Transactions
DOI	10.1039/c6dt02964g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	OMAS XRF SEM BET Lewis Mesoporous material Acid Aluminium Hydrolysis Dissociative Tetraethyl orthosilicate Citric acid Tetravalence X-ray crystallography X-ray fluorescence Transmission electron microscopy Aluminosilicate Extracellular matrix Ammonia Phenol
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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