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We are grateful to Ministerio de Educacion y Ciencia'' (Spain, project CICYT CTQ2005-09078) for its financial support of this research.

Analysis of institutional authors

Serrano, DpCorresponding AuthorAguado, JAuthorEscola, JmAuthorPeral, AAuthor

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September 27, 2022
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Effect of the organic moiety nature on the synthesis of hierarchical ZSM-5 from silanized protozeolitic units

Publicated to:Journal Of Materials Chemistry a. 18 (35): 4210-4218 - 2008-01-01 18(35), DOI: 10.1039/b805502e

Authors: Serrano, D P; Aguado, J; Escola, J M; Rodriguez, J M; Peral, A

Affiliations

IMDEA Energia, Madrid 28933, Spain - Author
Rey Juan Carlos Univ, ESCET, Dept Chem & Environm Technol, Madrid 28933, Spain - Author

Abstract

The synthesis of hierarchical ZSM-5 from silanized protozeolitic units has been accomplished following a three step procedure comprising gel precrystallization at 90 degrees C, grafting of the seed silanization agent (SSA) and hydrothermal crystallization at 170 degrees C. The following four organosilanes were tested and investigated as SSAs: 3-aminopropyltrimethoxysilane (APTMS), isobutyltriethoxysilane (IBTES), phenylaminopropyltrimethoxysilane (PHAPTMS) and octadecyltrimethoxysilane (ODTMS). The last agent became anchored to the zeolite seeds to a rather reduced extent (1.3%) and the obtained material presented properties very similar to those of a reference nanocrystalline ZSM-5 (Sext similar to 100 m(2) g(-1), S(BET) similar to 450 m(2) g(-1), crystallite size 20-80 nm). In contrast, silanization of the protozeolitic units with APTMS or IBTES led to ZSM-5 samples having large surface areas (Sext similar to 200 m(2) g(-1), SBET similar to 500 m(2) g(-1)) and exhibiting mesopores (D(p) similar to 8 nm). These materials are formed by 300 -400 nm particles consisting of aggregates of ZSM-5 nanounits (10 -20 nm). Seed silanization with PHAPTMS caused the greatest enhancement in surface area (S(BET) 573 m(2) g(-1), S(ext) 225 m(2) g(-1)), the material so obtained being formed by the smallest nanounits (5 -10 nm) within the aggregates. Moreover, this sample presented a hierarchical porosity with pores around 2.0 -3.0 nm in addition to those generated by the MFI channels. The strong changes induced in the ZSM-5 crystal size and properties when using PHAPTMS as SSA have been attributed to this agent being very effective in both anchoring onto the protozeolitic units and perturbing the subsequent crystal growth step.

Keywords

Agricultural productsAl-mcm-41CatalystsColloidsGelationHydrothermal crystallizationHydrothermal synthesisMolecular-sievesNanocrystalline alloysOctadecyltrimethoxysilaneOrgano silanesSeedSeedsSilanesSilicaStable mesoporous aluminosilicatesSurfaceSynthesis ofZeolite single-crystalsZeolites

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Journal Of Materials Chemistry a due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2008, it was in position 15/189, thus managing to position itself as a Q1 (Primer Cuartil), in the category Materials Science, Multidisciplinary.

From a relative perspective, and based on the normalized impact indicator calculated from the Field Citation Ratio (FCR) of the Dimensions source, it yields a value of: 11.23, which indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: Dimensions Jul 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-07-08, the following number of citations:

  • WoS: 113
  • Scopus: 119

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-07-08:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 56.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 59 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 3.

Leadership analysis of institutional authors

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (Serrano Granados, David Pedro) and Last Author (Peral Yuste, Angel).

the author responsible for correspondence tasks has been Serrano Granados, David Pedro.