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Analysis of institutional authors

Martínez-Ortigosa, JAuthor

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October 28, 2024
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Crystalline phase transition in as-synthesized pure silica zeolite RTH containing tetra-alkyl phosphonium as organic structure directing agent

Publicated to: Journal Of Materials Chemistry a. 12 (2): 876-891 - 2024-01-03 12(2), DOI: 10.1039/d3ta06071c

Authors:

Martinez-Ortigosa, J; Millán, R; Simancas, J; Hernández-Rodríguez, M; Vidal-Moya, JA; Jordá, JL; Martineau-Corcos, C; Sarou-Kanian, V; Boronat, M; Blasco, T; Rey, F
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Affiliations

CNRS, CEMHTI, UPR3079, 1D Ave Rech Sci - Author
Univ Alicante, Dept Quim Inorgan, Lab Nanotecnol Mol - Author
Univ Jaume 1, Inst Mat Avanzados, Castellon de La Plana - Author
Univ Politecn Valencia, CSIC, Inst Tecnol Quim, Avda Naranjos S-N - Author
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Abstract

The choice of structure directing agents (SDAs) in zeolite synthesis significantly impacts the arrangement of active sites, thereby influencing the stabilization of reaction intermediates with profound implications for catalytic applications. Therefore, understanding the distribution of SDAs along with the substitution of heteroatoms for silicon in zeolites is imperative for tailoring optimized materials for specific applications. This study is centered on the synthesis of all-silica RTH type zeolites in the presence of fluoride, utilizing triisopropyl(methyl)phosphonium as the organic SDA (OSDA). Zeolites produced under varying conditions of time and temperature exhibit differences in their X-ray diffractograms, indicating the presence of two distinct crystalline phases. The 19F NMR spectra confirm the presence of fluoride within the small rth cage and exhibit two distinct signals depending on the sample. The 29Si NMR spectra reveal the existence of penta-coordinated F-SiO4 species, resulting in sixteen non-equivalent Si sites. Through ab initio DFT methods, the stabilization energy and 29Si chemical shielding of several models featuring F-SiO4 situated at all crystallographic sites were computed. Comparison with experimental results enabled the identification of the framework position where the five-coordinate silicon is located, which differs between the two crystalline phases of the as-synthesized RTH zeolites. Consequently, the placement of fluoride in either of these two sites within the RTH zeolite can be controlled during the synthesis. It is expected that this methodology can be extended to manipulate the position of trivalent atoms (e.g., Al3+ or B3+), which can affect the catalytic properties of the RTH zeolite. Two distinct RTH phases are formed through the bonding of fluoride to different silicon sites and this is controlled by adjusting the synthesis conditions.
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Keywords

5-coordinate siliconActive siteAll-silicaCrystalline phase transitionCrystalline phasisDensityExtra-large-poreFluoride anionsFluorine compoundsFrameworkGeneralized gradient approximationLocationMolecular-sievesNmr spectrumNuclear magnetic resonance spectroscopyOrganic structuresPure silica zeolitesReaction intermediatesRth zeolitesSilicaSiliconSolid-state nmrStabilizationStructure directing agentsSynthesisedZeolite synthesisZeolites

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, 2024 there are still no calculated indicators, but in 2023, it was in position 63/460, thus managing to position itself as a Q1 (Primer Cuartil), in the category Materials Science, Multidisciplinary.

Independientemente del impacto esperado determinado por el canal de difusión, es importante destacar el impacto real observado de la propia aportación.

Según las diferentes agencias de indexación, el número de citas acumuladas por esta publicación hasta la fecha 2025-12-28:

  • WoS: 5
  • Scopus: 4
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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 2025-12-28:

  • 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: 10 (PlumX).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.
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Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: France.

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 (Martinez Ortigosa, Joaquín) and Last Author (Rey, F).

the authors responsible for correspondence tasks have been Blasco, T and Rey, F.

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