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Molecules
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Porous and Nanoporous Materials in Heterogeneous Catalysis
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Porous and Nanoporous Materials in Heterogeneous Catalysis

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: 30 September 2024 | Viewed by 1325

Special Issue Editor

Dr. Angela Martins

E-Mail Website
Guest Editor
Department of Chemical Engineering, Instituto Superior de Engenharia de Lisboa, 1950-007 Lisboa, Portugal
Interests: heterogeneous catalysis; zeolites; hierarchical zeolites; bifunctional catalysts; carbon materials; porous silicas
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Porous and nanoporous materials have a wide range of applications in molecular separation, adsorption, and especially as heterogeneous catalysts or catalyst supports. A large set of porous materials such as zeolites and zeotypes, metal organic frameworks (MOFs), carbon materials, and mesoporous silicas have in common the presence of a large surface area and pore volume. The micropores inside such materials can act as microreactors, where the native active sites or introduced species, such as metals, promote the occurrence of catalytic reactions. On the other hand, larger pores or even the external surface of these materials can accommodate bulky species such as enzymes or organometallic catalysts, preventing leaching and transforming homogenous catalysts to environmentally friendly and reusable heterogeneous catalysts.

The aim of this Special Issue is to generate discussion concerning the synthesis and modification of porous and nanoporous materials, focusing on their applications as catalysts or catalyst supports for heterogeneous catalysis.

Dr. Angela Martins
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • porous and nanoporous materials
  • heterogeneous catalysts
  • hierarchical materials
  • bifunctional catalysts
  • catalyst supports
  • zeolites
  • zeotypes
  • carbon materials
  • MOFs
  • mesoporous silicas

Published Papers (2 papers)

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Research

16 pages, 3122 KiB  
Article
Thiophene-Based Covalent Triazine Frameworks as Visible-Light-Driven Heterogeneous Photocatalysts for the Oxidative Coupling of Amines
by Manuel Melero, Urbano Díaz and Francesc X. Llabrés i Xamena
Molecules 2024, 29(7), 1637; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules29071637 - 05 Apr 2024
Viewed by 530
Abstract
This study reports on a metal-free Covalent Triazine Framework (CTF) incorporating bithiophene structural units (TP-CTF) with a semicrystalline structure as an efficient heterogeneous photocatalyst under visible light irradiation. The physico-chemical properties and composition of this material was confirmed via different characterization solid-state techniques, [...] Read more.
This study reports on a metal-free Covalent Triazine Framework (CTF) incorporating bithiophene structural units (TP-CTF) with a semicrystalline structure as an efficient heterogeneous photocatalyst under visible light irradiation. The physico-chemical properties and composition of this material was confirmed via different characterization solid-state techniques, such as XRD, TGA, CO2 adsorption and FT-IR, NMR and UV-Vis spectroscopies. The compound was synthesized through a solvothermal process and was explored as a heterogeneous photocatalyst for the oxidative coupling of amines to imines under visible light irradiation. TP-CTF demonstrated outstanding photocatalytic activity, with high conversion rates and selectivity. Importantly, the material exhibited exceptional stability and recyclability, making it a strong candidate for sustainable and efficient imine synthesis. The low bandgap of TP-CTF enabled the efficient absorption of visible light, which is a notable advantage for visible-light-driven photocatalysis. Full article
(This article belongs to the Special Issue Porous and Nanoporous Materials in Heterogeneous Catalysis)
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15 pages, 2720 KiB  
Article
Hierarchical Zeolites Prepared Using a Surfactant-Mediated Strategy: ZSM-5 vs. Y as Catalysts for Friedel–Crafts Acylation Reaction
by Angela Martins, Beatriz Amaro, M. Soledade C. S. Santos, Nelson Nunes, Ruben Elvas-Leitão and Ana P. Carvalho
Molecules 2024, 29(2), 517; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules29020517 - 20 Jan 2024
Viewed by 634
Abstract
Hierarchical ZSM5 and Y zeolites were prepared through a surfactant-mediated strategy with NH4OH changing the duration of the treatment and the amount of CTAB surfactant and taking as reference multiples of the critical micellar concentration (CMC). The materials were characterized using [...] Read more.
Hierarchical ZSM5 and Y zeolites were prepared through a surfactant-mediated strategy with NH4OH changing the duration of the treatment and the amount of CTAB surfactant and taking as reference multiples of the critical micellar concentration (CMC). The materials were characterized using powder X-ray diffraction, N2 adsorption isotherms at −196 °C, and SEM and TEM microscopy. The catalytic performance was evaluated in Friedel–Crafts acylation of furan with acetic anhydride at 80 °C. The alkaline surfactant-mediated treatment had different effects on the two zeolites. For ZSM5, the CTAB molecular aggregates can hardly diffuse inside the medium-size pores, leading mainly to intercrystalline mesoporosity and increased external surface area, with no positive catalytic impact. On the other hand, for large-pore Y zeolite, the CTAB molecular aggregates can easily diffuse and promote the rearrangement of crystal units around micelles, causing the enlargement of the pores, i.e., intracrystalline porosity. The optimized Y-based sample, treated for 12 h with a CTAB amount 32 times the CMC, shows an increase in product yield and rate constant that was not observed when a higher amount of surfactant was added. The reuse of spent catalysts upon thermal treatment at 400 °C shows a regeneration efficiency around 90%, showing good potentialities for the modified catalysts. Full article
(This article belongs to the Special Issue Porous and Nanoporous Materials in Heterogeneous Catalysis)
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