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Special Issue "Zeolites and Related Nanoporous Materials: Synthesis, Characterization and Applications in Catalysis and Green Chemistry"

A special issue of Molecules (ISSN 1420-3049).

Deadline for manuscript submissions: closed (31 October 2017)

Special Issue Editors

Guest Editor
Prof. Dr. Roger Gläser

Institute of Chemical Technology, Universität Leipzig, Linnéstr. 3, 04103 Leipzig, Germany
Website | E-Mail
Interests: heterogeneous catalysis; materials with defined and hierarchically structured porosity; supported metal (oxide) catalysts; diffusion and catalysis; diesel off-gas treatment; C1-chemistry; energy conversion and storage; photocatalysis; alternative solvent systems
Assistant Guest Editor
Dr. Nicole Wilde

Institute of Chemical Technology, Universität Leipzig, Linnéstr. 3, 04103 Leipzig, Germany
Website | E-Mail
Interests: heterogeneous catalysis; utilization of renewables; micro-/mesoporous zeolites; hierarchically structured materials; textural characterization; aqueous-phase processing

Special Issue Information

Dear Colleagues,

In recent years, the class of zeolites, molecular sieves and related nanoporous materials, has been greatly expanded. These materials are of particular interest, both in industry and in academia, due to their large variety of properties and, thus, the areas of their applications, spanning from adsorption and separation to heterogeneous catalysis, and, nowadays, also in green chemistry, are growing continuously. Considerable progress in this dynamic field of research has been made, notably, in the synthesis and characterization of novel materials. With an emphasis on understanding the interplay of physico-chemical properties, such as structure, composition, texture, and morphology, with their function and behavior in sorption and catalysis, perspectives for new applications can be based on a rational material design.

In view of this, this Special Issue is aimed at featuring the most recent progress in research and development on the synthesis, characterization, and applications of zeolites and related nanoporous materials in the fields of catalysis and green chemistry. Submissions are welcome across the following themes, but are not limited to this list:

  • Materials and their preparation
    • zeolites and related microporous materials (AlPOs, SAPOS), metal-organic frameworks, covalent organic frameworks and related organic coordination polymers,
    • micro-/meso-/macroporous and hierarchically structured materials, layered materials, ordered mesoporous materials,
    • novel synthesis strategies (sol-gel, solvothermal/ionothermal synthesis, solvent-free synthesis, dry gel synthesis, clear gels), novel structure-directing agents, bio-based templates, template-free synthesis.
  • Characterization of materials and modes of operation
    • characterization of nanoporous materials with respect to structure, composition, porosity, and morphology, including spectroscopic and diffraction methods,
    • understanding modes of operation by in-situ/operando spectroscopy, application-oriented characterization, modelling and simulation approaches.
  • Applications in catalysis and green chemistry
    • catalysis in refining and petrochemistry including light olefins production and heavy-feedstocks upgrading,
    • utilization of greenhouse gases (CO2 and CH4) including reduction of CO2, reforming, and aromatzation and (partial) oxidation of methane,
    • energy conversion (generation and conversion of hydrogen, photocatalysis),
    • valorization of biomass and biomass-derived feedstocks,
    • environmental aplications including off-gas (automotive) and waste water treatment,
    • fine chemical synthesis via novel routes based on zeolites and related catalysts.

We encourage you to submit full papers, short communications, and reviews to this Special Issue highlighting the challenges and opportunities in the field of zeolites and related nanoporous materials.

Prof. Dr. Roger Gläser
Dr. Nicole Wilde
Guest Editors

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 papers will be 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 monthly 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 1800 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

  • zeolites
  • metal-organic frameworks
  • organic coordination polymers
  • ordered mesoporous materials
  • hierarchically structured materials
  • synthesis
  • bio-based templates
  • spectroscopic and textural characterization including in-situ and operando methods
  • refining and petrochemistry
  • utilization of bio-based resources
  • CO2 and CH4 utilization
  • green chemistry
  • energy conversion
  • environmental protection
  • fine chemicals synthesis

Published Papers (4 papers)

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Research

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Open AccessArticle Effect of Steam Deactivation Severity of ZSM-5 Additives on LPG Olefins Production in the FCC Process
Molecules 2017, 22(10), 1784; doi:10.3390/molecules22101784
Received: 11 October 2017 / Revised: 18 October 2017 / Accepted: 18 October 2017 / Published: 21 October 2017
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Abstract
ZSM-5-containing catalytic additives are widely used in oil refineries to boost light olefin production and improve gasoline octanes in the Fluid Catalytic Cracking (FCC) process. Under the hydrothermal conditions present in the FCC regenerator (typically >700 °C and >8% steam), FCC catalysts and
[...] Read more.
ZSM-5-containing catalytic additives are widely used in oil refineries to boost light olefin production and improve gasoline octanes in the Fluid Catalytic Cracking (FCC) process. Under the hydrothermal conditions present in the FCC regenerator (typically >700 °C and >8% steam), FCC catalysts and additives are subject to deactivation. Zeolites (e.g., Rare Earth USY in the base catalyst and ZSM-5 in Olefins boosting additives) are prone to dealumination and partial structural collapse, thereby losing activity, micropore surface area, and undergoing changes in selectivity. Fresh catalyst and additives are added at appropriate respective levels to the FCC unit on a daily basis to maintain overall targeted steady-state (equilibrated) activity and selectivity. To mimic this process under accelerated laboratory conditions, a commercial P/ZSM-5 additive was hydrothermally equilibrated via a steaming process at two temperatures: 788 °C and 815 °C to simulate moderate and more severe equilibration industrial conditions, respectively. n-Dodecane was used as probe molecule and feed for micro-activity cracking testing at 560 °C to determine the activity and product selectivity of fresh and equilibrated P-doped ZSM-5 additives. The fresh/calcined P/ZSM-5 additive was very active in C12 cracking while steaming limited its activity, i.e., at catalyst-to-feed (C/F) ratio of 1, about 70% and 30% conversion was obtained with the fresh and steamed additives, respectively. A greater activity drop was observed upon increasing the hydrothermal deactivation severity due to gradual decrease of total acidity and microporosity of the additives. However, this change in severity did not result in any selectivity changes for the LPG (liquefied petroleum gas) olefins as the nature (Brønsted-to-Lewis ratio) of the acid/active sites was not significantly altered upon steaming. Steam deactivation of ZSM-5 had also no significant effect on aromatics formation which was enhanced at higher conversion levels. Coke remained low with both fresh and steam-deactivated P/ZSM-5 additives. Full article
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Review

Jump to: Research

Open AccessReview Probing Gas Adsorption in Zeolites by Variable-Temperature IR Spectroscopy: An Overview of Current Research
Molecules 2017, 22(9), 1557; doi:10.3390/molecules22091557
Received: 5 July 2017 / Revised: 6 September 2017 / Accepted: 11 September 2017 / Published: 15 September 2017
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Abstract
The current state of the art in the application of variable-temperature IR (VTIR) spectroscopy to the study of (i) adsorption sites in zeolites, including dual cation sites; (ii) the structure of adsorption complexes and (iii) gas-solid interaction energy is reviewed. The main focus
[...] Read more.
The current state of the art in the application of variable-temperature IR (VTIR) spectroscopy to the study of (i) adsorption sites in zeolites, including dual cation sites; (ii) the structure of adsorption complexes and (iii) gas-solid interaction energy is reviewed. The main focus is placed on the potential use of zeolites for gas separation, purification and transport, but possible extension to the field of heterogeneous catalysis is also envisaged. A critical comparison with classical IR spectroscopy and adsorption calorimetry shows that the main merits of VTIR spectroscopy are (i) its ability to provide simultaneously the spectroscopic signature of the adsorption complex and the standard enthalpy change involved in the adsorption process; and (ii) the enhanced potential of VTIR to be site specific in favorable cases. Full article
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Open AccessReview An Introduction to Zeolite Synthesis Using Imidazolium-Based Cations as Organic Structure-Directing Agents
Molecules 2017, 22(8), 1307; doi:10.3390/molecules22081307
Received: 15 June 2017 / Revised: 1 August 2017 / Accepted: 4 August 2017 / Published: 6 August 2017
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Abstract
Zeolite synthesis is a wide area of study with increasing popularity. Several general reviews have already been published, but they did not summarize the study of imidazolium species in zeolite synthesis. Imidazolium derivatives are promising compounds in the search for new zeolites and
[...] Read more.
Zeolite synthesis is a wide area of study with increasing popularity. Several general reviews have already been published, but they did not summarize the study of imidazolium species in zeolite synthesis. Imidazolium derivatives are promising compounds in the search for new zeolites and can be used to help understand the structure-directing role. Nearly 50 different imidazolium cations have already been used, resulting in a variety of zeolitic types, but there are still many derivatives to be studied. In this context, the purpose of this short review is to help researchers starting in this area by summarizing the most important concepts related to imidazolium-based zeolite studies and by presenting a table of recent imidazolium derivatives that have been recently studied to facilitate filling in the knowledge gaps. Full article
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Open AccessReview Synthesis and Modification of Clinoptilolite
Molecules 2017, 22(7), 1107; doi:10.3390/molecules22071107
Received: 10 May 2017 / Accepted: 26 June 2017 / Published: 4 July 2017
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Abstract
Clinoptilolite is a natural mineral with exceptional physical characteristics resulting from its special crystal structure, mainstreamed into a large zeolite group called heulandites. An overall view of the research related to the synthesis, modification and application of synthetic clinoptilolite is presented. A single
[...] Read more.
Clinoptilolite is a natural mineral with exceptional physical characteristics resulting from its special crystal structure, mainstreamed into a large zeolite group called heulandites. An overall view of the research related to the synthesis, modification and application of synthetic clinoptilolite is presented. A single phase of clinoptilolite can be hydrothermally synthesized for 1–10 days in an autoclave from various silica, alumina, and alkali sources with initial Si/Al ratio from 3.0 to 5.0 at a temperature range from 120 to 195 °C. Crystallization rate and crystallinity of clinoptilolite can be improved by seeding. The modification of clinoptilolite has received noticeable attention from the research community, since modified forms have specific properties and therefore their area of application has been broadening. This paper provides a review of the use of organic compounds such as quarter alkyl ammonium, polymer, amine and inorganic species used in the modification process, discusses the processes and mechanisms of clinoptilolite modification, and identifies research gaps and new perspectives. Full article
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