Special Issue "Synthesis and Application of Zeolite Catalysts"

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Catalytic Materials".

Deadline for manuscript submissions: 31 August 2019

Special Issue Editors

Guest Editor
Dr. Kyungsu Na

Department of Chemistry, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, South Korea
Website | E-Mail
Interests: heterogeneous catalysis; nanostructured materials; C1 conversion
Guest Editor
Dr. Chang Hyun Ko

School of Chemical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, South Korea
E-Mail
Interests: the heterogeneous catalysis using various nanostructured materials

Special Issue Information

Dear Colleagues,

Zeolites are central in many industrial and chemical engineering processes involving solid catalysts, which have attracted a great deal of attention from chemists, chemical engineers, and materials scientists. This family of nanoporous crystals was first discovered in 1756 and, since then, about 40 zeolites structures have been found in nature, and about 160 structures, to date, have been synthesized artificially in the lab. The regularly-arranged micropores within stable crystalline architectures afford useful functions to zeolite catalysts, such as size/shape selective catalytic ability and high thermal/hydrothermal/mechanical stabilities. In this regard, a great deal of research regarding the synthesis of zeolites, with better functions, as well as their catalytic applications, has been performed so far, and broad knowledge has been accumulated over the decades. For example, in addition to the aluminosilicate-type classical zeolites, various transition metal-incorporated zeolites have been synthesized, which is reminiscent of the heterogenized version of transition metal complexes. The tiny micropores often limit their catalytic regime to only sufficiently-small molecular species that can go through the pore aperture, but such a limited applicability has also been considerably improved by the generation of larger pores in a mesopore range.

The aforementioned research works on the development of various synthetic zeolites, having better catalytic performances, has guided current industrial society to a brighter and greener world. The aim of the present Special Issue is to report the latest research advances in the synthesis and characterization of zeolites and their catalytic applications in experimental and theoretical manners. Broad contributions, including other crystalline nanoporous materials and their catalytic applications, would also be valuable subjects to widen the scope of this Special Issue.

Dr. Kyungsu Na
Dr. Chang Hyun Ko
Guest Editors

Manuscript Submission Information

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Keywords

  • Zeolite synthesis
  • Mesoporous zeolite
  • Hierarchical zeolite
  • Heterogeneous catalyst
  • Catalytic application

Published Papers (6 papers)

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Research

Open AccessArticle Dehydration of Bioethanol to Ethylene over H-ZSM-5 Catalysts: A Scale-Up Study
Catalysts 2019, 9(2), 186; https://doi.org/10.3390/catal9020186 (registering DOI)
Received: 21 January 2019 / Revised: 8 February 2019 / Accepted: 14 February 2019 / Published: 16 February 2019
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Abstract
Bioethanol dehydration was carried out in a bench scale reactor-loaded H-ZSM-5 molded catalyst, which increased by tens of times more than at lab scale (up to 60 and 24 times based on the amount of catalyst and ethanol flow rate, respectively). From the [...] Read more.
Bioethanol dehydration was carried out in a bench scale reactor-loaded H-ZSM-5 molded catalyst, which increased by tens of times more than at lab scale (up to 60 and 24 times based on the amount of catalyst and ethanol flow rate, respectively). From the results of the lab scale reaction, we confirmed the optimum Si/Al ratio (14) of H-ZSM-5, reaction temperature (~250 °C), and weight hourly space velocity (WHSV) (<5 h−1) indicating high ethanol conversion and ethylene selectivity. Five types of cylindrical shaped molded catalysts were prepared by changing the type and/or amount of organic solid binder, inorganic solid binder, inorganic liquid binder, and H-ZSM-5 basis catalyst. Among them, the catalyst exhibiting the highest compression strength and good ethanol dehydration performance was selected. The bench scale reaction with varying reaction temperature of 245–260 °C and 1.2– 2.0 h−1 WHSV according to reaction time showed that the conversion and ethylene selectivity were more than 90% after 400 h on stream. It was also confirmed that even after the successive catalyst regeneration and the reaction for another 400 h, both the ethanol conversion and ethylene selectivity were still maintained at about 90%. Full article
(This article belongs to the Special Issue Synthesis and Application of Zeolite Catalysts)
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Open AccessArticle Dehydrogenation of Propane to Propylene Using Promoter-Free Hierarchical Pt/Silicalite-1 Nanosheets
Catalysts 2019, 9(2), 174; https://doi.org/10.3390/catal9020174
Received: 14 January 2019 / Revised: 3 February 2019 / Accepted: 5 February 2019 / Published: 13 February 2019
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Abstract
Propane dehydrogenation (PDH) is the extensive pathway to produce propylene, which is as a very important chemical building block for the chemical industry. Various catalysts have been developed to increase the propylene yield over recent decades; however, an active site of monometallic Pt [...] Read more.
Propane dehydrogenation (PDH) is the extensive pathway to produce propylene, which is as a very important chemical building block for the chemical industry. Various catalysts have been developed to increase the propylene yield over recent decades; however, an active site of monometallic Pt nanoparticles prevents them from achieving this, due to the interferences of side-reactions. In this context, we describe the use of promoter-free hierarchical Pt/silicalite-1 nanosheets in the PDH application. The Pt dispersion on weakly acidic supports can be improved due to an increase in the metal-support interaction of ultra-small metal nanoparticles and silanol defect sites of hierarchical structures. This behavior leads to highly selective propylene production, with more than 95% of propylene selectivity, due to the complete suppression of the side catalytic cracking. Moreover, the oligomerization as a side reaction is prevented in the presence of hierarchical structures due to the shortening of the diffusion path length. Full article
(This article belongs to the Special Issue Synthesis and Application of Zeolite Catalysts)
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Open AccessArticle Phase Controlled Synthesis of Pt Doped Co Nanoparticle Composites Using a Metal-Organic Framework for Fischer–Tropsch Catalysis
Catalysts 2019, 9(2), 156; https://doi.org/10.3390/catal9020156
Received: 15 January 2019 / Revised: 29 January 2019 / Accepted: 30 January 2019 / Published: 5 February 2019
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Abstract
Recently, metal nanoparticles embedded in porous carbon composite materials have been playing a significant role in a variety of fields as catalyst supports, sensors, absorbents, and in energy storage. Porous carbon composite materials can be prepared using various synthetic methods; recent efforts provide [...] Read more.
Recently, metal nanoparticles embedded in porous carbon composite materials have been playing a significant role in a variety of fields as catalyst supports, sensors, absorbents, and in energy storage. Porous carbon composite materials can be prepared using various synthetic methods; recent efforts provide a facile way to prepare the composites from metal-organic frameworks (MOFs) by pyrolysis. However, it is usually difficult to control the phase of metal or metal oxides during the synthetic process. Among many types of MOF, recently, cobalt-based MOFs have attracted attention due to their unique catalytic and magnetic properties. Herein, we report the synthesis of a Pt doped cobalt based MOF, which is subsequently converted into cobalt nanoparticle-embedded porous carbon composites ([email protected]/C) via pyrolysis. Interestingly, the phase of the cobalt metal nanoparticles (face centered cubic (FCC) or hexagonal closest packing (HCP)) can be controlled by tuning the synthetic conditions, including the temperature, duration time, and dosage of the reducing agent (NaBH4). The Pt doped Co/C was characterized using various techniques including PXRD (powder X-ray diffraction), XPS (X-ray photoelectron spectroscopy), gas sorption analysis, TEM (transmission electron microscopy), and SEM (scanning electron microscopy). The composite was applied as a phase transfer catalyst (PTC). The Fischer-Tropsch catalytic activity of the [email protected]/C (10:1:2.4) composite shows 35% CO conversion under a very low pressure of syngas (1 MPa). This is one of the best reported conversion rates at low pressure. The 35% CO conversion leads to the generation of various hydrocarbons (C1, C2–C4, C5, and waxes). This catalyst may also prove useful for energy and environmental applications. Full article
(This article belongs to the Special Issue Synthesis and Application of Zeolite Catalysts)
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Open AccessArticle Fabrication of the Hierarchical HZSM-5 Membrane with Tunable Mesoporosity for Catalytic Cracking of n-Dodecane
Catalysts 2019, 9(2), 155; https://doi.org/10.3390/catal9020155
Received: 18 January 2019 / Revised: 30 January 2019 / Accepted: 1 February 2019 / Published: 5 February 2019
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Abstract
Hierarchical HZSM-5 membranes were prepared on the inner wall of stainless steel tubes, using amphiphilic organosilane (TPOAC) and mesitylene (TMB) as a meso-porogen and a swelling agent, respectively. The mesoporosity of the HZSM-5 membranes were tailored via formulating the TPOAC/Tetraethylorthosilicate (TPOAC/TEOS) ratio and [...] Read more.
Hierarchical HZSM-5 membranes were prepared on the inner wall of stainless steel tubes, using amphiphilic organosilane (TPOAC) and mesitylene (TMB) as a meso-porogen and a swelling agent, respectively. The mesoporosity of the HZSM-5 membranes were tailored via formulating the TPOAC/Tetraethylorthosilicate (TPOAC/TEOS) ratio and TMB/TPOAC ratio, in synthesis gel, and the prepared membranes were systematically characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), N2 adsorption–desorption, N2 permeation, inductively coupled plasma (ICP), in situ fourier transform infrared (FT-IR), ammonia temperature-programmed desorption (NH3-TPD), etc. It was found that the increase of the TPOAC/TEOS ratio promoted a specific surface area and diffusivity of the HZSM-5 membranes, as well as decreased acidity; the increase of the TMB/TPOAC ratios led to an enlargement of the mesopore size and diffusivity of the membranes, but with constant acid properties. The catalytic performance of the prepared HZSM-5 membranes was tested using the catalytic cracking of supercritical n-dodecane (500 °C, 4 MPa) as a model reaction. The hierarchical membrane with the TPOAC/TEOS ratio of 0.1 and TMB/TPOAC ratio of 2, exhibited superior catalytic performances with the highest activity of up to 13% improvement and the lowest deactivation rate (nearly a half), compared with the microporous HZSM-5 membrane, due to the benefits of suitable acidity, together with enhanced diffusivity of n-dodecane and cracking products. Full article
(This article belongs to the Special Issue Synthesis and Application of Zeolite Catalysts)
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Open AccessArticle A Hybrid Reactor System Comprised of Non-Thermal Plasma and Mn/Natural Zeolite for the Removal of Acetaldehyde from Food Waste
Catalysts 2018, 8(9), 389; https://doi.org/10.3390/catal8090389
Received: 3 August 2018 / Revised: 30 August 2018 / Accepted: 8 September 2018 / Published: 10 September 2018
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Abstract
The degradation of low concentrations of acetaldehyde while using a non-thermal plasma (NTP)/catalyst hybrid reactor system was investigated while using humidified air at ambient temperature. A series of highly active manganese-impregnated natural zeolite (Mn/NZ) catalysts were synthesized by the incipient wetness method using [...] Read more.
The degradation of low concentrations of acetaldehyde while using a non-thermal plasma (NTP)/catalyst hybrid reactor system was investigated while using humidified air at ambient temperature. A series of highly active manganese-impregnated natural zeolite (Mn/NZ) catalysts were synthesized by the incipient wetness method using sonication. The Mn/NZ catalysts were analyzed by Brunauer-Emmett-Teller surface area measurements and X-ray photoelectron spectroscopy. The Mn/NZ catalyst located at the downstream of a dc corona was used for the decomposition of ozone and acetaldehyde. The decomposition efficiency of ozone and acetaldehyde was increased significantly using the Mn/NZ catalyst with NTP. Among the various types of Mn/NZ catalysts with different Mn contents, the 10 wt.% Mn/NZ catalyst under the NTP resulted the highest ozone and acetaldehyde removal efficiency, almost 100% within 5 min. Moreover, this high efficiency was maintained for 15 h. The main reason for the high catalytic activity and stability was attributed to the high dispersion of Mn on the NZ made by the appropriate impregnation method using sonication. This system is expected to be efficient to decompose a wide range of volatile organic compounds with low concentrations. Full article
(This article belongs to the Special Issue Synthesis and Application of Zeolite Catalysts)
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Open AccessArticle Catalytic Copyrolysis of Cork Oak and Waste Plastic Films over HBeta
Catalysts 2018, 8(8), 318; https://doi.org/10.3390/catal8080318
Received: 13 July 2018 / Revised: 30 July 2018 / Accepted: 1 August 2018 / Published: 3 August 2018
Cited by 1 | PDF Full-text (2026 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
The catalytic fast copyrolysis (CFCP) of cork oak (CoOak) and waste plastic films (WPFs) over HBeta(25) (SiO2/Al2O3: 25) was investigated using a thermogravimetric (TG) analyzer and a tandem micro reactor-gas chromatography/mass spectrometry (TMR-GC/MS) to determine the effectiveness [...] Read more.
The catalytic fast copyrolysis (CFCP) of cork oak (CoOak) and waste plastic films (WPFs) over HBeta(25) (SiO2/Al2O3: 25) was investigated using a thermogravimetric (TG) analyzer and a tandem micro reactor-gas chromatography/mass spectrometry (TMR-GC/MS) to determine the effectiveness of WPFs as the hydrogen donating cofeeding feedstock on the CFCP of biomass. By applying CFCP, the maximum decomposition temperatures of CoOak (373.4 °C) and WPFs (487.9 °C) were reduced to 364.5 °C for CoOak and 436.5 °C for WPFs due to the effective interaction between the pyrolysis intermediates of CoOak and WPFs over HBeta(25), which has strong acidity and an appropriate pore size. The experimental yields of aromatic hydrocarbons on the CFCP of CoOak and WPFs were higher than their calculated yields concluded from the yields obtained from the individual catalytic fast pyrolysis (CFP) of CoOak and WPFs. The coke amount produced from the CFP of CoOak and WPFs over HBeta(25) were also decreased by applying CFCP. Full article
(This article belongs to the Special Issue Synthesis and Application of Zeolite Catalysts)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Advances in the green synthesis of hierarchical zeolites
Abstract: Zeolite crystals with unique pore structure, adjustable acidity, high surface area and high hydrothermal stability have been widely used in petrochemicals and fine chemical industries. Hierarchical zeolites have been extensively studied due to their promoting diffusion capability leading to great improvance in activity and coking-deactivation resistance . However, traditional synthesis strategy for hierarchical zeolties is characteristic of high energy consumption, high discharge and high pollution with numerous waste water and organic templates. In recent 10 years, a series of green synthesis routes of hierarchical zeolites have been developed by improving traditional synthesis methods or adopting new synthesis methods. In this review, latest advances on the green synthesis of hierarchical zeolite is summarized and discussed in detail. The problems and future direction of the green synthesis are also proposed.
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