Special Issue "Synthesis and Application of Novel Nanocatalysts"

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Materials Processes".

Deadline for manuscript submissions: closed (31 October 2020).

Special Issue Editors

Prof. Dr. Kang Hyun Park
E-Mail Website
Guest Editor
Department of Chemistry, Pusan National University, Busan 46241, Korea
Interests: synthesis of new nanocatalysts & applications for organic reactions; fabrications & applications of nanomaterials; organometallic chemistry of f-and d-block transition metal complexes; new organometallic catalysts for efficient organic synthesis; transition-metal promoted organic synthesis and homogeneous catalysis
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Sungkyun Park
E-Mail Website
Guest Editor
Department of Physics, Pusan National University, Busan 46241, Korea
Interests: nanostructure and nanomaterial characterization; thin film/interface science (magnetism); neutron/X-ray scattering; thin film growth & characterization
Dr. Ji Chan Park
E-Mail Website
Guest Editor
Clean Fuel Laboratory, Korea Institute of Energy Research, Dajeon 305-343, Korea
Interests: heterogeneous materials; nano catalysts; fundamental study of synthesis and morphology control of nanomaterials

Special Issue Information

Dear Colleagues,

Recently, transition metal nanoparticles have been of considerable interest as catalysts in organic and inorganic transformations. Being small in size is expected to increase the nanoparticle surface tension. This makes surface atoms very active. In many cases, the inherent advantages of heterogeneous catalysts, such as the ease of product separation and catalyst recycling, are observed. However, the activity and selectivity of catalyst nanoparticles are strongly dependent on their size, shape, surface structure, and their bulk and surface composition. A large number of review articles provide extensive coverage of the subject. Moreover, the preparation, characterization, and mechanism of formation of transition metal nanoparticles have been extensively reviewed.

Homogeneous nanosized catalysts are already well known that exhibit better catalytic activity than heterogeneous catalysts because of easy solubility in reaction media and access to all catalytic sites. However, these homogeneous catalysts are rarely separated and recovered from the reaction systems efficiently by centrifugation methods and traditional filtration. For example, palladium nanoparticles have had problems in the reuse of catalysts and aggregation, thereby resulting in a decrease of catalytic activity. Catalysts in a distinct phase with respect to the reaction medium account for the major advantage of the heterogeneous catalysts over homogeneous catalysts, as it makes the separation and reutilization of heterogeneous catalysts simple and cheap compared to homogeneous catalysts. To overcome the drawback of these homogeneous catalysis problems, many efforts have been made to achieve the immobilization of a homogeneous nanocatalyst onto various insoluble support, activated carbon, polymer, alumina, porous silica materials with high surface area, zeolites, layered double hydroxides and magnetic nanoparticles. Recovering and recycling catalysts that are quite expensive result in positive effects from an economic and environmental point of view. The recognition of these limitations of homogeneous catalysts resulted in attempts to heterogenize homogeneous catalysts. However, a major drawback of heterogenized catalysts is the leaching of the catalyst during its use and recycling, leading to deactivation. A goal of catalyst research is to combine the advantages of both homogeneous (activity and selectivity) and heterogeneous catalytic systems (recycling catalyst), resulting in overcoming these problems.

All experimental works falling within the scope of this Special Issue, including original research papers, short communications, review articles, and perspective articles, are invited for submission.

This Special Issue on the “Synthesis and Application of Novel Nanocatalysts” aims to curate novel advances in the development and application of nanocatalysts to address longstanding challenges in heterogeneous catalysts. Topics include, but are not limited to:

  • Development of new nanocatalysts and applications for organic reactions;
  • Developments in hybrid metal nanocatalysts for organic reactions;
  • Development of heterogeneous catalysis;
  • Fabrications and applications of nanocatalysts.

Prof. Dr. Kang Hyun Park
Prof. Dr. Sungkyun Park
Dr. Ji Chan Park
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. Processes 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 2000 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

  • Nanocatalysts
  • Nanocomposites
  • Multicomponent
  • Heterogenous
  • Metal

Published Papers (5 papers)

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Research

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Article
Biomass-Derived Activated Carbon as a Catalyst for the Effective Degradation of Rhodamine B dye
Processes 2020, 8(8), 926; https://0-doi-org.brum.beds.ac.uk/10.3390/pr8080926 - 02 Aug 2020
Cited by 4 | Viewed by 1383
Abstract
Activated carbon (AC) was fabricated from carrot waste using ZnCl2 as the activating agent and calcined at 700 °C for 2 h in a tube furnace. The as-synthesized AC was characterized using Fourier-transform infrared spectroscopy, X-ray diffraction analysis, scanning electron microscopy, transmission [...] Read more.
Activated carbon (AC) was fabricated from carrot waste using ZnCl2 as the activating agent and calcined at 700 °C for 2 h in a tube furnace. The as-synthesized AC was characterized using Fourier-transform infrared spectroscopy, X-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and Brunauer–Emmett–Teller analysis; the results revealed that it exhibited a high specific surface area and high porosity. Moreover, this material displayed superior catalytic activity for the degradation of toxic Rhodamine B (RhB) dye. Rate constant for the degradation of RhB was ascertained at different experimental conditions. Lastly, we used the Arrhenius equation and determined that the activation energy for the decomposition of RhB using AC was approximately 35.9 kJ mol−1, which was very low. Hopefully it will create a great platform for the degradation of other toxic dye in near future. Full article
(This article belongs to the Special Issue Synthesis and Application of Novel Nanocatalysts)
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Article
Hierarchical Cs–Pollucite Nanozeolite Modified with Novel Organosilane as an Excellent Solid Base Catalyst for Claisen–Schmidt Condensation of Benzaldehyde and Acetophenone
Processes 2020, 8(1), 96; https://0-doi-org.brum.beds.ac.uk/10.3390/pr8010096 - 10 Jan 2020
Cited by 2 | Viewed by 1382
Abstract
Cs–pollucite can be a potential solid base catalyst due to the presence of (Si-O-Al)Cs+ basic sites. However, it severely suffers from molecular diffusion and pore accessibility problems due to its small micropore opening. Herein, we report the use of new [...] Read more.
Cs–pollucite can be a potential solid base catalyst due to the presence of (Si-O-Al)Cs+ basic sites. However, it severely suffers from molecular diffusion and pore accessibility problems due to its small micropore opening. Herein, we report the use of new organosilane, viz. dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride (TPOAC), as a promising pore-expanding agent to develop the hierarchical structure in nanosized Cs–pollucite. In respect to this, four different amounts of TPOAC were added during the synthesis of hierarchical Cs–pollucite (CP-x, x = 0, 0.3, 1.0, or 2.0, where x is the molar ratio of TPOAC) in order to investigate the effects of TPOAC in the crystallization process of Cs–pollucite. The results show that an addition of TPOAC altered the physico-chemical and morphological properties of hierarchical Cs–pollucite, such as the crystallinity, crystallite size, pore size distribution, surface areas, pore volume, and surface basicity. The prepared solids were also tested in Claisen–Schmidt condensation of benzaldehyde and acetophenone, where 82.2% of the conversion and 100% selectivity to chalcone were achieved by the CP-2.0 catalyst using non-microwave instant heating (200 °C, 100 min). The hierarchical CP-2.0 nanocatalyst also showed better catalytic performance than other homogenous and heterogeneous catalysts and displayed a high catalyst reusability with no significant deterioration in the catalytic performance even after five consecutive reaction runs. Full article
(This article belongs to the Special Issue Synthesis and Application of Novel Nanocatalysts)
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Article
Preparation and Performance Analysis of Graphite Additive/Paraffin Composite Phase Change Materials
Processes 2019, 7(7), 447; https://0-doi-org.brum.beds.ac.uk/10.3390/pr7070447 - 13 Jul 2019
Cited by 15 | Viewed by 2185
Abstract
In the thermal energy storage system, the thermal properties of phase change materials (PCM) have a great influence on the system performance. In this paper, paraffin-based composite phase change material with different graphite additive (expanded graphite, EG; graphene, GR; and graphene oxide, GO) [...] Read more.
In the thermal energy storage system, the thermal properties of phase change materials (PCM) have a great influence on the system performance. In this paper, paraffin-based composite phase change material with different graphite additive (expanded graphite, EG; graphene, GR; and graphene oxide, GO) and different concentrations (0.5 to 2.0%) are manufactured by a two-step method combining mechanical agitation and ultrasonic vibration. The characteristics of charge/discharge processes are studied, and the thermophysical properties are measured by T-history method. The experimental results show that the thermal conductivity and heat charge rate of the composite PCM are effectively improved by adding the graphite additive to the PCM, and the addition of additives can improve the melting point of the material. When the same graphite additive is added, the higher the concentration, the higher the thermal conductivity of the composite PCM, and the latent heat decreases with the increase of concentration. When adding the same amount of carbon additives, the graphene/paraffin composite PCM has the highest heat charge/discharge rate and thermal conductivity. It is finally concluded that graphene is the most promising candidate for heat transfer enhancement of paraffin among three carbon additives even though the EG-based composite PCM gives relatively high latent heat. Full article
(This article belongs to the Special Issue Synthesis and Application of Novel Nanocatalysts)
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Article
High-Performance Chlorine-Doped Cu2O Catalysts for the Ethynylation of Formaldehyde
Processes 2019, 7(4), 198; https://0-doi-org.brum.beds.ac.uk/10.3390/pr7040198 - 06 Apr 2019
Cited by 1 | Viewed by 1537
Abstract
The in situ formed Cu+ species serve as active sites in the ethynylation of formaldehyde. The key problem that needs to be solved in this process is how to avoid excessive reduction of Cu2+ to inactive metallic Cu, which tends to [...] Read more.
The in situ formed Cu+ species serve as active sites in the ethynylation of formaldehyde. The key problem that needs to be solved in this process is how to avoid excessive reduction of Cu2+ to inactive metallic Cu, which tends to decrease the catalytic activity. In this work, Cl-modified Cu2O catalysts with different Cl content were prepared by co-precipitation. The characterization results demonstrated that Cl remained in the lattice structure of Cu2O, inducing the expansion of the Cu2O lattice and the enhancement of the Cu–O bond strength. Consequently, the reduction of Cu+ to Cu0 was effectively prevented in reductive media. Moreover, the activity and stability of Cu2O were significantly improved. The Cl modification increased the yield of 1,4-butynediol (BD) from 73% to 94% at a reaction temperature of 90 °C. More importantly, the BD yield of Cl modified Cu2O was still as high as 86% during the ten-cycle experiment, whereas the BD yield of Cu2O in the absence of Cl decreased sharply to 17% at the same reaction conditions. This work provides a simple strategy to stabilize Cu+ in reductive media. Full article
(This article belongs to the Special Issue Synthesis and Application of Novel Nanocatalysts)
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Review

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Review
Recent Novel Hybrid Pd–Fe3O4 Nanoparticles as Catalysts for Various C–C Coupling Reactions
Processes 2019, 7(7), 422; https://0-doi-org.brum.beds.ac.uk/10.3390/pr7070422 - 03 Jul 2019
Cited by 10 | Viewed by 1709
Abstract
The use of nanostructure materials as heterogeneous catalysts in the synthesis of organic compounds have been receiving more attention in the rapid developing area of nanotechnology. In this review, we mainly focused on our own work on the synthesis of hybrid palladium–iron oxide [...] Read more.
The use of nanostructure materials as heterogeneous catalysts in the synthesis of organic compounds have been receiving more attention in the rapid developing area of nanotechnology. In this review, we mainly focused on our own work on the synthesis of hybrid palladium–iron oxide nanoparticles. We discuss the synthesis of Pd–Fe3O4—both morphology-controlled synthesis of Pd–Fe3O4 and transition metal-loaded Pd–Fe3O4—as well as its application in various C–C coupling reactions. In the case of rose-like Pd–Fe3O4 hybrid nanoparticles, thermal decomposition can be used instead of oxidants or reductants, and morphology can be easily controlled. We have developed a method for the synthesis of nanoparticles that is facile and eco-friendly. The catalyst was recyclable for up to five continual cycles without significant loss of catalytic activity and may provide a great platform as a catalyst for other organic reactions in the near future. Full article
(This article belongs to the Special Issue Synthesis and Application of Novel Nanocatalysts)
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