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6.3
3.9
Journals
Catalysts
Special Issues
Hierarchically Porous Catalysts
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Hierarchically Porous Catalysts

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

Deadline for manuscript submissions: 30 June 2024 | Viewed by 7921

Special Issue Editor

Dr. Zhao Wang

E-Mail Website
Guest Editor
1. Laboratory of Living Materials at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
2. Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Guangdong Laboratory, Xianhu Hydrogen Valley, Foshan 528200, China
Interests: porous hierarchy in materials; nanocatalyst synthesis; supported metal catalysts; heterogenous catalysis; energy conversion

Special Issue Information

Dear Colleagues,

Hierarchically porous catalysts that replicate the complex three-dimentional structures in living organisms have attracted intense attention from both the academic and industrial communities, as their special porous structure allows us to maximize the efficiency of each specific application.

Porous hierarchies enables the enhancement of catalytic performance beyond existing limits. In particular, hierarchically porous structures bring about significant improvents in the catalytic performce of zeolite by upgrading the effective diffusivity of guest moleculars and extending the utilization of active sites. Moreover, they enable the creation of uniformly dispersed active sites with particle sizes ranging from nanometers to single atoms at high metal loading values for supported metal catalysts owing to their large specific area. Additionally, special porus structures also allow the sequential harvesting of solar light for photocatalysis. Therefore, developing hierarchically porous catalysts has become a hot topic that will continue to produce useful results in years to come.

This Special Issue will focus on the use of hierarchically porous catalysts for various heterogeneous reactions. Particular importance will be placed on advanced synthesis methods, enhanced catalytic performances, and the clear identification of structure–function relationships.

We cordially invite you to submit a manuscript for consideration and possible publication in this Special Issue. We hope that this topic is of interest and look forward to hearing from you.

Dr. Zhao Wang
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. Catalysts 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 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

  • hierarchically porous stuctures
  • green synthesis
  • heterogeneous catalysis
  • zeolite
  • supported catalysts
  • photocatalysis

Published Papers (4 papers)

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Research

11 pages, 3502 KiB  
Article
Synthesis of Asymmetrical CsPbBr3/TiO2 Nanocrystals with Enhanced Stability and Photocatalytic Properties
by Wanli Liu, Jinfeng Liu, Xiaoqian Wang, Jiazhen He, Yuqing Li and Yong Liu
Catalysts 2023, 13(7), 1048; https://0-doi-org.brum.beds.ac.uk/10.3390/catal13071048 - 28 Jun 2023
Cited by 2 | Viewed by 1203
Abstract
Practical applications of CsPbX3 nanocrystals (NCs) are limited by their poor stability. The formation of a heterojunction between CsPbX3 NCs and oxides is an effective means to protect perovskite from polar solvents and other external factors. Significantly improving the stability and [...] Read more.
Practical applications of CsPbX3 nanocrystals (NCs) are limited by their poor stability. The formation of a heterojunction between CsPbX3 NCs and oxides is an effective means to protect perovskite from polar solvents and other external factors. Significantly improving the stability and photocatalytic properties of the core/shell perovskite is very important for its application in photoelectric and photocatalytic technology. Here, we report the synthesis of asymmetrical CsPbBr3/TiO2 core–shell heterostructure NCs at the single-particle level by hot-injection liquid-phase synthesis and sol–gel method, where each CsPbBr3 NCs is partially covered by titanium dioxide. We tested not only the optical properties of the material but also the electrochemical impedance and photocurrent density of the material in sodium sulfate solution. It is shown that the type II arrangement is generated at the heterogeneous interface, which greatly facilitates the separation of electron–hole pairs and increases the carrier transport efficiency. Compared with CsPbBr3 NCs, CsPbBr3/TiO2 has higher photocatalytic efficiency. More crucially, due to the protection of the titanium dioxide shell, the product has higher long-term stability in humid air compared with bare CsPbBr3 NCs. The asymmetrical core–shell heterostructure prepared in this study not only improves the stability of CsPbX3 NCs but also provides some ideas for optoelectronic device applications and TiO2-based photocatalysts. Full article
(This article belongs to the Special Issue Hierarchically Porous Catalysts)
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13 pages, 3083 KiB  
Article
Synthesis of All-Inorganic Halide Perovskite Nanocrystals for Potential Photoelectric Catalysis Applications
by Xiaoqian Wang, Wanli Liu, Jiazhen He, Yuqing Li and Yong Liu
Catalysts 2023, 13(7), 1041; https://0-doi-org.brum.beds.ac.uk/10.3390/catal13071041 - 27 Jun 2023
Cited by 1 | Viewed by 1495
Abstract
Compared with conventional semiconductors, halide perovskite nanocrystals (NCs) have a unique crystal structure and outstanding optoelectronic properties, offering wide potential for applications in optoelectronic devices such as solar cells, photodetectors, light-emitting diodes, lasers, and displays. Rational technological design is providing vital support for [...] Read more.
Compared with conventional semiconductors, halide perovskite nanocrystals (NCs) have a unique crystal structure and outstanding optoelectronic properties, offering wide potential for applications in optoelectronic devices such as solar cells, photodetectors, light-emitting diodes, lasers, and displays. Rational technological design is providing vital support for the development of perovskite optoelectronics. Herein, monodisperse all-inorganic halide perovskite nanocrystals with consistent morphology and cubic crystal phase were synthesized employing a modified one-pot hot injection method to independently modulate the stoichiometric ratios of three precursors involving cesium salt, lead source, and halide. In combination with an anion exchange reaction, mixing two kinds of perovskite NCs with different halogens enables a transition from violet emission to green and finally to red emission over the entire visible region. Additionally, optical and electrochemical tests suggested that the as-synthesized halide perovskite NCs are promising for photoelectric catalysis applications. Full article
(This article belongs to the Special Issue Hierarchically Porous Catalysts)
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11 pages, 1547 KiB  
Article
Interface Synergistic Effect from Hierarchically Porous Cu(OH)2@FCN MOF/CF Nanosheet Arrays Boosting Electrocatalytic Oxygen Evolution
by Xue Li, Yinan Zheng, Hu Yao, Jiayu Bai, Siliang Yue and Xiaohui Guo
Catalysts 2022, 12(6), 625; https://0-doi-org.brum.beds.ac.uk/10.3390/catal12060625 - 07 Jun 2022
Cited by 7 | Viewed by 2142
Abstract
The electrolysis of water is an efficient and environmentally friendly technology for large-scale hydrogen production. However, the oxygen evolution reaction (OER) involves a multi-electron–proton coupling transfer step that limits the efficiency of water splitting. Therefore, there is an urgent need to develop electrocatalysts [...] Read more.
The electrolysis of water is an efficient and environmentally friendly technology for large-scale hydrogen production. However, the oxygen evolution reaction (OER) involves a multi-electron–proton coupling transfer step that limits the efficiency of water splitting. Therefore, there is an urgent need to develop electrocatalysts with expected activity and stability to accelerate the kinetics of the oxygen evolution reaction. In this paper, hierarchically porous Cu(OH)2@(Fe, Co, Ni)MOF/CF nanosheet (denoted as Cu(OH)2@FCN MOF/CF) arrays were successfully prepared by the hydrothermally induced in situ growth of FCN MOF nanosheets using modified Cu(OH)2 nanowires as carriers; herein, the tuned active species of metal ligands in the FCN MOF composition structure are used as the main catalytic reaction size in the OER. The synergistic effect of a unique porous structure and the active metal-ligand species in the MOF render the catalyst a large electrochemically active surface area and more active species. Then, the active material is fully contacted with the electrolyte to expose more electrochemically active sites, thus greatly improving the electrocatalytic activity and durability of the OER. Specifically, the Cu(OH)2@FCN MOF/CF delivers a minimum overpotential of 290 mV and low Tafel slope of 96.15 mV·dec−1 at 10 mA·cm−2 as well as ultra-long cycling stability. The resulted OER performance is superior to most reported MOF-based electrocatalysts. This novel structural design not only provides a new strategy for the facile preparation of low-cost and high-efficiency OER electrocatalysts but also paves an avenue for the development of other MOF-based composite electrocatalysts with excellent electrocatalytic performances. Full article
(This article belongs to the Special Issue Hierarchically Porous Catalysts)
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17 pages, 3717 KiB  
Article
Highly Enhanced Catalytic Stability of Copper by the Synergistic Effect of Porous Hierarchy and Alloying for Selective Hydrogenation Reaction
by Hao Yuan, Zhao Wang, Shunjing Jin, Shanshan Xiao, Siming Liu, Zhiyi Hu, Lihua Chen and Baolian Su
Catalysts 2022, 12(1), 12; https://0-doi-org.brum.beds.ac.uk/10.3390/catal12010012 - 24 Dec 2021
Cited by 5 | Viewed by 2505
Abstract
Supported copper has a great potential for replacing the commercial palladium-based catalysts in the field of selective alkynes/alkadienes hydrogenation due to its excellent alkene selectivity and relatively high activity. However, fatally, it has a low catalytic stability owing to the rapid oligomerization of [...] Read more.
Supported copper has a great potential for replacing the commercial palladium-based catalysts in the field of selective alkynes/alkadienes hydrogenation due to its excellent alkene selectivity and relatively high activity. However, fatally, it has a low catalytic stability owing to the rapid oligomerization of alkenes on the copper surface. In this study, 2.5 wt% Cu catalysts with various Cu:Zn ratios and supported on hierarchically porous alumina (HA) were designed and synthesized by deposition–precipitation with urea. Macropores (with diameters of 1 μm) and mesopores (with diameters of 3.5 nm) were introduced by the hydrolysis of metal alkoxides. After in situ activation at 350 °C, the catalytic stability of Cu was highly enhanced, with a limited effect on the catalytic activity and alkene selectivity. The time needed for losing 10% butadiene conversion for Cu1Zn3/HA was ~40 h, which is 20 times higher than that found for Cu/HA (~2 h), and 160 times higher than that found for Cu/bulky alumina (0.25 h). It was found that this type of enhancement in catalytic stability was mainly due to the rapid mass transportation in hierarchically porous structure (i.e., four times higher than that in bulky commercial alumina) and the well-dispersed copper active site modified by Zn, with identification by STEM–HAADF coupled with EDX. This study offers a universal way to optimize the catalytic stability of selective hydrogenation reactions. Full article
(This article belongs to the Special Issue Hierarchically Porous Catalysts)
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