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Advances in Heterogeneous Catalysis
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Advances in Heterogeneous Catalysis

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

Deadline for manuscript submissions: closed (31 October 2022) | Viewed by 7299

Special Issue Editor

Dr. Qingwen Song

E-Mail Website
Guest Editor
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, China
Interests: green chemistry; C1 (MeOH, CO2, CH4) chemical conversion; fine chemicals synthesis; heterogeneous catalysis; flow chemistry; industrial catalysis

Special Issue Information

Dear Colleagues,

The study of heterogeneous catalysis would greatly promote the development of industrial chemistry. The goal of this Special Issue is to provide the frontiers of academic research on heterogeneous catalysis with regard to synthesis, catalytic methods, reaction mechanisms and technology under thermal-, electro-, or photoassisted processes, among others. Catalysts focusing on a broad research area include, but are not limited to, organic polymers, single atom catalysts, metal-supported catalysts, nanomaterials, MOF, and COF. In addition, the field involves synthetic chemistry, energy chemistry, green chemistry, environmental chemistry, material chemistry, and theoretical chemistry. 

Dr. Qingwen Song
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

  • heterogeneous catalysis
  • sustainable chemistry
  • energy chemistry
  • catalytic methods
  • catalytic reaction mechanism
  • thermal synthesis
  • electro- or photo-assisted catalytic synthesis
  • flow chemistry
  • green chemistry

Published Papers (4 papers)

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Research

11 pages, 1957 KiB  
Article
Controllable Deposition of Bi onto Pd for Selective Hydrogenation of Acetylene
by Hongquan Kang, Jianzhou Wu, Baohui Lou, Yue Wang, Yilin Zhao, Juanjuan Liu, Shihui Zou and Jie Fan
Molecules 2023, 28(5), 2335; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules28052335 - 03 Mar 2023
Viewed by 1443
Abstract
The rational regulation of catalyst active sites at atomic scale is a key approach to unveil the relationship between structure and catalytic performance. Herein, we reported a strategy for the controllable deposition of Bi on Pd nanocubes (Pd NCs) in the priority order [...] Read more.
The rational regulation of catalyst active sites at atomic scale is a key approach to unveil the relationship between structure and catalytic performance. Herein, we reported a strategy for the controllable deposition of Bi on Pd nanocubes (Pd NCs) in the priority order from corners to edges and then to facets (Pd NCs@Bi). The spherical aberration-corrected scanning transmission electron microscopy (ac-STEM) results indicated that Bi2O3 with an amorphous structure covers the specific sites of Pd NCs. When only the corners and edges of the Pd NCs were covered, the supported Pd NCs@Bi catalyst exhibited an optimal trade-off between high conversion and selectivity in the hydrogenation of acetylene to ethylene under ethylene-rich conditions (99.7% C2H2 conversion and 94.3% C2H4 selectivity at 170 °C) with remarkable long-term stability. According to the H2-TPR and C2H4-TPD measurements, the moderate hydrogen dissociation and the weak ethylene adsorption are responsible for this excellent catalytic performance. Following these results, the selectively Bi-deposited Pd nanoparticle catalysts showed incredible acetylene hydrogenation performance, which provides a feasible perspective to design and develop highly selective hydrogenation catalysts for industrial applications. Full article
(This article belongs to the Special Issue Advances in Heterogeneous Catalysis)
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17 pages, 9492 KiB  
Article
Screening of Palladium/Charcoal Catalysts for Hydrogenation of Diene Carboxylates with Isolated-Rings (Hetero)aliphatic Scaffold
by Vladyslav V. Subotin, Bohdan V. Vashchenko, Vitalii M. Asaula, Eduard V. Verner, Mykyta O. Ivanytsya, Oleksiy Shvets, Eugeniy N. Ostapchuk, Oleksandr O. Grygorenko, Sergey V. Ryabukhin, Dmitriy M. Volochnyuk and Sergey V. Kolotilov
Molecules 2023, 28(3), 1201; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules28031201 - 26 Jan 2023
Cited by 4 | Viewed by 1868
Abstract
A series of seven palladium-containing composites, i.e., four Pd/C and three Pd(OH)2/C (Pearlman’s catalysts), was prepared using modified common approaches to deposition of Pd or hydrated PdO on charcoal. All the composites were tested in the catalytic hydrogenation of diene carboxylates [...] Read more.
A series of seven palladium-containing composites, i.e., four Pd/C and three Pd(OH)2/C (Pearlman’s catalysts), was prepared using modified common approaches to deposition of Pd or hydrated PdO on charcoal. All the composites were tested in the catalytic hydrogenation of diene carboxylates with the isolated-ring scaffold, e.g., 5,6-dihydropyridine-1(2H)-carboxylates with 2-(alkoxycarbonyl)cyclopent-1-en-1-yl and hex-1-en-1-yl substituents at the C(4)-position. The performance of the composites was also studied via the hydrogenation of quinoline as a model reaction. The composites were characterized by transmission and scanning electron microscopy (TEM and SEM), powder X-ray diffraction, and low-temperature N2 adsorption. It was found that the composites containing Pd nanoparticles (NPs) of 5–40 nm size were the most efficient catalysts for the hydrogenation of dienes, providing the reduced products with up to 90% yields at p(H2) = 100 atm, T = 30 °C for 24 h. The method of Pd NPs formation had more effect on the catalyst performance than the size of the NPs. The catalytic performance of Pearlman’s catalysts (Pd(OH)2/C) in the hydrogenation of dienes was comparable to or lower than the performance of the Pd/C systems, though the Pearlman’s catalysts were more efficient in the hydrogenation of quinoline. Full article
(This article belongs to the Special Issue Advances in Heterogeneous Catalysis)
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10 pages, 507 KiB  
Article
Synthesis of Novel Cavitand Host Molecules via Palladium-Catalyzed Aryloxy- and Azidocarbonylation
by Akash, László Kollár and Tímea R. Kégl
Molecules 2022, 27(23), 8404; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules27238404 - 01 Dec 2022
Viewed by 1291
Abstract
Novel, elongated, resorcine[4]arene-based cavitands were synthesized via various consecutive reaction steps, including homogeneous catalytic aryloxy- and azidocarbonylation processes. The effects of carbon monoxide pressure and temperature on the conversion were examined in aryloxycarbonylation. It was revealed that a reaction temperature of 100 °C [...] Read more.
Novel, elongated, resorcine[4]arene-based cavitands were synthesized via various consecutive reaction steps, including homogeneous catalytic aryloxy- and azidocarbonylation processes. The effects of carbon monoxide pressure and temperature on the conversion were examined in aryloxycarbonylation. It was revealed that a reaction temperature of 100 °C is required to achieve complete conversion both with monodentate (PPh3) and bidentate (Xantphos) phosphines at different carbon monoxide pressures (1–40 bar). Using ten different phenols as O-nucleophiles, partial hydrolysis of the esters to the corresponding carboxylic acids took place—i.e., 58–90% chemoselectivities toward esters were obtained. Moreover, the influences of temperature, reaction time and the catalyst ratio on the selectivity and conversion were described in the case of azidocarbonylation reaction. The formation of the acyl azide with high chemoselevtivity can be achieved at room temperature only. The higher reaction temperatures (50 °C) and higher catalyst loadings favor the formation of the primary amide. The characterization of the target compounds (esters and acyl azides) was carried out by IR and 1H and 13C NMR. The discussion of the influences of various parameters is based on in situ NMR investigations. Full article
(This article belongs to the Special Issue Advances in Heterogeneous Catalysis)
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18 pages, 3332 KiB  
Article
New MgFeAl-LDH Catalysts for Claisen–Schmidt Condensation
by Rodica Zăvoianu, Mădălina Tudorache, Vasile I. Parvulescu, Bogdan Cojocaru and Octavian D. Pavel
Molecules 2022, 27(23), 8391; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules27238391 - 01 Dec 2022
Cited by 1 | Viewed by 2055
Abstract
A rapid, cheap and feasible new approach was used to synthesize the Mg0.375Fe0.375Al0.25-LDH in the presence of tetramethylammonium hydroxide (TMAH), as a nontraditional hydrolysis agent, applying both mechano-chemical (MC) and co-precipitation methods (CP). For comparison, these catalysts [...] Read more.
A rapid, cheap and feasible new approach was used to synthesize the Mg0.375Fe0.375Al0.25-LDH in the presence of tetramethylammonium hydroxide (TMAH), as a nontraditional hydrolysis agent, applying both mechano-chemical (MC) and co-precipitation methods (CP). For comparison, these catalysts were also synthesized using traditional inorganic alkalis. The mechano-chemical method brings several advantages since the number of steps and the energy involved are smaller than in the co-precipitation method, while the use of organic alkalis eliminates the possibility of contaminating the final solid with alkaline cations. The memory effect was also investigated. XRD studies showed Fe3O4 as stable phase in all solids. Regardless of the alkalis and synthesis methods used, the basicity of catalysts followed the trend: mixed oxides > parent LDH > hydrated LDH. The catalytic activity of the catalysts in the Claisen–Schmidt condensation between benzaldehyde and cyclohexanone showed a linear dependence to the basicity values. After 2 h, the calcined sample cLDH-CO32−/OH−-CP provided a conversion value of 93% with a total selectivity toward 2,6-dibenzylidenecyclohexanone. The presence of these catalysts in the reaction media inhibited the oxidation of benzaldehyde to benzoic acid. Meanwhile, for the self-condensation of cyclohexanone, the conversions to mono- and di-condensed compounds did not exceed 3.8%. Full article
(This article belongs to the Special Issue Advances in Heterogeneous Catalysis)
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