Catalytic Applications of Metal or Metal Oxide Nanocomposites

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

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 7484

Special Issue Editors

King Abdullah Institute for Nanotechnology, King Saud University, Riyadh 11451, Saudi Arabia
Interests: nanomaterials; metal/metal oxide; organocatalysts; CO2 utilization; photocatalysts; thermoresponsive polymers; porous materials; porous organic polymers

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Guest Editor
King Abdullah Institute for Nanotechnology, King Saud University, Riyadh 11451, Saudi Arabia
Interests: multi-functional nanomaterials; synthesis; catalysts; oxidative dehydrogenation; characterizations; CO2 hydrogenation

Special Issue Information

Dear Colleagues,

The study of catalysis is an ever-growing filed of science due to the fact that 35% of the world’s GDP is influenced by catalysis, which focuses on the transformation of one precursor to a more important product. The various catalysts studied are biocatalysts (enzymes, microbes), organo-catalysts or transition metal catalysts for various applications in the area medicinal chemistry, textile industry, food, and beverages industry and for energy production. Among the various catalysts, heterogeneous catalysis has gained more prominence due to the fact that it is easily separable, because of which, expensive catalysts can be recovered in a straightforward manner. Additionally, it enables faster, large-scale production and selective product formation. Interestingly, the industrial production of 90% of chemicals (by volume) is assisted by solid heterogeneous catalysts.

The effective use of heterogeneous catalysts witnessed an enhanced efficiency when conventional heterogeneous catalysts were replaced with nanostructured material of the same element, because of the exponential increase in surface area due to the formation of nanoparticles/nanocomposites, which plays a vital role in the interaction of the substrate and the active sites of the catalyst, which in turn leads to the enhanced performance of the catalysts.

Hence, in this Special Issue, we seek original articles/reviews on the preparation and characterization of supported/unsupported metal/metal oxide nanocomposites, and emphasis will be given to the catalytic application of metal/metal oxide nanocomposites. Catalytic applications including but not limited to oxidation, transesterification, hydrogenation, hydrodesulphurization, oxidative dehydrogenation, CO2 hydrogenation, CO2 utilization, environmental remediation, photocatalytic degradation, and fuel cells shall be considered for publication in this issue.

On behalf of the Special Issue Co-Editors and myself, we warmly invite the catalyst community to submit their original work or an up-to-date review to this Special Issue, which will provide our readership with a comprehensive overview of many the topics covered by our discipline.

Dr. Aslam Khan
Dr. Syed Farooq Adil
Dr. Ahmed Mohamed El-Toni
Guest Editors

Manuscript Submission Information

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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

  • Metal nanoparticles
  • Metal oxides
  • Characterizations
  • Nanocomposites
  • Catalytic support
  • Nanostructured materials
  • Porous materials
  • CO2 utilization
  • CO2 hydrogenation
  • Perovskites
  • Heterogeneous catalysis
  • Homogeneous catalysis
  • Environmental remediation
  • Photocatalytic degradation

Published Papers (3 papers)

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Research

14 pages, 22730 KiB  
Article
Synthesis of 14-Substituted-14H-Dibenzo[a,j]Xanthene Derivatives in Presence of Effective Synergetic Catalytic System Bleaching Earth Clay and PEG-600
by Sandeep T. Atkore, Giribala M. Bondle, Pranita V. Raithak, Vinod T. Kamble, Ravi Varala, Mufsir Kuniyil, Mohammad Rafe Hatshan, Baji Shaik, Syed Farooq Adil and Mohammed Althaf Hussain
Catalysts 2021, 11(11), 1294; https://0-doi-org.brum.beds.ac.uk/10.3390/catal11111294 - 27 Oct 2021
Cited by 3 | Viewed by 1792
Abstract
The synthesis of 14-aryl 14H-dibenzo[a,j]xanthenes is achieved by a simple condensation reaction between β-naphthol with aryl or alkyl aldehydes in an effective synergetic catalytic system created by combining basic bleaching earth clay and PEG-600. The advantages of the present method include [...] Read more.
The synthesis of 14-aryl 14H-dibenzo[a,j]xanthenes is achieved by a simple condensation reaction between β-naphthol with aryl or alkyl aldehydes in an effective synergetic catalytic system created by combining basic bleaching earth clay and PEG-600. The advantages of the present method include catalyst recyclability, superior product yield, a shorter reaction time and the avoidance of hazardous reagents. Synthesized xanthene derivatives were also screened for their antibacterial activity against Staphylococcus aureus (MTCC 96) and Pseudomonas aeruginosa (Wild). Full article
(This article belongs to the Special Issue Catalytic Applications of Metal or Metal Oxide Nanocomposites)
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23 pages, 14799 KiB  
Article
Solventless Mechanochemical Fabrication of ZnO–MnCO3/N-Doped Graphene Nanocomposite: Efficacious and Recoverable Catalyst for Selective Aerobic Dehydrogenation of Alcohols under Alkali-Free Conditions
by Mujeeb Khan, Syed Farooq Adil, Mohamed E. Assal, Abdulrahman I. Alharthi, Mohammed Rafi Shaik, Mufsir Kuniyil, Abdulrahman Al-Warthan, Aslam Khan, Zeeshan Nawaz, Hamid Shaikh and Mohammed Rafiq H. Siddiqui
Catalysts 2021, 11(7), 760; https://0-doi-org.brum.beds.ac.uk/10.3390/catal11070760 - 23 Jun 2021
Cited by 6 | Viewed by 2146
Abstract
Catalytic efficacy of metal-based catalysts can be significantly enhanced by doping graphene or its derivatives in the catalytic protocol. In continuation of previous work regarding the catalytic properties of highly-reduced graphene oxide (HRG), graphene-oxide (GO) doped mixed metal oxide-based nanocomposites, herein we report [...] Read more.
Catalytic efficacy of metal-based catalysts can be significantly enhanced by doping graphene or its derivatives in the catalytic protocol. In continuation of previous work regarding the catalytic properties of highly-reduced graphene oxide (HRG), graphene-oxide (GO) doped mixed metal oxide-based nanocomposites, herein we report a simple, straightforward and solventless mechanochemical preparation of N-doped graphene (NDG)/mixed metal oxide-based nanocomposites of ZnO–MnCO3 (i.e., ZnO–MnCO3/(X%-NDG)), wherein N-doped graphene (NDG) is employed as a dopant. The nanocomposites were prepared by physical milling of separately fabricated NDG and ZnO–MnCO3 calcined at 300 °C through eco-friendly ball mill procedure. The as-obtained samples were characterized via X-ray diffraction (XRD), Thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FT-IR), Raman, Field emission scanning electron microscopy (FESEM), Energy-dispersive X-ray spectroscopy (EDX) and surface area analysis techniques. To explore the effectiveness of the obtained materials, liquid-phase dehydrogenation of benzyl alcohol (BOH) to benzaldehyde (BH) was chosen as a benchmark reaction using eco-friendly oxidant (O2) without adding any harmful surfactants or additives. During the systematic investigation of reaction, it was revealed that the ZnO–MnCO3/NDG catalyst exhibited very distinct specific-activity (80 mmol/h.g) with a 100% BOH conversion and <99% selectivity towards BH in a very short time. The mechanochemically synthesized NDG-based nanocomposite showed remarkable enhancement in the catalytic performance and increased surface area compared with the catalyst without graphene (i.e., ZnO–MnCO3). Under the optimum catalytic conditions, the catalyst successfully transformed various aromatic, heterocyclic, allylic, primary, secondary and aliphatic alcohols to their respective ketones and aldehydes with high selectively and convertibility without over-oxidation to acids. In addition, the ZnO–MnCO3/NDG was also recycled up to six times with no apparent loss in its efficacy. Full article
(This article belongs to the Special Issue Catalytic Applications of Metal or Metal Oxide Nanocomposites)
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16 pages, 6180 KiB  
Article
Mesoporous Organo-Silica Supported Chromium Oxide Catalyst for Oxidative Dehydrogenation of Ethane to Ethylene with CO2
by Abdulrhman S. Al-Awadi, Ahmed Mohamed El-Toni, Joselito P. Labis, Aslam Khan, Hamid Ghaithan, Attiyah A. Al-Zahrani, Ahmed E. Abasaeed and Saeed M. Al-Zahrani
Catalysts 2021, 11(5), 642; https://0-doi-org.brum.beds.ac.uk/10.3390/catal11050642 - 18 May 2021
Cited by 6 | Viewed by 2406
Abstract
Chromium oxide supported on mesoporous organo-silica (MOS) was synthesized with different Cr loading by an incipient method. The catalytic performance of a Cr(x)/MOS catalyst for CO2-based ethane dehydrogenation was investigated. The synthesized catalysts were characterized by XRD, BET, TEM, SEM, XPS, [...] Read more.
Chromium oxide supported on mesoporous organo-silica (MOS) was synthesized with different Cr loading by an incipient method. The catalytic performance of a Cr(x)/MOS catalyst for CO2-based ethane dehydrogenation was investigated. The synthesized catalysts were characterized by XRD, BET, TEM, SEM, XPS, FTIR, and UV–Vis DR measurements. The textural properties of the prepared samples showed that the mesoporous nature of MOS sample was not disturbed by chromium impregnation. Among the prepared samples, Cr(8)/MOS catalyst exhibited good distribution of chromium species along with superior concentration of Cr6+ and the highest recorded Cr6+/Cr3+ ratio. The results revealed that the superior catalytic performance was reached at Cr(8)/MOS, with 50.4% and 90.1% of ethane conversion and ethylene selectivity, respectively. The catalytic activity decreased slowly over reaction time; it declined approximately 22% after 10 h of stream operation. The roles of CO2-based ethane dehydrogenation were also studied, where carbon dioxide can be a source of lattice oxygen and as a hydrogen consumer in reverse water–gas shift (RWGS) reaction. The effect of various catalytic factors, such as catalytic temperature, reaction time, space gas velocity, and CO2 partial pressure on the conversion of ethane, yield, and selectivity to ethylene, were investigated as well. Full article
(This article belongs to the Special Issue Catalytic Applications of Metal or Metal Oxide Nanocomposites)
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