Fundamentals and Catalytic Applications of Oxide-Based Materials

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "C:Chemistry".

Deadline for manuscript submissions: 31 July 2024 | Viewed by 1461

Special Issue Editor


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Guest Editor
Chemical Engineering in the Department of Chemistry and Life Science, United States Military Academy, West Point, NY 10996, USA
Interests: surface science; computational catalysis; materials chemistry; oxides

Special Issue Information

Dear Colleagues,

Metal oxide catalysts have shown a remarkable performance towards a wide range of acid–base, hydrotreating, and oxidation reactions in many refining and petrochemical processes. Thus, understanding the catalytic activity at micro- and nanoscale is essential for designing effective oxide-based catalysts. The physical properties of catalytically active oxide materials, such as size, surface area, shape, or porosity, directly affect the performance of resulting catalysts towards different reactions. Furthermore, the use of adequate supports, including zeolites, MOFs, carbon, silica, and alumina, is necessary to disperse oxide particles and activate the substrate, thereby improving the thermal and electrical conductivity of catalysts. Overall, considerable efforts have been invested in searching for cost-effective and multifunctional oxide catalysts to replace conventional noble metal catalysts. Accordingly, this Special Issue seeks to showcase research papers, communications, and review articles that focus on the novel design, development, and modelling of oxide-based catalysts at micro- and nanoscale towards industrially relevant reactions, including CO oxidation, hydrogenation of hydrocarbon, and hydrogen/oxygen evolution.

Dr. Simuck F. Yuk
Guest Editor

Manuscript Submission Information

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Keywords

  • oxide
  • material science
  • catalysis
  • micro- and nanostructures

Published Papers (1 paper)

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Research

10 pages, 1209 KiB  
Article
Micromotors of MnO2 for the Recovery of Microplastics
by Oscar Cervantes, Claudia Valtierra-Montiel, Laura Sampedro-Plata, Norberto Casillas, Nieves Menendez and Pilar Herrasti
Micromachines 2024, 15(1), 141; https://doi.org/10.3390/mi15010141 - 17 Jan 2024
Viewed by 1007
Abstract
Plastics, primarily microplastics, are among the greatest pollutants in aquatic environments. Their removal and/or degradation in these environments are crucial to ensure an optimal future of these ecosystems. In this work, MnO2 particles were synthesized and characterized for the removal of polystyrene [...] Read more.
Plastics, primarily microplastics, are among the greatest pollutants in aquatic environments. Their removal and/or degradation in these environments are crucial to ensure an optimal future of these ecosystems. In this work, MnO2 particles were synthesized and characterized for the removal of polystyrene microplastics as a model. MnO2 catalyzes the peroxide reaction, resulting in the formation of oxygen bubbles that propel the pollutants to the surface, achieving removal efficiencies of up to 80%. To achieve this, hydrothermal synthesis was employed using various methods. Parameters such as MnO2, pH, microplastics, and H2O2 concentrations were varied to determine the optimal conditions for microplastics recovering. The ideal conditions for a low microplastic concentrations (10 mg L−1) are 0.2 g L−1 MnO2, 1.6% of H2O2 and 0.01 triton as a surfactant. In these conditions, the micromotors can recover approximately 80% of 300 nm sized polystyrene microplastic within 40 min. Full article
(This article belongs to the Special Issue Fundamentals and Catalytic Applications of Oxide-Based Materials)
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