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Molecules
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Novel Nanocatalysts for Gaseous-Pollutants Purification
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Novel Nanocatalysts for Gaseous-Pollutants Purification

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

Deadline for manuscript submissions: closed (31 March 2025) | Viewed by 703

Special Issue Editor

Dr. Fengyu Gao

E-Mail Website
Guest Editor
Department of Environmental Engineering, University of Science and Technology Beijing, Beijing, China
Interests: catalysis; environmental catalysis; energy catalysis
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Gaseous pollutants from industrial sources, motor vehicles and domestic sources constantly cause atmospheric pollution and ecological environment damage. Environmental catalysis technology and nanocatalytic materials play an important role in the process of pollutant purification. This Special Issue focuses primarily on novel nanocatalysts with unique physicochemical properties and excellent environmental purification performances in the treatment of gaseous pollutants (including, but not limited to, carbon oxides, sulfur, nitrogen, and halogens); we also encourage the submission of research results in the fields of the collaborative treatment of various pollutants, pollution reduction, and carbon reduction.

This Special Issue primarily focuses on the synthesis, optimization, and mechanism of novel nanocatalysts (which includes but is not limited to, precious metals, metal/alloys, metal oxides, non-metallic materials, etc.) and their application in removing gaseous-pollutants by using the primary production methods of thermal-catalysis, photo-catalysis, electro-catalysis, plasma catalysis and combined technologies, and so on. We welcome original articles, systematic reviews, short communications, and other types of articles on related topics. All manuscripts will follow standard journal peer-review practices, and those accepted for publication will appear in this Special Issue, titled “Novel Nanocatalysts for Gaseous-Pollutants Purification”. We look forward to receiving your contributions.

Dr. Fengyu Gao
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

  • novel nanocatalysts
  • gaseous pollutants
  • precious metals
  • metal/alloys
  • metal oxides
  • non-metallic materials
  • environmental catalysis technology

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Published Papers (1 paper)

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Research

28 pages, 5412 KiB  
Article
CoCeOx-PVP Catalyst for Effective CO-SCR in the Presence of O2
by Yuansong Zhou, Fengyu Gao, Lei Yi, Junyi Wang, Honghong Yi and Xiaolong Tang
Molecules 2025, 30(5), 1133; https://doi.org/10.3390/molecules30051133 - 1 Mar 2025
Viewed by 479
Abstract
In an O2-containing environment, achieving efficient selective catalytic reduction of nitrogen oxides (NOx) by carbon monoxide (CO) using non-noble metal catalysts remains a formidable challenge. To balance the catalytic oxidation of CO and the catalytic reduction of NOx, we need to [...] Read more.
In an O2-containing environment, achieving efficient selective catalytic reduction of nitrogen oxides (NOx) by carbon monoxide (CO) using non-noble metal catalysts remains a formidable challenge. To balance the catalytic oxidation of CO and the catalytic reduction of NOx, we need to develop a catalyst with strong reductibility and weak oxidizability for the CO selective catalytic reduction of NOx (CO-SCR) reaction in the presence of O2. In this study, we synthesized the CoCeOx-PVP catalyst via a coprecipitation method and employed various characterization techniques, including BET, SEM, XRD, Raman, XPS, H2-TPR, and O2-TPD. The analysis results indicate that the addition of polyvinylpyrrolidone (PVP) alters the surface structure of the catalyst, increases the particle size, and enhances the concentration of surface oxygen vacancies. These structural effects facilitate electron circulation and accelerate the migration of oxygen species, thereby improving the catalytic reduction performance of the catalyst and increasing the conversion rate of NOx. At 250 °C and with 5 vol% O2, the conversion rates of NOx and CO can attain 98% and 96%, respectively, accompanied by a remarkable N2 selectivity of 99%. Following a sustained reaction period of 6 h, the conversion efficiencies of both NOx and CO remain above 95%. However, during extended testing periods, as the oxygen vacancies are progressively occupied by O2, the oxygen vacancies generated through the reduction of NO with CO fall short of sustaining the CO-SCR reaction over the long haul. Subsequently, the oxidation reactions of NO and CO come to dominate, resulting in a decline in the NOx conversion rate. Notably, the CO conversion rate still maintains 100% at this point. Based on the results of in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) experiments, we proposed a reaction mechanism for the CO-SCR process over the CoCeOx-PVP catalyst under O2-containing conditions. This study provides an effective strategy for the application of non-noble metal catalysts in the field of CO-SCR. Although maintaining long-term activity of the catalyst remains a challenge in the presence of O2, the catalyst in this study exhibits a slower deactivation rate compared to traditional non-noble metal catalysts. Full article
(This article belongs to the Special Issue Novel Nanocatalysts for Gaseous-Pollutants Purification)
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