Submit to Catalysts Review for Catalysts Propose a Special Issue

Journal Browser

► Journal Browser

Catalytic Treatment of Air Pollutants (VOCs, PACs, PCDDs/PCDFs, Soot, NOx, CO)

Print Special Issue Flyer
Special Issue Editors
Special Issue Information
Keywords
Published Papers

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

Deadline for manuscript submissions: closed (20 January 2022) | Viewed by 25543

Share This Special Issue

Special Issue Editors

Dr. Fan Lin

E-Mail Website
Guest Editor

Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA 99352, USA
Interests: heterogeneous catalysis; biomass conversion; emission control; soot oxidation; HC oxidation
Special Issues, Collections and Topics in MDPI journals

Prof. Dr. Jong-Ki Jeon

E-Mail Website
Guest Editor

Department of Chemical Engineering, Kongju National University, Cheonan 31080, Korea
Interests: environmental catalysis; NOx; air pollutants; VOCs; CO
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The preservation of clean air demands detailed scientific research taking into consideration practical conditions. To enhance sustainability, emissions reduction measures focused on the air pollutants (volatile organic compounds (VOCs), polyaromatic compounds (PACs), polychlorinated dioxins and furans (PCDDs/PCDFs), CO, NOx, and soot particles) need, thus, to be researched under practical conditions. These pollutants can be substantially reduced by catalytic exhaust systems and integrated methods.

This Special Issue aims to collect original research papers, reviews, and commentaries focused on the challenges for the catalytic treatment of air pollutants. Submissions are welcome especially (but not exclusively) in the following areas:

- catalytic treatment of VOCs;- catalytic treatment of CO;- catalytic treatment of NOx;- catalytic treatment of Soot;
- catalytic treatment of PACs;
- catalytic treatment of PCDDs/PCDFs;
- innovative processes and reactors for catalytic treatment of air pollutants.

Dr. Lin Fan
Prof. Jong-Ki Jeon
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

environmental catalysis
air pollutants
NOx
VOCs
CO

Published Papers (7 papers)

Download All Papers

Research

Jump to: Review

17 pages, 2408 KiB

Open AccessArticle

Properties of Iron-Modified-by-Silver Supported on Mordenite as Catalysts for NO_x Reduction

by Perla Sánchez-López, Yulia Kotolevich, Evgeny Khramov, Ramesh Kumar Chowdari, Miguel Angel Estrada, Gloria Berlier, Yan Zubavichus, Sergio Fuentes, Vitalii Petranovskii and Fernando Chávez-Rivas

Catalysts 2020, 10(10), 1156; https://0-doi-org.brum.beds.ac.uk/10.3390/catal10101156 - 09 Oct 2020

Cited by 7 | Viewed by 2451

Abstract

A series of mono and bimetallic catalysts based on a Fe-Ag mixture deposited on mordenite was prepared by ion-exchange and evaluated in the catalytic activity test of the de-NO_x reaction in the presence of CO/C₃H_6. The activity results showed that the most active samples were the Fe-containing ones, and at high temperatures, a co-promoter effect of Ag on the activity of Fe catalysts was also observed. The influence of the order of cation deposition on catalysts formation and their physicochemical properties was studied by FTIR (Fourier Transform Infrared Spectroscopy) of adsorbed NO, XANES (X-ray Absorption Near-Edge Structure), and EXAFS (Extended X-ray Absorption Fine Structure) and discussed in terms of the state of iron. Results of Fe K-edge XANES oscillations showed that, in FeMOR catalysts, iron was present in a disordered state as Fe³⁺ and Fe²⁺. In FeAgMOR, the prevailing species was Fe³⁺, while in the AgFeMOR catalyst, the state of iron was intermediate or mixed between FeMOR and FeAgMOR. The Fe K-edge EXAFS results were characteristic of a disordered phase, the first coordination sphere being asymmetric with two different Fe-O distances. In FeAgMOR and AgFeMOR, coordination of Fe-O was similar to Fe₂O₃ with a few amount of Fe²⁺ species. We may conclude that, in the bimetallic FeAgMOR and AgFeMOR samples, a certain amount of tetrahedral Al³⁺ ions in the mordenite framework is replaced by Fe³⁺ ions, confirming the previous reports that these species are active sites for the de-NO_x reaction. Based on the thermodynamic analysis and experimental data, also, it was confirmed that the order of deposition of the components influenced the mechanism of active sites’ formation during the two steps ion-exchange synthesis. Full article

(This article belongs to the Special Issue Catalytic Treatment of Air Pollutants (VOCs, PACs, PCDDs/PCDFs, Soot, NOx, CO))

► Show Figures

Figure 1

13 pages, 3163 KiB

Open AccessArticle

Particle Number Emissions of a Diesel Vehicle during and between Regeneration Events

by Barouch Giechaskiel

Catalysts 2020, 10(5), 587; https://0-doi-org.brum.beds.ac.uk/10.3390/catal10050587 - 23 May 2020

Cited by 34 | Viewed by 3221

Abstract

All modern diesel vehicles in Europe are equipped with diesel particulate filters (DPFs) and their particle number (PN) emissions at the tailpipe are close to ambient air levels. After the Dieselgate scandal for high NO_x emissions of diesel vehicles on the road, the high PN emissions during regeneration events are on the focus. The PN emissions of a diesel vehicle on the road and in the laboratory with or without regeneration events were measured using systems with evaporation tubes and catalytic strippers and counters with lower sizes of 23, 10 and 4 nm. The tests showed significant PN levels only during engine cold starts with a big fraction of sub-23 nm particles during the first minute. After the first seconds the sub-23 nm fraction was negligible. Urea injection at the selective catalytic reduction (SCR) for NO_x system did not affect the PN levels and the sub-23 nm fraction. The emissions during regeneration events were higher than the PN limit, but rapidly decreased 2-3 orders of magnitude below the limit after the regeneration. Artificially high sub-10 nm levels were seen during the regeneration (volatile artifact) at the system with the evaporation tube. The regenerations were forced every 100–350 km and the overall emissions including the regeneration events were two to four times lower than the current laboratory PN limit. The results of this study confirmed the efficiency of DPFs under laboratory and on-road driving conditions. Full article

(This article belongs to the Special Issue Catalytic Treatment of Air Pollutants (VOCs, PACs, PCDDs/PCDFs, Soot, NOx, CO))

► Show Figures

Figure 1

12 pages, 3461 KiB

Open AccessArticle

Enhanced Catalytic Performance of Hierarchical MnO_x/ZSM-5 Catalyst for the Low-Temperature NH₃-SCR

by Jing Shao, Shuyuan Cheng, Zhaoxu Li and Bichun Huang

Catalysts 2020, 10(3), 311; https://0-doi-org.brum.beds.ac.uk/10.3390/catal10030311 - 09 Mar 2020

Cited by 12 | Viewed by 2617

Abstract

A ZSM-5 zeolite with a hierarchical pore structure was synthesized by the desilication-recrystallization method using tetraethyl ammonium hydroxide (TEAOH) and cetyltrimethylammonium bromide (CTAB) as the desilication and structure-directing agents, respectively. The MnO_x/ZSM-5 catalyst was synthesized by the ethanol dispersion method and applied for the low-temperature selective catalytic reduction of NO_x with NH₃. The results showed that NO_x conversion of the hierarchical MnO_x/ZSM-5 catalyst could reach 100% at about 120 °C and could be maintained in the temperature range of 120–240 °C with N₂ selectivity over 90%. Furthermore, the hierarchical MnO_x/ZSM-5catalyst presented better SO₂ resistance performance than the traditional catalyst in the presence of 100 ppm SO₂ at 120 °C. XRD, SEM, TEM, XPS, BET, NH₃-TPD, and TG were applied to characterize the structural properties of the MnO_x/ZSM-5 catalysts. These results showed that the MnO_x/ZSM-5 catalyst had micropores (0.78 nm) and mesopores (3.2 nm) leading to a larger specific surface area, which improved the mass transfer of reactants and products while reducing the formation of sulfates. The better catalytic performance over hierarchical MnO_x/ZSM-5 catalyst could be attributed to the higher concentration of Mn⁴⁺ and chemisorbed oxygen species and higher surface acidity. The improved SO₂ resistance was related to the catalyst’s hierarchical pore structure. Full article

(This article belongs to the Special Issue Catalytic Treatment of Air Pollutants (VOCs, PACs, PCDDs/PCDFs, Soot, NOx, CO))

► Show Figures

Figure 1

13 pages, 3981 KiB

Open AccessArticle

Nanosized V-Ce Oxides Supported on TiO₂ as a Superior Catalyst for the Selective Catalytic Reduction of NO

by Long Lu, Xueman Wang, Chunhua Hu, Ying Liu, Xiongbo Chen, Ping Fang, Dingsheng Chen and Chaoping Cen

Catalysts 2020, 10(2), 202; https://0-doi-org.brum.beds.ac.uk/10.3390/catal10020202 - 07 Feb 2020

Cited by 6 | Viewed by 2210

Abstract

Nanosized V-Ce oxides supported on TiO₂ (VCT) were prepared and utilized in the low-temperature selective catalytic reduction (SCR) of NO with NH₃. Compared with the other V-Ce oxides-based catalysts supported on Al₂O₃, ZrO₂, and ZSM-5, VCT showed the best SCR activity in a low-temperature range. The NOx conversion of 90% could be achieved at 220 °C. Characterizations including X-ray diffraction (XRD), scanning election micrograph (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption with NH₃ (NH₃-TPD), and temperature-programmed reduction with H₂ (H₂-TPR) showed that V_1.05Ce₁/TiO₂ exhibited a good dispersion of V₂O₅, enrichment of surface Ce³⁺ and chemical-absorbed oxygen, and excellent redox capacity and acidity, which resulted in the best SCR performance at low temperature. Full article

(This article belongs to the Special Issue Catalytic Treatment of Air Pollutants (VOCs, PACs, PCDDs/PCDFs, Soot, NOx, CO))

► Show Figures

Graphical abstract

14 pages, 5848 KiB

Open AccessArticle

In Situ IR Study on Effect of Alkyl Chain Length between Amines on Its Stability against Acidic Gases

by Rose Mardie Pacia, Clinton Manianglung and Young Soo Ko

Catalysts 2019, 9(11), 910; https://0-doi-org.brum.beds.ac.uk/10.3390/catal9110910 - 30 Oct 2019

Cited by 6 | Viewed by 3084

Abstract

For the CO₂ capture process via the cyclic adsorption/desorption method, one emerging catalyst is the use of amine-functionalized silica. This study focused on comparing the CO₂ capture performance of diamines with ethyl and propyl spacers and the degradation species formed after long-term exposure to various acidic gases such as SO₂ and NO₂ at elevated temperatures. Adsorbents were prepared via the incipient wetness technique and then subjected to thermogravimetric measurements and in situ FT-IR analyses. 2NS-P/Kona95, which contains a propyl spacer, showed fewer degradation species formed based on its IR spectra and better stability with its long-term exposure to various acidic gases. Thus, the incorporation of amines with a large number of nitrogen groups of propyl or longer spacer length could be a promising CO₂ capture material. Full article

(This article belongs to the Special Issue Catalytic Treatment of Air Pollutants (VOCs, PACs, PCDDs/PCDFs, Soot, NOx, CO))

► Show Figures

Figure 1

Review

Jump to: Research

19 pages, 1945 KiB

Open AccessReview

Noble-Metal-Based Catalytic Oxidation Technology Trends for Volatile Organic Compound (VOC) Removal

by Hyo-Sik Kim, Hyun-Ji Kim, Ji-Hyeon Kim, Jin-Ho Kim, Suk-Hwan Kang, Jae-Hong Ryu, No-Kuk Park, Dae-Sik Yun and Jong-Wook Bae

Catalysts 2022, 12(1), 63; https://0-doi-org.brum.beds.ac.uk/10.3390/catal12010063 - 07 Jan 2022

Cited by 25 | Viewed by 4853

Abstract

Volatile organic compounds (VOCs) are toxic and are considered the most important sources for the formation of photochemical smog, secondary organic aerosols (SOAs), and ozone. These can also greatly affect the environment and human health. For this reason, VOCs are removed by applying various technologies or reused after recovery. Catalytic oxidation for VOCs removal is widely applied in the industry and is regarded as an efficient and economical method compared to other VOCs removal technologies. Currently, a large amount of VOCs are generated in industries with solvent-based processes, and the ratio of aromatic compounds is high. This paper covers recent catalytic developments in VOC combustion over noble-metal-based catalysts. In addition, this report introduces recent trends in the development of the catalytic mechanisms of VOC combustion and the deactivation of catalysts, such as coke formation, poisoning, sintering, and catalyst regeneration. Since VOC oxidation by noble metal catalysts depends on the support of and mixing catalysts, an appropriate catalyst should be used according to reaction characteristics. Moreover, noble metal catalysts are used together with non-noble metals and play a role in the activity of other catalysts. Therefore, further elucidation of their function and catalytic mechanism in VOC removal is required. Full article

(This article belongs to the Special Issue Catalytic Treatment of Air Pollutants (VOCs, PACs, PCDDs/PCDFs, Soot, NOx, CO))

► Show Figures

Figure 1

39 pages, 12695 KiB

Open AccessReview

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

by Zhisong Liu, Feng Yu, Cunhua Ma, Jianming Dan, Jian Luo and Bin Dai

Catalysts 2019, 9(9), 771; https://0-doi-org.brum.beds.ac.uk/10.3390/catal9090771 - 13 Sep 2019

Cited by 28 | Viewed by 6207

Abstract

Nitrogen oxides (NO_x) represent one of the main sources of haze and pollution of the atmosphere as well as the causes of photochemical smog and acid rain. Furthermore, it poses a serious threat to human health. With the increasing emission of NO_x, it is urgent to control NO_x. According to the different mechanisms of NO_x removal methods, this paper elaborated on the adsorption method represented by activated carbon adsorption, analyzed the oxidation method represented by Fenton oxidation, discussed the reduction method represented by selective catalytic reduction, and summarized the plasma method represented by plasma-modified catalyst to remove NO_x. At the same time, the current research status and existing problems of different NO_x removal technologies were revealed and the future development prospects were forecasted. Full article

(This article belongs to the Special Issue Catalytic Treatment of Air Pollutants (VOCs, PACs, PCDDs/PCDFs, Soot, NOx, CO))

► Show Figures