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Special Issue "DeNOx Systems and VOCs (Volatile Organic Compounds) for Pollution Abatement in Catalysis"

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

Deadline for manuscript submissions: closed (10 December 2021) | Viewed by 11476

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Special Issue Editors

Dr. Giuseppe Pantaleo

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Institute of Nanostructured Materials, CNR - ISMN, Via Ugo La Malfa 153, 90146 Palermo, Italy
Interests: heterogeneous catalysis; pollution abatement (deNOx and VOC); temperature-programmed characterization; hydrogen production (dry reforming and partial oxidation of methane); PROX
Special Issues, Collections and Topics in MDPI journals

Dr. Leonarda Liotta

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Institute of Nanostructured Materials, Palermo Research Division, CNR - ISMN, Via Ugo La Malfa 153, 90146 Palermo, Italy
Interests: heterogeneous catalysts for CO₂ valorization; dry and steam reforming of methane; autothermal reactions; thermal and photothermal activation; H₂ purification; WGS reaction and PROX; CO₂ hydrogenation; methanation reaction; CO₂ electrochemical reduction; SOECs; SOFCs; catalytic devices for VOCs abatement (indoor and outdoor); CO and CH₂ oxidation; NO SCR by NH₃, HC, EtOH; antifouling and bactericidal activity of green materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nowadays, environmental pollution control plays a fundamental role in order to preserve human health. Many chronic respiratory diseases and premature deaths could be avoided by keeping high air quality levels, especially in places where human beings live.

In this context, many governments with new severe legislations are trying to limit the environment pollution impact.

Both volatile organic compounds (VOCs) and NO_x emissions contribute to the poor quality of air in our cities. The importance of heterogeneous catalysis to abate VOC and NO_x emissions is widely recognized; however, the improvement of catalysts is still demanding. The goal is to obtain more efficient catalysts to apply in VOC catalytic oxidation and in DeNOx technologies, increasing at the same time conversion and selectivity with low-energy consumption. In addition, due to the limited resources of noble metals and the cost of the current technologies adopted for DeNO_x, like ammonia SCR, it is necessary to find efficient and cheap solutions. Attention will be payed to the catalytic activity and selectivity of supported noble metals, reducible oxides, and perovskite materials, and to the relationship between physico-chemical properties and catalytic performances. The effects of CO₂, H₂O, and SO_x in the exhausts composition will be also addressed.

The idea of this Special Issue is to focus the attention of the scientific community in designing new catalysts and technologies for VOC (indoor and outdoor) and NO_x abatement, indicating a clear way for a near future in which material chemistry can play an important part for a sustainable world.

Dr. Giuseppe Pantaleo
Dr. Leonarda Francesca Liotta
Guest Editors

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

VOCs
NOx abatement
Indoor and outdoor pollution
Supported noble metals
Reducible oxides
Poisoning effects
Ageing times
CO₂, H₂O and SO_x effects

Related Special Issues

Selective Catalytic Reduction: From Basic Science to deNOx Applications II in Catalysts (1 article)
NOx, VOCs (Volatile Organic Compounds) and Soot Emission Control in Catalysis, 2nd Edition in Catalysts (1 article)

Published Papers (5 papers)

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Research

Open AccessFeature PaperArticle

Investigation of Co₃O₄ and LaCoO₃ Interaction by Performing N₂O Decomposition Tests under Co₃O₄-CoO Transition Temperature

Ewa M. Iwanek (nee Wilczkowska)

and

Catalysts 2021, 11(3), 325; https://doi.org/10.3390/catal11030325 - 04 Mar 2021

Cited by 2 | Viewed by 1798

Abstract

The research presented in this paper addresses the question: How does the addition of a small amount of LaCoO₃ impact the activity of a Co₃O₄ catalyst? By testing such a catalyst in N₂O decomposition under conditions at which the thermal decomposition of Co₃O₄ to CoO is possible, one gains unique insight into how the two phases interact. The activity of such a catalyst increases in the entire studied temperature range, unlike the activity of the undoped cobalt catalyst which is lower at 850 °C than at 800 °C due to the reduction of Co₃O₄ to CoO. XRD measurements showed that CoO was also the main cobalt oxide present in the Co3.5La catalyst after operating at 850 °C, as did the XPS measurements, but there was no drop of activity associated with this change. The influence of NO, O₂ and H₂O on the activity of the new catalyst, Co3.5La, was determined. Lack of positive effect of NO, a known oxygen scavenger, on the activity was noticed at all temperatures, showing that the effect of LaCoO₃ is probably due to increased oxygen desorption. Temperature programed oxidation (TPO) tests showed that the beneficial effects of the presence of LaCoO₃ on the activity of cobalt oxide at 850 °C were probably caused by enhanced diffusion of O²⁻ anions through the entire catalyst, which facilitates desorption of oxygen molecules from the surface. Full article

(This article belongs to the Special Issue DeNOx Systems and VOCs (Volatile Organic Compounds) for Pollution Abatement in Catalysis)

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Open AccessArticle

Improved SO₂ Tolerance of Cu-SAPO-18 by Ce-Doping in the Selective Catalytic Reduction of NO with NH₃

and

Catalysts 2020, 10(7), 783; https://doi.org/10.3390/catal10070783 - 13 Jul 2020

Cited by 11 | Viewed by 2093

Abstract

The Ce-Cu-SAPO-18 catalysts were prepared using the ion exchange method. The impact of sulfur dioxide on catalytic performance of Ce-Cu-SAPO-18 for the selective catalytic reduction (SCR) of NO with NH₃ was examined. Detailed characterization of the fresh and sulfur-poisoning Cu-SAPO-18 and Ce-Cu-SAPO-18 samples was conducted. XRD and BET results show that SO₂ treatment of the Ce-doped Cu-SAPO-18 (Ce-Cu-SAPO-18-S) sample did not induce a remarkable change in structure, as compared with that of the fresh counterpart. According to in situ DRIFT, H₂-TPR, SEM, and EDS results, it is found that the sulfation species attached preferentially to the cerium species, rather than the isolated Cu²⁺ species. In particular, the TG/DSC results confirm that the sulfate species on the Ce-Cu-SAPO-18-S sample was easier to decompose than that on the Cu-SAPO-18-S sample. The catalytic active sites of Ce-Cu-SAPO-18 were less influenced after SO₂ treatment, as demonstrated by the TPR and XPS results. All of the above results show that the Ce-Cu-SAPO-18 sample exhibited better sulfur-resistant performance than the Cu-SAPO-18 sample. Full article

(This article belongs to the Special Issue DeNOx Systems and VOCs (Volatile Organic Compounds) for Pollution Abatement in Catalysis)

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Open AccessFeature PaperArticle

Catalytic and Electrochemical Properties of Ag Infiltrated Perovskite Coatings for Propene Deep Oxidation

and

Catalysts 2020, 10(7), 729; https://doi.org/10.3390/catal10070729 - 01 Jul 2020

Cited by 1 | Viewed by 2234

Abstract

This study reports the catalytic properties of Ag nanoparticles dispersed on mixed ionic and electronic conducting layers of LSCF (La_0.6Sr_0.4Co_0.2Fe_0.8O₃) for propene combustion. A commercial and a synthesized LSCF powder were deposited by screen-printing or spin-coating on dense yttria-stabilized zirconia (YSZ) substrates, an oxygen ion conductor. Equal loadings (50 µg) of Ag nanoparticles were dispersed via drop-casting on the LSCF layers. Electrochemical and catalytic properties have been investigated up to 300 °C with and without Ag in a propene/oxygen feed. The Ag nanoparticles do not influence the electrochemical reduction of oxygen, suggesting that the rate-determining step is the charge transfer at the triple phase boundaries YSZ/LSCF/gas. The anodic electrochemical performances correlate well with the catalytic activity for propene oxidation. This suggests that the diffusion of promoting oxygen ions from YSZ via LSCF grains can take place toward Ag nanoparticles and promote their catalytic activity. The best specific catalytic activity, achieved for a LSCF catalytic layer prepared by screen-printing from the commercial powder, is 800 times higher than that of a pure Ag screen-printed film. Full article

(This article belongs to the Special Issue DeNOx Systems and VOCs (Volatile Organic Compounds) for Pollution Abatement in Catalysis)

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Open AccessArticle

Room-Temperature Nitrophenol Reduction over Ag–CeO₂ Catalysts: The Role of Catalyst Preparation Method

and

Catalysts 2020, 10(5), 580; https://doi.org/10.3390/catal10050580 - 21 May 2020

Cited by 12 | Viewed by 2626

Abstract

Ag–CeO₂ catalysts (20 mol % Ag) were synthesized using different techniques (co-precipitation, impregnation, and impregnation of pre-reduced ceria), characterized by XRD, N₂ sorption, TEM, H₂-TPR methods, and probed in room-temperature p-nitrophenol reduction into p-aminophenol in aqueous solution at atmospheric pressure. The catalyst preparation method was found to determine the textural characteristics, the oxidation state and distribution of silver and, hence, the catalytic activity in the p-nitrophenol reduction. The impregnation technique was the most favorable for the formation over the ceria surface of highly dispersed silver species that are active in the p-nitrophenol reduction (the first-order rate constant k = 0.656 min⁻¹). Full article

(This article belongs to the Special Issue DeNOx Systems and VOCs (Volatile Organic Compounds) for Pollution Abatement in Catalysis)

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Open AccessArticle

Propane and Naphthalene Oxidation over Gold-Promoted Cobalt Catalysts Supported on Zirconia

María Silvia Leguizamón Aparicio

María Lucia Ruiz

Marco Antonio Ocsachoque

Marta Isabel Ponzi

Enrique Rodríguez-Castellón

and

Ileana Daniela Lick

Catalysts 2020, 10(4), 387; https://doi.org/10.3390/catal10040387 - 02 Apr 2020

Cited by 3 | Viewed by 1709

Abstract

Zirconia-supported gold-promoted cobalt catalysts were synthesized and tested for the complete oxidation of propane and naphthalene. The catalysts were characterized by BET surface area, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), powder X-ray diffraction (XRD), transmission electron microscopy (TEM), temperature-programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS). In both propane and naphthalene combustion reactions, the results obtained indicate that catalysts formulated with Co₃O₄ are more active than those containing only Au. Catalysts prepared using the deposit/precipitation (DP) method have better activity than those in which the traditional technique is used. Gold addition using the DP methods generates a promoting effect on the activity of cobalt-containing catalysts. The AuDpCoZt catalyst was found to be the most active for both propane and naphthalene combustion. The catalytic behavior of this sample is associated with a synergic effect between gold, cobalt, and the support, which is also evidenced by an increase in the reducibility of this catalytic system. The effect of the presence of NO in the feed was also analyzed for propane combustion. Full article

(This article belongs to the Special Issue DeNOx Systems and VOCs (Volatile Organic Compounds) for Pollution Abatement in Catalysis)

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