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

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 14420

Special Issue Editors


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Guest Editor
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
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Guest Editor
Institute of Nanostructured Materials, Palermo Research Division, CNR - ISMN, Via Ugo La Malfa 153, 90146 Palermo, Italy
Interests: supported noble metals; nanostructured and mesoporous materials; inorganic perovskites for application in NO SCR from exhaust gases (stationary and mobile sources); VOCs oxidation; dry/steam hydrocarbons reaction; CO2 methanation
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 NOx emissions contribute to the poor quality of air in our cities. The importance of heterogeneous catalysis to abate VOC and NOx 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 DeNOx, 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 SOx 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 NOx 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

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Keywords

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

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Published Papers (5 papers)

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Research

13 pages, 2976 KiB  
Article
Investigation of Co3O4 and LaCoO3 Interaction by Performing N2O Decomposition Tests under Co3O4-CoO Transition Temperature
by Ewa M. Iwanek (nee Wilczkowska), Leonarda F. Liotta, Giuseppe Pantaleo, Krzysztof Krawczyk, Ewa Gdyra, Jan Petryk, Janusz W. Sobczak and Zbigniew Kaszkur
Catalysts 2021, 11(3), 325; https://doi.org/10.3390/catal11030325 - 4 Mar 2021
Cited by 2 | Viewed by 2397
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 [...] Read more.
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
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17 pages, 3579 KiB  
Article
Improved SO2 Tolerance of Cu-SAPO-18 by Ce-Doping in the Selective Catalytic Reduction of NO with NH3
by Shuai Han, Qing Ye, Qi Gao and Hongxing Dai
Catalysts 2020, 10(7), 783; https://doi.org/10.3390/catal10070783 - 13 Jul 2020
Cited by 12 | Viewed by 2635
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 [...] Read more.
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
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15 pages, 4050 KiB  
Article
Catalytic and Electrochemical Properties of Ag Infiltrated Perovskite Coatings for Propene Deep Oxidation
by Thai Giang Truong, Benjamin Rotonnelli, Mathilde Rieu, Jean-Paul Viricelle, Ioanna Kalaitzidou, Daniel Marinha, Laurence Burel, Angel Caravaca, Philippe Vernoux and Helena Kaper
Catalysts 2020, 10(7), 729; https://doi.org/10.3390/catal10070729 - 1 Jul 2020
Cited by 2 | Viewed by 2653
Abstract
This study reports the catalytic properties of Ag nanoparticles dispersed on mixed ionic and electronic conducting layers of LSCF (La0.6Sr0.4Co0.2Fe0.8O3) for propene combustion. A commercial and a synthesized LSCF powder were deposited by [...] Read more.
This study reports the catalytic properties of Ag nanoparticles dispersed on mixed ionic and electronic conducting layers of LSCF (La0.6Sr0.4Co0.2Fe0.8O3) 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
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12 pages, 3160 KiB  
Article
Room-Temperature Nitrophenol Reduction over Ag–CeO2 Catalysts: The Role of Catalyst Preparation Method
by Mariia Chernykh, Natalia Mikheeva, Vladimir Zaikovskii, Mikhail Salaev, Leonarda F. Liotta and Grigory Mamontov
Catalysts 2020, 10(5), 580; https://doi.org/10.3390/catal10050580 - 21 May 2020
Cited by 15 | Viewed by 3316
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 [...] Read more.
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
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18 pages, 2911 KiB  
Article
Propane and Naphthalene Oxidation over Gold-Promoted Cobalt Catalysts Supported on Zirconia
by 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 - 2 Apr 2020
Cited by 4 | Viewed by 2102
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), [...] Read more.
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
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