Recent Advances in Catalysis for Environmental Applications and Chemical Synthesis

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

Deadline for manuscript submissions: closed (15 November 2020) | Viewed by 15105

Special Issue Editor


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Guest Editor
Faculty of Chemistry, Adam Mickiewicz University in Poznań, ul. Universytetu Poznańskiego 8, 61-614 Poznan, Poland
Interests: catalysis; catalytic processes; green chemistry; catalyst characterization; nanomaterials
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Special Issue Information

Dear Colleagues, 

The general studies of catalysts used in environmental pollution abatement have especially focused on those applied in industrial processes. This includes the catalytic elimination of environmental pollutants such as volatile organic compounds, sulfur compounds, carbon monoxide, nitrogen oxides, and soot emitted by the chemical or automotive industry. Submissions to this Special Issue should be based on the newest achievements in the synthesis and characterization of catalysts and their application in environmental pollution abatement, especially as applied to industrial processes. The novel catalysts obtained according to the green chemistry rules should be thoroughly characterized before and after their performance in catalytic tests.

Other topics of interest include the application of photocatalysis in the production of clean energy, hydrogen generation via catalytic fuel processing, and the synthesis of new electrocatalysts for fuel cells. Clean and low-temperature catalytic processes, e.g., new catalytic combustion technologies, in which crude and waste compounds are applied to the preparation of useful chemicals are also of interest, as well as the elimination of toxic compounds in the chemical industry through application of environmentally friendly catalysts. 

Dr. Piotr Kaminski
Guest Editor

Manuscript Submission Information

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Keywords

  • green chemistry
  • catalytic elimination of environmental pollutants
  • photocatalysis
  • materials characterization
  • low-temperature catalytic oxidation
  • production of fine chemicals

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Published Papers (4 papers)

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Research

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22 pages, 4616 KiB  
Article
The Application of Copper-Gold Catalysts in the Selective Oxidation of Glycerol at Acid and Basic Conditions
by Piotr Kaminski
Catalysts 2021, 11(1), 94; https://doi.org/10.3390/catal11010094 - 12 Jan 2021
Cited by 2 | Viewed by 2801
Abstract
The crude glycerol is produced during the transesterification of animal fats and vegetable oils, but it is a by-product of this process. Currently, its elimination is a problem in the chemical industry. The main goal of this work was the preparation, characterization and [...] Read more.
The crude glycerol is produced during the transesterification of animal fats and vegetable oils, but it is a by-product of this process. Currently, its elimination is a problem in the chemical industry. The main goal of this work was the preparation, characterization and application of mesoporous cerium-zirconium oxide as supports for copper and gold species and the comparison of selected factors on the properties of catalysts in glycerol oxidation in the liquid phase. The samples were characterized using adsorption and desorption of nitrogen, XRD, UV-vis, XPS, TEM, SEM, and STEM-EDXS. The obtained results of glycerol oxidation show that the bimetallic copper-gold catalysts are more active and selective to glyceric acid in this reaction than analogous monometallic gold catalysts. Additionally, bimetallic catalysts are also characterized by the catalytic stability, and their application leads to the increase of selectivity to glyceric acid during their reusing in glycerol oxidation in alkali media. In this work, the influence of selected factors, e.g., oxygen source and its pressure, solution pH, and base content on the catalytic activity of bimetallic catalysts is discussed. Full article
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18 pages, 4507 KiB  
Article
The Influence of Calcination Temperature on Photocatalytic Activity of TiO2-Acetylacetone Charge Transfer Complex towards Degradation of NOx under Visible Light
by Lucas A. Almeida, Margarita Habran, Rafael dos Santos Carvalho, Marcelo E. H. Maia da Costa, Marco Cremona, Bruno C. Silva, Klaus Krambrock, Omar Ginoble Pandoli, Edisson Morgado Jr. and Bojan A. Marinkovic
Catalysts 2020, 10(12), 1463; https://doi.org/10.3390/catal10121463 - 14 Dec 2020
Cited by 19 | Viewed by 3814
Abstract
The improvement of photocatalytic activity of TiO2-based nanomaterials is widely investigated due to the tentative of their industrialization as environmental photocatalysts and their inherently low solar spectrum sensitivity and rapid recombination of charge carriers. Coupling of oxygen-based bidentate diketone to nanocrystalline [...] Read more.
The improvement of photocatalytic activity of TiO2-based nanomaterials is widely investigated due to the tentative of their industrialization as environmental photocatalysts and their inherently low solar spectrum sensitivity and rapid recombination of charge carriers. Coupling of oxygen-based bidentate diketone to nanocrystalline TiO2 represents a potential alternative for improving the holdbacks. Formation of TiO2-acetylacetone charge transfer complex (CTC) by sol-gel route results in a hybrid semiconductor material with photodegradation activity against toxic NOx gas. In this research, the influence of the chelating agent acetylacetone (ACAC) content on the CTC photocatalytic efficiency under visible light was evaluated. A high content of ACAC in the CTC is not a decisive factor for efficiency of photocatalytic reactions. In fact, the highest efficiency for NOx degradation (close to 100%, during 1 h of visible light exposure) was reported for the material calcined in air at 300 °C with the content of strongly bonded acetylacetone not higher than 3 wt.%. Higher calcination temperature (400 °C) left TiO2 almost completely depleted in ACAC, while at the highest applied temperature (550 °C) a portion of anatase was transformed into rutile and the sample is free of ACAC. The analyses pointed out that superoxide anion radical (O2) plays an active role in photo-oxidation of NOx. Our findings indicate that this CTC has both high visible light spectral sensitivity and photocatalytic efficiency. Full article
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13 pages, 3675 KiB  
Article
Influence of the Active Phase (Fe, Ni, and Ni–Fe) of Mixed Oxides in CWAO of Crystal Violet
by Katherine Archila, Ana María Campos, Lorena Lugo, Crispín Astolfo Celis, Sonia Moreno, Tomas Ramirez Reina and Alejandro Pérez-Flórez
Catalysts 2020, 10(9), 1053; https://doi.org/10.3390/catal10091053 - 14 Sep 2020
Cited by 4 | Viewed by 2381
Abstract
The catalytic oxidation of aqueous crystal violet (CV) solutions was investigated using Ni and Fe catalysts supported over Mg–Al oxides synthesized by the autocombustion method. The influence of temperature, loading, and selectivity were studied in the catalytic wet air oxidation (CWAO) of CV. [...] Read more.
The catalytic oxidation of aqueous crystal violet (CV) solutions was investigated using Ni and Fe catalysts supported over Mg–Al oxides synthesized by the autocombustion method. The influence of temperature, loading, and selectivity were studied in the catalytic wet air oxidation (CWAO) of CV. The kind of metal had an important contribution in the redox process as significant differences were observed between Fe, Ni, and their mixtures. The catalysts with only Fe as active phase were more efficient for the oxidation of CV under normal conditions (T = 25 °C and atmospheric pressure) compared to those containing Ni, revealing the influence of the transition metal on catalytic properties. It was found that iron-containing materials displayed enhanced textural properties. The synthesis of Fe/MgAl catalysts by the autocombustion method led to solids with excellent catalytic behavior, 100% CV degradation in eight hours of reaction, 68% selectivity to CO2, and significant reduction of chemical oxygen demand (COD). Full article
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Review

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32 pages, 3950 KiB  
Review
Progress in Graphene/Metal Oxide Composite Photocatalysts for Degradation of Organic Pollutants
by Xiaodong Hong, Xu Wang, Yang Li, Jiawei Fu and Bing Liang
Catalysts 2020, 10(8), 921; https://doi.org/10.3390/catal10080921 - 11 Aug 2020
Cited by 32 | Viewed by 5393
Abstract
The sewage discharge of industrial wastewater seriously pollutes the water source and rivers, which is very harmful to the health of humans and wildlife. Among those methods for treating wastewater, photocatalysis is a sustainable and environmental-friendly technique for removing the organic pollutants with [...] Read more.
The sewage discharge of industrial wastewater seriously pollutes the water source and rivers, which is very harmful to the health of humans and wildlife. Among those methods for treating wastewater, photocatalysis is a sustainable and environmental-friendly technique for removing the organic pollutants with no secondary pollution. As a popular photocatalyst, graphene/metal oxide nanocomposites have been widely reported in the photocatalysis field. In this review, the recent progress of graphene/metal oxide composites including binary and ternary composites is summarized in detail. The synthesis, microstructure design, and application performance of graphene/TiO2, graphene/ZnO, graphene/SnO2, graphene/WO3, graphene/Fe2O3, and graphene/Cu2O composites are introduced firstly. Then, the synthesis, the selection of components, and the performance of various ternary composites are summarized specifically, including graphene/TiO2-, graphene/ZnO-, graphene/SnO2-, graphene/Cu2O-, graphene/FexOy-, and graphene/Bi-containing ternary composites. At last, the possible research directions of graphene/metal oxide nanocomposites are put forward. The main purpose is to provide a theoretical guidance for designing high-performance graphene/metal oxide photocatalysts for wastewater treatment. Full article
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