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Advanced Porous Materials for Gas Adsorption and Environmental Catalysis
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Advanced Porous Materials for Gas Adsorption and Environmental Catalysis

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (30 September 2018) | Viewed by 22262

Special Issue Editors

Prof. Dr. Enrique Rodríguez-Castellón

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Guest Editor
Departamento de Química Inorgánica, Universidad de Málaga, 29016 Málaga, Spain
Interests: nanoporous materials; XPS; adsorption; heterogeneous catalysis
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Célio Loureiro Cavalcante Jr.

E-Mail Website
Guest Editor
Departamento de Engenharia Química, Universidade Federal do Ceará, Fortaleza, Brazil
Interests: adsorption and diffusion fundamentals; adsorption processes; separation processes; CO2 capture and storage
Dr. Juan Antonio Cecilia

E-Mail Website
Guest Editor
Departamento de Química Inorgánica, Cristalografía y Mineralogía, Universidad de Málaga, 29071 Málaga, Spain
Interests: adsorption; biomass valorization; heterogeneous catalysis; high-added value products
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue, entitled “Advanced Porous Materials for Gas Adsorption and Environmental Catalysis”, is dedicated to synthesis characterization of materials with nanoporosity, such as porous silica of type MCM-41, HMS or SBA-15, zeolites and zeotypes, porous metallic oxides, pillared clays, carbons, MOFs and hybrid materials with applications in gas adsorption, and for gas separation for chromatographic applications or gas capture mainly addressing environmental problems concerned the global climate change, and as catalyst support and reaction of environmental interest, such as combustion of volatile organic compounds (VOCs), selective catalytic reduction of ammonia (NOx-SCR), hydrodesulfurization (HDS), hydrodenitrogenation (HDN) and hydrodeoxygenation (HDO) of different types of fuels. Contributions must include innovative synthesis strategies to obtain porous materials with low costs or to graft functionalities to improve their adsorption capacity and selectivity, but also to promote different active phases for a better catalytic performance. Reviews and research contributions are welcome.

Prof. Enrique Rodríguez-Castellón
Prof. Célio Loureiro Cavalcante Jr.
Dr. Juan A. Cecilia
Guest Editors

Manuscript Submission Information

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Keywords

  • Nanoporous solids
  • MCM-41
  • SBA-15
  • Pillared clays
  • Zeolites
  • MOFs
  • Adsorption
  • CO2 capture
  • Gas separation
  • Environmental Catalysis
  • Combustion of VOCs
  • Hydrotretaing
  • NOx-SCR

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Published Papers (5 papers)

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Research

17 pages, 2896 KiB  
Article
Adsorption of Pb (II) Ions onto Hydroxyapatite Nanopowders in Aqueous Solutions
by Simona Liliana Iconaru, Mikael Motelica-Heino, Regis Guegan, Mircea Beuran, Adrian Costescu and Daniela Predoi
Materials 2018, 11(11), 2204; https://doi.org/10.3390/ma11112204 - 7 Nov 2018
Cited by 48 | Viewed by 4265
Abstract
Contamination of water with heavy metals such as lead is a major worldwide problem because they affect the physiological functions of living organisms, cause cancer, and damage the immune system. Hydroxyapatite, (Ca5(PO4)3OH) is considered one of the [...] Read more.
Contamination of water with heavy metals such as lead is a major worldwide problem because they affect the physiological functions of living organisms, cause cancer, and damage the immune system. Hydroxyapatite, (Ca5(PO4)3OH) is considered one of the most effective materials for removing heavy metals from contaminated water. The hydroxyapatite nanopowders (N-HAp) obtained by a co-precipitation method were used in this research to determine the effectiveness in removing lead ions from contaminated solutions. In this study, we have investigated the structure and morphology of N-HAp nanopowders using X-ray diffraction (XRD), electronic transmission microscopy (TEM), and scanning electron microscopy (SEM). The structure information was also obtained by spectroscopy measurements. The Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy measurements revealed the presence of peaks corresponding to the phosphate and hydroxyl groups. The ability of N-HAp nanopowders to adsorb lead ions from aqueous solutions were established. The results of the kinetic and equilibrium studies on the removal of Pb (II) from aqueous solution revealed that the adsorption of lead (II) cations is due to the surface reaction with the hydroxyl terminal groups on the adsorbent and the combination of the positive charges of the metal cations with the negative charges on the adsorbent surfaces. These observations could validate the use of these ceramic nanopowders in ecological remediation strategies. Full article
(This article belongs to the Special Issue Advanced Porous Materials for Gas Adsorption and Environmental Catalysis)
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18 pages, 2762 KiB  
Article
Natural and Modified Montmorillonite Clays as Catalysts for Synthesis of Biolubricants
by Francisco Murilo Tavares Luna, Juan Antonio Cecilia, Rosana Maria Alves Saboya, Deicy Barrera, Karim Sapag, Enrique Rodríguez-Castellón and Célio Loureiro Cavalcante
Materials 2018, 11(9), 1764; https://doi.org/10.3390/ma11091764 - 18 Sep 2018
Cited by 42 | Viewed by 4789
Abstract
In this study, natural and modified clays were evaluated as catalysts in an esterification reaction to obtain bio-based lubricants. The biolubricants are environmentally preferred to petroleum-based lubricants because they are biodegradable and non-toxic. Other advantages include very low volatility due to the high [...] Read more.
In this study, natural and modified clays were evaluated as catalysts in an esterification reaction to obtain bio-based lubricants. The biolubricants are environmentally preferred to petroleum-based lubricants because they are biodegradable and non-toxic. Other advantages include very low volatility due to the high molecular weight and excellent viscosity properties with temperature variations. Modifications in natural clay were performed intending to obtain materials with different textural properties that could improve the reaction under study. The modified clays were obtained in two ways: by pillarization using Al13 Keggin polyoxocations or by acid treatments with H2SO4, HCl and HNO3. All samples were evaluated for the esterification reaction of fatty acids from castor oil (FACO) using 2-ethyl-hexanol. During the reaction step, a zeolite-based adsorbent was used for water removal to increase the reaction equilibrium conversion. Gas chromatography and nuclear magnetic resonance were performed to ensure the formation of the products. The highest conversion of fatty acids to esters was obtained using pillared clays. Adding adsorbent in the reaction medium (10 g of 3A zeolite to 100 g of FACO), the conversion improved from 74–88 wt % after 6 h at 50 °C. Full article
(This article belongs to the Special Issue Advanced Porous Materials for Gas Adsorption and Environmental Catalysis)
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17 pages, 2999 KiB  
Article
Selective Oxidation of Hydrogen Sulfide to Sulfur Using Vanadium Oxide Supported on Porous Clay Heterostructures (PCHs) Formed by Pillars Silica, Silica-Zirconia or Silica-Titania
by Juan Antonio Cecilia, M. Dolores Soriano, Alejandro Natoli, Enrique Rodríguez-Castellón and José Manuel López Nieto
Materials 2018, 11(9), 1562; https://doi.org/10.3390/ma11091562 - 30 Aug 2018
Cited by 22 | Viewed by 4464
Abstract
Vanadium oxide (V2O5) species has been supported on different porous clay heterostructures (with silica pillars, silica-zirconia with a molar ratio Si/Zr = 5 and silica-titania with a molar ratio Si/Ti = 5) by wetness incipient method. All catalysts were [...] Read more.
Vanadium oxide (V2O5) species has been supported on different porous clay heterostructures (with silica pillars, silica-zirconia with a molar ratio Si/Zr = 5 and silica-titania with a molar ratio Si/Ti = 5) by wetness incipient method. All catalysts were characterized by X-ray diffraction (XRD), N2 adsorption-desorption at −196 °C, NH3 thermoprogrammed desorption (NH3-TPD), Raman spectroscopy, diffuse reflectance UV-Vis and X-ray photoelectron spectroscopy (XPS). After that, the catalytic activity of the vanadium-based catalysts was evaluated in the selective oxidation of H2S to elemental sulfur. The catalytic data show that both the activity and the catalytic stability increase with the vanadium content, obtaining the highest conversion values and sulfur yield for the catalysts with vanadium content of 16 wt.%. The comparison among all supports reveals that the incorporation of TiO2 species in the pillars of the PCH improves the resistance to the deactivation, attaining as best results a H2S conversion of 89% for SiTi-PCH-16V catalyst and elemental sulfur is the only compound detected by gas chromatography. Full article
(This article belongs to the Special Issue Advanced Porous Materials for Gas Adsorption and Environmental Catalysis)
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16 pages, 11744 KiB  
Article
Eco-Friendly Cavity-Containing Iron Oxides Prepared by Mild Routes as Very Efficient Catalysts for the Total Oxidation of VOCs
by Rut Sanchis, Daniel Alonso-Domínguez, Ana Dejoz, María Pilar Pico, Inmaculada Álvarez-Serrano, Tomás García, María Luisa López and Benjamín Solsona
Materials 2018, 11(8), 1387; https://doi.org/10.3390/ma11081387 - 9 Aug 2018
Cited by 16 | Viewed by 3812
Abstract
Iron oxides (FeOx) are non-toxic, non-expensive and environmentally friendly compounds, which makes them good candidates for many industrial applications, among them catalysis. In the present article five catalysts based on FeOx were synthesized by mild routes: hydrothermal in subcritical and supercritical conditions (Fe-HT, [...] Read more.
Iron oxides (FeOx) are non-toxic, non-expensive and environmentally friendly compounds, which makes them good candidates for many industrial applications, among them catalysis. In the present article five catalysts based on FeOx were synthesized by mild routes: hydrothermal in subcritical and supercritical conditions (Fe-HT, Few200, Few450) and solvothermal (Fe-ST1 and Fe-ST2). The catalytic activity of these catalysts was studied for the total oxidation of toluene using very demanding conditions with high space velocities and including water and CO2 in the feed. The samples were characterized by X-ray diffraction (XRD), scanning and high-resolution transmission electron microscopy (SEM and HRTEM), X-ray photoelectron spectroscopy (XPS) and nitrogen adsorption-desorption isotherms. It was observed that the most active catalyst was a cavity-containing porous sample prepared by a solvothermal method with a relatively high surface area (55 m2 g−1) and constituted by flower-like aggregates with open cavities at the catalyst surface. This catalyst displayed superior performance (100% of toluene conversion at 325 °C using highly demanding conditions) and this performance can be maintained for several catalytic cycles. Interestingly, the porous iron oxides present not only a higher catalytic activity than the non-porous but also a higher specific activity per surface area. The high activity of this catalyst has been related to the possible synergistic effect of compositional, structural and microstructural features emphasizing the role of the surface area, the crystalline phase present, and the properties of the surface. Full article
(This article belongs to the Special Issue Advanced Porous Materials for Gas Adsorption and Environmental Catalysis)
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14 pages, 5451 KiB  
Article
Composites of Laponite and Cu–Mn Hopcalite-Related Mixed Oxides Prepared from Inverse Microemulsions as Catalysts for Total Oxidation of Toluene
by Bogna D. Napruszewska, Alicja Michalik, Anna Walczyk, Dorota Duraczyńska, Roman Dula, Wojciech Rojek, Lidia Lityńska-Dobrzyńska, Krzysztof Bahranowski and Ewa M. Serwicka
Materials 2018, 11(8), 1365; https://doi.org/10.3390/ma11081365 - 6 Aug 2018
Cited by 6 | Viewed by 4004
Abstract
Composites of Laponite and Cu–Mn hopcalite-related mixed oxides, prepared from hydrotalcite-like (Htlc) precursors obtained in inverse microemulsions, were synthesized and characterized with XRF, XRD, SEM, TEM, H2 temperature-programmed reduction (TPR), and N2 adsorption/desorption at −196 °C. The Htlc precursors were precipitated [...] Read more.
Composites of Laponite and Cu–Mn hopcalite-related mixed oxides, prepared from hydrotalcite-like (Htlc) precursors obtained in inverse microemulsions, were synthesized and characterized with XRF, XRD, SEM, TEM, H2 temperature-programmed reduction (TPR), and N2 adsorption/desorption at −196 °C. The Htlc precursors were precipitated either with NaOH or tetrabutylammonium hydroxide (TBAOH). Al was used as an element facilitating Htlc structure formation, and Ce and/or Zr were added as promoters. The composites calcined at 600 °C are mesoporous structures with similar textural characteristics. The copper–manganite spinel phases formed from the TBAOH-precipitated precursors are less crystalline and more susceptible to reduction than the counterparts obtained from the precursors synthesized with NaOH. The Cu–Mn-based composites are active in the combustion of toluene, and their performance improves further upon the addition of promoters in the following order: Ce < Zr < Zr + Ce. The composites whose active phases are prepared with TBAOH are more active than their counterparts obtained with the use of the precursors precipitated with NaOH, due to the better reducibility of the less crystalline mixed oxide active phase. Full article
(This article belongs to the Special Issue Advanced Porous Materials for Gas Adsorption and Environmental Catalysis)
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