Sustainable and scalable natural fiber welded palladium-indium catalysts for nitrate reduction

Durkin, David P.; Tao, Ye; Choi, Jung Il; Livi, Kenneth J. T.; Long, Hugh C. De; Trulove, Paul C.; Fairbrother, D. Howard; Haverhals, Luke M.; Shuai, Danmeng

doi:10.1016/j.apcatb.2017.09.029

Cited by 51 publications

(27 citation statements)

References 64 publications

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“…As shown in Figure 4d, the splitting of In 3d 5/2 peaks at a binding energy of 440.7 and 444.5 eV indicates the existence of In(0) (440.7 eV) and In (III) (444.5 eV). [ 55 ] The presence of an additional peak at 440.76 eV is linked to different chemical bonding for In.…”

Section: Resultsmentioning

confidence: 99%

Ultralow Thermal Conductivity in Dual‐Doped n‐Type Bi₂Te₃ Material for Enhanced Thermoelectric Properties

Musah

Novitskii

Serhiienko

et al. 2021

Adv Elect Materials

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Bismuth chalcogenides are promising materials for thermoelectric (TE) application due to their high power factor (product of the square of the Seebeck coefficient and electrical conductivity). However, their high thermal conductivity is an issue of concern. Single doping has proven to be useful in improving TE performance in recent years. Here, it is shown that dual isovalent doping shows the synergistic effect of thermal conductivity reduction and electron density control. The insertion of large atoms in the layered Bi2Te3 structure distorts the crystal lattice and contributes significantly to phonon scattering. The ultralow thermal conductivity (KT = 0.35 W m−1 K−1 at 473 K) compensates for the low power factor and thus enhances TE performance. The density functional theory electronic structure calculation results reveal deep defects states in the valence band, which influences the electronic transport properties of the system. Therefore, the dual dopants (indium and antimony) show a coupled effect of improvement in the density of state near the Fermi level and reduction in the conduction band minimum, thus enhancing electron density. Numerically, it is demonstrated that the dual doping favors acoustic phonon scattering and thus drastically reduces the thermal conductivity.

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Section: Resultsmentioning

confidence: 99%

Ultralow Thermal Conductivity in Dual‐Doped n‐Type Bi₂Te₃ Material for Enhanced Thermoelectric Properties

Musah

Novitskii

Serhiienko

et al. 2021

Adv Elect Materials

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“…There are some information in the literature concerning the utilization of supported Pd-In catalysts in nitrate reduction ( Witońska et al, 2008 ; Soares et al, 2009 ; Marchesini et al, 2010 ). In a recent study, Durkin et al reported the utilization of a lignocellulose-supported Pd-In catalyst for nitrate reduction ( Durkin et al, 2018 ), and claimed that it was 10 times more active and air-stable than Pd-Cu catalysts prepared in a similar way. However, there are only a few studies on the utilization of Pt-In catalysts in this process, and most of them use metal oxides as catalytic supports ( Marchesini et al, 2008 ).…”

Section: Introductionmentioning

confidence: 99%

Highly N2-Selective Activated Carbon-Supported Pt-In Catalysts for the Reduction of Nitrites in Water

et al. 2021

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The catalytic reduction of nitrites over Pt-In catalysts supported on activated carbon has been studied in a semi-batch reactor, at room temperature and atmospheric pressure, and using hydrogen as the reducing agent. The influence of the indium content on the activity and selectivity was evaluated. Monometallic Pt catalysts are very active for nitrite reduction, but the addition of up to 1 wt% of indium significantly increases the nitrogen selectivity from 0 to 96%. The decrease in the accessible noble metal surface area reduces the amount of hydrogen available at the catalyst surface, this favoring the combination of nitrogen-containing intermediate molecules to promote the formation of N2 instead of being deeply hydrogenated into NH4+. Several activated carbon-supported Pt-In catalysts, activated under different calcination and reduction temperatures, have been also evaluated in nitrite reduction. The catalyst calcined and reduced at 400°C showed the best performance considering both the activity and the selectivity to nitrogen. This enhanced selectivity is ascribed to the formation of Pt-In alloy. The electronic properties of Pt change upon alloy formation, as it is demonstrated by XPS.

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“…In recent years, natural fibers such pineapple, flax, jute, coconut, sugarcane bagasse, palm, and others have been extensively studied as an alternative to reinforce polymer matrix due to their advantages such as sustainable, low cost, low density and biodegradable features [1][2][3]. However, the incompatibility with nonpolar matrices, moisture adsorption and vulnerability to thermal degradation are the main disadvantages for the use of natural fibers in composites [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Polypropylene Composites Reinforced with Macadamia Nutshell Fibers

Cipriano¹,

Zanini²,

Dantas³

et al. 2019

Journal of Renewable Materials

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The use of natural fibers as an additive in polymeric matrices has attracted interest of the automotive industries, for its low cost, mechanical properties, biodegradability and lightness. However, the hydrophilic nature of the fiber makes polymer compatibility difficult. Fiber surface treatments can be used to enhance the fiber/matrix interface. In the present work, polypropylene (PP) composites reinforced with fibers from macadamia nutshell were obtained and characterized. Macadamia nutshell fibers were treated by an alkaline treatment with sodium hydroxide (NaOH 4%) to improve adhesion between fibers and matrix. Fibers were characterized by techniques of Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD). The PP was mixed with the macadamia fibers (treated and untreated), in proportions of 5 and 10% (wt/wt) using a thermokinetic mixer. Furthermore tensile, flexural and impact specimens (Pure PP and composites) were prepared by an injection molding process and tested for evaluation of mechanical properties. The results showed that the insertion of treated fibers in the PP matrix increased the stiffness of the composites. However, the composites reinforced with untreated fibers presented higher impact energy absorption when compared to composites reinforced with treated fibers.

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Sustainable and scalable natural fiber welded palladium-indium catalysts for nitrate reduction

Cited by 51 publications

References 64 publications

Ultralow Thermal Conductivity in Dual‐Doped n‐Type Bi₂Te₃ Material for Enhanced Thermoelectric Properties

Ultralow Thermal Conductivity in Dual‐Doped n‐Type Bi₂Te₃ Material for Enhanced Thermoelectric Properties

Highly N2-Selective Activated Carbon-Supported Pt-In Catalysts for the Reduction of Nitrites in Water

Mechanical Properties of Polypropylene Composites Reinforced with Macadamia Nutshell Fibers

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Sustainable and scalable natural fiber welded palladium-indium catalysts for nitrate reduction

Cited by 51 publications

References 64 publications

Ultralow Thermal Conductivity in Dual‐Doped n‐Type Bi2Te3 Material for Enhanced Thermoelectric Properties

Ultralow Thermal Conductivity in Dual‐Doped n‐Type Bi2Te3 Material for Enhanced Thermoelectric Properties

Highly N2-Selective Activated Carbon-Supported Pt-In Catalysts for the Reduction of Nitrites in Water

Mechanical Properties of Polypropylene Composites Reinforced with Macadamia Nutshell Fibers

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Ultralow Thermal Conductivity in Dual‐Doped n‐Type Bi₂Te₃ Material for Enhanced Thermoelectric Properties

Ultralow Thermal Conductivity in Dual‐Doped n‐Type Bi₂Te₃ Material for Enhanced Thermoelectric Properties