Solid catalysts for environmentally benign synthesis

Török, Béla; Schäfer, Christian; Kokel, Anne

doi:10.1016/b978-0-12-817825-6.00013-6

Cited by 3 publications

(1 citation statement)

References 384 publications

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“…Furthermore, the cation-exchange polymer-based membrane technology is extensively utilized in filtration and electrolyte membrane fuel cells for the production of energy through cleaning waste water simultaneously. Nevertheless, a significant proportion of these entities encounter mechanical and thermal breakdowns when subjected to certain operational circumstances [ 8 ]. Certain materials may exhibit burn, shrinkage, and structural failure when operating under conditions of low relative humidity and high temperatures as a consequence of internal defects such as tearing, cracking, and pinholes.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Cu2+-Driven PTFE-Reinforced Artificial Muscle Polymer Membrane for Water Purification and Energy Harvesting Applications

Avvari,

Sreekanth

2023

Membranes

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Ionic polymer membranes have not yet gained widespread practical application in areas such as water purification and energy harvesting due to their high cost and tendency to swell. The present study involved the fabrication of reinforced textile structures composed of polytetrafluoroethylene (PTFE)-reinforced Nafion membranes coated with non-precious metals, copper and silver, as a surface electrode by applying a chemical decomposition technique. Several mechanical, contact angle measurement and dielectric tests were conducted on membranes to evaluate their mechanical, wettability and conductivity properties. From scanning electron microscopy, it is clear that the formation of surface electrodes with uniform dispersion of metal particles. Scratch test reveals the adhesive strength between the coated metal particles and membrane. The silver-activated copper-coated membrane has a high contact angle of 121°. Thus, the fabricated membranes can have good antibacterial and adsorption properties for water treatment. The copper-coated membrane has a high Young’s modulus of 779 ± 80 MPa and a tensile strength of 29.1 ± 8 MPa, whereas the elongation at break is more for silver-activated copper-coated samples recorded as 158 ± 4%. The viscoelastic behavior of the membranes was analyzed through dynamic mechanical analysis (DMA). A sharp rise in the storage modulus (E′) value of 4.8 × 1010 Pa at ~80 °C at a frequency of 1 Hz on metal surface electrodes signifies an improvement in the strength of the material in comparison to the initial pure membrane. The successful enhancement of conductivity on the membrane surface via chemical deposition on the silver-activated membrane is 1 × 10−4 (S/cm) and holds great potential for facilitating voltage transmission through the tribolayer in the nanogenerators.

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Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Cu2+-Driven PTFE-Reinforced Artificial Muscle Polymer Membrane for Water Purification and Energy Harvesting Applications

Avvari,

Sreekanth

2023

Membranes

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Unlocking glycerol monolaurate potential: A comprehensive review of synthesis pathways, catalyst insights, and optimization strategies

Khandara,

Subbaramaiah,

Gosu

2024

Chemical Engineering Journal

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Activated carbon assisted cobalt catalyst for hydrogen production: synthesis and characterization

Ekinci,

Onat

2024

Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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In this work, a cobalt catalyst supported by activated carbon was used to produce hydrogen through the hydrolysis of sodium borohydride (NaBH4). First, hydrochar was produced from MDF powder by hydrothermal pretreatment. Then, ideal parameters (activator percentage, activation time, baking time, and temperature) for activated carbon production were determined. The best conditions for the synthesis of activated carbon were found to be a 70% activator rate, 24 hours of activation time, 45 minutes of baking time, and 700 ⁰C temperature, according to iodine number measurements. The iodine number was measured as 929 mg/g under optimum conditions. Activated carbon (as a support) produced under optimum conditions was combined with the cobalt catalyst. DT/TGA, FT-IR, SEM, and EDX analyses were used to evaluate the catalyst's structure. Supporting material ratio, NaOH concentration, catalyst amount, and NaBH4 concentration are the variables studied in catalyst synthesis. The trials led to the identification of the optimal catalyst parameters as being 70% support material, 5% NaOH, 40 mg catalyst, and 2% NaBH4 concentration. The hydrogen production rate with the catalyst synthesized in these conditions was determined as 8592.8 ml/g.min. As a result of the hydrolysis reactions carried out at different temperatures, it was determined that the reaction was n. order and the reaction activation energy was 31.19 kJ/mol. Even after the sixth use, 100% efficiency was attained when the catalyst activity was tested repeatedly.

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Solid catalysts for environmentally benign synthesis

Cited by 3 publications

References 384 publications

Fabrication and Characterization of Cu2+-Driven PTFE-Reinforced Artificial Muscle Polymer Membrane for Water Purification and Energy Harvesting Applications

Fabrication and Characterization of Cu2+-Driven PTFE-Reinforced Artificial Muscle Polymer Membrane for Water Purification and Energy Harvesting Applications

Unlocking glycerol monolaurate potential: A comprehensive review of synthesis pathways, catalyst insights, and optimization strategies

Activated carbon assisted cobalt catalyst for hydrogen production: synthesis and characterization

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