Advancing Green Hydrogen Purity with Iron-Based Self-Cleaning Oxygen Carriers in Chemical Looping Hydrogen DOI Open Access
Fabio Blaschke, Biswal Prabhu Prasad, E. Machado

et al.

Catalysts, Journal Year: 2024, Volume and Issue: 14(8), P. 515 - 515

Published: Aug. 9, 2024

Green hydrogen is central to the energy transition, but its production often requires expensive materials and poses environmental risks due perfluorinated substances used in electrolysis. This study introduces a transformative approach green via chemical looping, utilizing an iron-based oxygen carrier with yttrium-stabilized zirconium oxide (YSZ). A significant innovation replacement of Al2O3 SiO2 as inert support pellet, enhancing process efficiency reducing CO2 contamination by minimizing carbon deposition up 700%. The major findings include achieving remarkable purity 99.994% without need for additional purification methods. Fe-YSZ possesses significantly higher pore volume 323 mm³/g surface area 18.3 m²/g, increasing iron matrix 50%, further improving efficiency. catalytic system exhibits unique self-cleaning effect, substantially contamination. Fe-YSZ-SiO2 demonstrated levels below 100 ppm, which particularly noteworthy. research advances our understanding looping mechanisms offers practical, sustainable solutions production, highlighting crucial synergy between pellets carriers. These underscore potential (CLH) technology use efficient environmentally friendly contributing transition cleaner sources.

Language: Английский

Hydrazine Oxidation in Aqueous Solutions II: N4H4 Decomposition DOI
Martin Breza,

A. Gatial

ChemistrySelect, Journal Year: 2024, Volume and Issue: 9(40)

Published: Oct. 1, 2024

Abstract The reaction mechanism for the N 2 H 4 homogeneous oxidation in aqueous solutions is more complex than its heterogeneous electrochemical on electrode surfaces. Homogenous of a mixture non‐labeled ( 14 ) and 15 N‐labeled hydrazine produces N, indicating intermediate existence 6 or intermediates with subsequent hydrogen transfers splitting lateral N─N bonds. To explain key part reaction, structures, thermodynamics, electron characteristics solution are investigated. Unlike , we have not found any spontaneous bond between nitrogens . most probable products disproportionation N─NH which obtained by central nitrogen atoms, so only molecules formed. Additionally, formation 3 also preferred to structures without fissions. N═N HN═NH energetically less advantageous. Cyclo‐N stable, fissions, but their energies indicate vanishing abundance solution, involvement highly improbable. cannot be explained intermediates.

Language: Английский

Citations

0
Constructing Pdo Reinforced Cuo/Al2o3 Mesoporous Nanostructures as Highefficiency Catalysts for Hydrazine Oxidation Reaction (Hzor) DOI
Safia Khan, Ifzan Arshad, Saima Aftab

et al.

Published: Jan. 1, 2024

Language: Английский

Citations

0
Boosting the Hydrogen Evolution Performance of Ultrafine Ruthenium Electrocatalysts by a Hierarchical Phosphide Array Promoter DOI Open Access
Jing Wang, Yuzhe Cao,

Mingyang Wei

et al.

Catalysts, Journal Year: 2024, Volume and Issue: 14(8), P. 491 - 491

Published: July 31, 2024

Tuning the chemical and structural environment of Ru-based nanomaterials is a major challenge for achieving active stable hydrogen evolution reaction (HER) electrocatalysis. Here, we anchored ultrafine Ru nanoparticles (with size ~4.2 nm) on hierarchical Ni2P array (Ru/Ni2P) to enable highly efficient HER. The promoter weakened adsorption proton sites by accepting electrons from nanoparticles. Moreover, endowed catalysts with large surface area open structure. Consequently, as-fabricated Ru/Ni2P electrode displayed low overpotential 57 164 mV at HER current densities 10 50 mA cm−2, respectively, comparable state-of-the-art Pt catalysts. can operate stably 96 h cm−2 without performance degradation. After pairing commercial RuO2 anode, anode catalyzed overall water splitting 1.73 V density which was 0.16 lower than its Ni counterpart. In situ Raman studies further revealed optimized Ru-active promoter, thus enhancing electrocatalytic performance.

Language: Английский

Citations

0
Advancing Green Hydrogen Purity with Iron-Based Self-Cleaning Oxygen Carriers in Chemical Looping Hydrogen DOI Open Access
Fabio Blaschke, Biswal Prabhu Prasad, E. Machado

et al.

Catalysts, Journal Year: 2024, Volume and Issue: 14(8), P. 515 - 515

Published: Aug. 9, 2024

Green hydrogen is central to the energy transition, but its production often requires expensive materials and poses environmental risks due perfluorinated substances used in electrolysis. This study introduces a transformative approach green via chemical looping, utilizing an iron-based oxygen carrier with yttrium-stabilized zirconium oxide (YSZ). A significant innovation replacement of Al2O3 SiO2 as inert support pellet, enhancing process efficiency reducing CO2 contamination by minimizing carbon deposition up 700%. The major findings include achieving remarkable purity 99.994% without need for additional purification methods. Fe-YSZ possesses significantly higher pore volume 323 mm³/g surface area 18.3 m²/g, increasing iron matrix 50%, further improving efficiency. catalytic system exhibits unique self-cleaning effect, substantially contamination. Fe-YSZ-SiO2 demonstrated levels below 100 ppm, which particularly noteworthy. research advances our understanding looping mechanisms offers practical, sustainable solutions production, highlighting crucial synergy between pellets carriers. These underscore potential (CLH) technology use efficient environmentally friendly contributing transition cleaner sources.

Language: Английский

Citations

0