Progress in Understanding Factors Governing the Sodium Manganese Ferrite Thermochemical Cycle

2010 ◽  
Vol 132 (3) ◽  
Author(s):  
C. Alvani ◽  
M. Bellusci ◽  
A. La Barbera ◽  
F. Padella ◽  
L. Seralessandri ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Reactive System ◽  
Thermochemical Cycle ◽  
Manganese Ferrite ◽  
Multistep Reactions

The mixed sodium manganese ferrite thermochemical cycle for sustainable hydrogen production is reviewed. Both the hydrogen production step and the reaction that leads to the regeneration of initial reactants are described as multistep reactions. The chemical cyclability of the reactive system has been demonstrated at 750°C.

Reactive Pellets for Improved Solar Hydrogen Production Based on Sodium Manganese Ferrite Thermochemical Cycle

2008 ◽  
Author(s):  
Carlo Alvani ◽  
Mariangela Bellusci ◽  
Aurelio La Barbera ◽  
Franco Padella ◽  
Marzia Pentimalli ◽  
...  
Keyword(s):  
High Temperature ◽  
Hydrogen Production ◽  
Water Splitting ◽  
Sodium Carbonate ◽  
Production Efficiency ◽  
Manganese Carbonate ◽  
Reactive System ◽  
Thermochemical Cycle ◽  
Manganese Ferrite ◽  
Oxide Mixture

Hydrogen production by water-splitting thermochemical cycle based on manganese ferrite /sodium carbonate reactive system is reported. Two different preparation procedures for manganese ferrite/sodium carbonate mixture were adopted and compared in terms of materials capability to cyclical hydrogen production. According to the first procedure conventionally synthesized manganese ferrite, i. e. high temperature (1250 °C) heating in Ar of carbonate/oxide precursors, was mixed with sodium carbonate. The blend was tested inside a TPD reactor using a cyclical hydrogen production/material regeneration scheme. After few cycles the mixture resulted rapidly passivated and unable to further produce hydrogen. An innovative method that avoids the high temperature synthesis of manganese ferrite is presented. This procedure consists in a set of consecutive thermal treatments of a manganese carbonate/sodium carbonate/iron oxide mixture in different environments (inert, oxidative, reducing) at temperatures not exceeding 750 °C. Such material, whose observed chemical composition consists in manganese ferrite and sodium carbonate in stoichiometric amount, is able to evolve hydrogen during 25 consecutive water-splitting cycles, with a small decrease in cyclical production efficiency.

Reactive Pellets for Improved Solar Hydrogen Production Based on Sodium Manganese Ferrite Thermochemical Cycle

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Carlo Alvani ◽  
Mariangela Bellusci ◽  
Aurelio La Barbera ◽  
Franco Padella ◽  
Marzia Pentimalli ◽  
...  
Keyword(s):  
High Temperature ◽  
Hydrogen Production ◽  
Water Splitting ◽  
Sodium Carbonate ◽  
Production Efficiency ◽  
Manganese Carbonate ◽  
Reactive System ◽  
Thermochemical Cycle ◽  
Manganese Ferrite ◽  
Oxide Mixture

Hydrogen production by water-splitting thermochemical cycle based on manganese ferrite/sodium carbonate reactive system is reported. Two different preparation procedures for manganese ferrite/sodium carbonate mixture were adopted and compared in terms of material capability to cyclical hydrogen production. According to the first procedure, conventionally synthesized manganese ferrite, i.e., high temperature (1250°C) heating in Ar of carbonate/oxide precursors, was mixed with sodium carbonate. The blend was tested inside a temperature programed desorption reactor using a cyclical hydrogen production/material regeneration scheme. After a few cycles, the mixture resulted rapidly passivated and unable to further produce hydrogen. An innovative method that avoids the high temperature synthesis of manganese ferrite is presented. This procedure consists in a set of consecutive thermal treatments of a manganese carbonate/sodium carbonate/iron oxide mixture in different environments (inert, oxidative, and reducing) at temperatures not exceeding 750°C. Such material, whose observed chemical composition consists of manganese ferrite and sodium carbonate in stoichiometric amounts, is able to evolve hydrogen during 25 consecutive water-splitting cycles, with a small decrease in cyclical production efficiency.

Hydrogen Production by the Sodium Manganese Ferrite Thermochemical Cycle—Experimental Rate and Modeling

2014 ◽  
Vol 53 (25) ◽  
pp. 10310-10317 ◽  
Author(s):  
Maria Anna Murmura ◽  
Francesca Varsano ◽  
Franco Padella ◽  
Aurelio La Barbera ◽  
Carlo Alvani ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Thermochemical Cycle ◽  
Manganese Ferrite ◽  
Experimental Rate

Electrophoretic Deposition of Nanoparticles as Electrocatalysts for Electrolysis in the Solar Sulfur Ammonia Hydrogen Production

2015 ◽  
Vol 654 ◽  
pp. 76-82
Author(s):  
Nicole S. Pacheco ◽  
Neil Verma ◽  
Komail Haider ◽  
Jan B. Talbot
Keyword(s):  
Hydrogen Production ◽  
Ammonium Sulfate ◽  
Electrophoretic Deposition ◽  
Electrocatalytic Activity ◽  
Cobalt Ferrite ◽  
Ferrite Nanoparticles ◽  
Thermochemical Cycle ◽  
Cobalt Ferrite Nanoparticles ◽  
Ammonium Sulfite

Cobalt ferrite nanoparticles were deposited using electrophoretic deposition from two different bath chemistries, 90 vol.% water and 10 vol.% isopropanol with hexadecyltrimethlyammonium bromide (CTAB) and 100 % ethanol. The deposits were tested for electrocatalytic activity for the oxidation of ammonium sulfite to ammonium sulfate as part of a solar sulfur ammonia thermochemical cycle to produce hydrogen.

Hydrogen production via a novel two-step solar thermochemical cycle based on non-volatile GeO2

Solar Energy ◽  
2019 ◽  
Vol 179 ◽  
pp. 30-36 ◽  
Author(s):  
Mingkai Fu ◽  
Tianzeng Ma ◽  
Lei Wang ◽  
Shaomeng Dai ◽  
Zheshao Chang ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Thermochemical Cycle ◽  
Solar Thermochemical
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