Sulfur-iodine cycle water

The sulfur-iodine thermochemical water-splitting cycle (S-1 cycle) developed for hydrogen production from water is fundamentally based on the following three chemical reactions (Wang, 2007) ... 

Norman JH, Mysels KJ, Sharp R, Williamson D (1982) Studies of the sulfur-iodine thermochemical water-splitting cycle. Int J Hydrogen Energy 7 545-556... 

O Keefe, D., et al. (1982), Preliminary Results from Bench Scale Testing of a Sulfur Iodine Thermochemical Water Splitting Cycle , Int. J. Hydrogen Energy, 7, 381-392. 

Norman, J. H. Mysels, K. J. O Keefe, D. R. Stowell, S. A. Williamson, D. G., "Chemical Studies on the General Atomic Sulfur-Iodine Thermochemical Water-Splitting Cycle," paper presented at the Second World Hydrogen Energy Conference, Zurich, Switzerland, August 1978. 

D.R. O keefe, C. Allen, G. Besenbruch, L. Brown, J. Norman, and R. Sharp, Preliminary results from bench-scale testing of a sulfur-iodine thermochemical water-splitting cycle . International Journal of Hydrogen Energy, 7, 381-392 (2000). 

Thermochemical cycles are a solution to this problem as they split water using special catalysts and heat As an example, the sulfur-iodine-cycle will briefly be discussed. When heat is added, the sulfuric acid is split into sulfur dioxide, water and oxygen. In a second step, heat is added again to produce hydrogen iodide and... 

Sulfur iodine thermochemical water-splitting cycle. 

The sulfur-iodine cycle is a series of thermo-chemical processes used to obtain hydrogen. It consists of three chemical reactions whose net reactant is water and whose net products are hydrogen and oxygen. 

Direct water splitting chemical cycles (Sulfur Iodine)... 

The sulfur-iodine thermo chemical water-splitting cycle continues to represent a promising approach to the production of hydrogen utilizing an entirely thermal energy source. Another significant step toward its viability has been taken by the successful closure of the cycle in this laboratory demonstration. 

A recent screening of several hundred possible reactions (Besenbruch et al 2001) has identified two candidate thermochemical cycles for hydrogen production from water (i.e., cycles that enable chemical reactions to take place at high temperatures) with high potential for efficiency and practical applicability to nuclear heat sources. These are the sulfur-iodine (S-I) and calcium-bromine-iron (Ca-Br) cycles. Also, Argonne National Laboratory (ANL) has identified the copper-chlorine (Cu-Cl) thermochemical cycle for this purpose (Doctor et al 2002). A hybrid sulfur-based process that does not require iodine but has a single electrochemical... 

The sulfur-iodine (S-I) cycle is a thermochemical water-splitting process that utilizes thermal energy from a high-temperature heat source to produce hydrogen (H2). It is comprised of three coupled chemical reactions, as shown in figure 4.1. First, the central low-temperature Bunsen reaction (Section I) is employed to produce two... 

Several hundred potential thermochemical reactions exist. NAE (2004) state that the two most likely cycles for the production of hydrogen from water are the sulfur-iodine (S-I)... 

These thermochemical water-splitting processes have been explored extensively in the 1970s and some 25 key cycles have been identified (Besenbruch, 1982 Brown et al., 2003). The sulfur-iodine (SI) cycle is currently the leading candidate. The SI cycle consists of three chemical processes expressed as sections ... 

Thermochemical Water Splitting by Iodine-Sulfur Cycle.137... 

Kubo, S. et al., A demonstration study on a closed-cycle hydrogen production by thermochemical water-splitting Iodine-Sulfur process, Nucl. Eng. Des., 233, 347, 2004. 

Kubo, S. et al., Corrosion test on structural materials for iodine-sulfur thermochemical water splitting cycle, in Proc. 2nd Topical Conf. on Fuel Cell Tech., AIChE 2003 Spring National Meeting, New Orleans, March 30-April 3, 2003. 

Kubo, S., et al (2004), A Demonstration Study on a Closed-cycle Hydrogen Production by the Thermochemical Water-splitting Iodine-sulfur Process , Nuclear Engineering and Design, 233, 347-354. 

Kubo, S. et al.. Corrosion Test on Strnctnral Materials for Iodine-Sulfur Thermochemical Water-Splitting Cycle, paper presented at the Proceedings of the 2nd Topical Conference on Fuel Cell Technology, AlChE 2003 Spring National Meeting, 2003. 

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