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Title: Thermochemical cycles for energy storage: Thermal decomposition of ZnCO sub 4 systems

Abstract

The overall objective of our research has been to develop thermochemical cycles that can be used for energy storage. A specific cycle involving ammonium hydrogen sulfate (NH{sub 4}HSO{sub 4}) has been proposed. Each reaction in the proposed cycle has been examined experimentally. Emphasis has been placed on the basic chemistry of these reactions. In the concluding phase of this research, reported herein, we have shown that when NH{sub 4}HSO{sub 4} is mixed with ZnO and decomposed, the resulting products can be released stepwise (H{sub 2}A{sub (g)} at {approximately}163{degrees}C, NH{sub 3(g)} at 365--418{degrees}C, and a mixture of SO{sub 2(g)} and SO{sub 3(g)} at {approximately}900{degrees}C) and separated by controlling the reaction temperature. Side reactions do not appear to be significant and the respective yields are high as would be required for the successful use of this energy storage reaction in the proposed cycle. Thermodynamic, kinetic, and other reaction parameters have been measured for the various steps of the reaction. Finally we have completed a detailed investigation of one particular reaction: the thermal decomposition of zinc sulfate (ZnSO{sub 4}). We have demonstrated that this reaction can be accelerated and the temperature required reduced by the addition of excess ZnO, V{sub 2}A{sub 5} andmore » possibly other metal oxides.« less

Authors:
 [1]
  1. Houston Univ., TX (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab., Golden, CO (United States); Houston Univ., TX (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
5346223
Report Number(s):
NREL/TP-253-4279
ON: DE91002144
DOE Contract Number:  
AC02-83CH10093
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 14 SOLAR ENERGY; AMMONIUM COMPOUNDS; CHEMICAL REACTION KINETICS; THERMOCHEMICAL HEAT STORAGE; ZINC SULFATES; DECOMPOSITION; ENERGY STORAGE; LITHIUM SULFATES; MIXTURES; PROGRESS REPORT; SOLUBILITY; VANADIUM OXIDES; ZINC OXIDES; ALKALI METAL COMPOUNDS; CHALCOGENIDES; CHEMICAL REACTIONS; DISPERSIONS; DOCUMENT TYPES; HEAT STORAGE; KINETICS; LITHIUM COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; REACTION KINETICS; STORAGE; SULFATES; SULFUR COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; VANADIUM COMPOUNDS; ZINC COMPOUNDS; 250800* - Energy Storage- Chemical; 142000 - Solar Energy- Heat Storage- (1980-)

Citation Formats

Wentworth, W E. Thermochemical cycles for energy storage: Thermal decomposition of ZnCO sub 4 systems. United States: N. p., 1992. Web. doi:10.2172/5346223.
Wentworth, W E. Thermochemical cycles for energy storage: Thermal decomposition of ZnCO sub 4 systems. United States. https://doi.org/10.2172/5346223
Wentworth, W E. 1992. "Thermochemical cycles for energy storage: Thermal decomposition of ZnCO sub 4 systems". United States. https://doi.org/10.2172/5346223. https://www.osti.gov/servlets/purl/5346223.
@article{osti_5346223,
title = {Thermochemical cycles for energy storage: Thermal decomposition of ZnCO sub 4 systems},
author = {Wentworth, W E},
abstractNote = {The overall objective of our research has been to develop thermochemical cycles that can be used for energy storage. A specific cycle involving ammonium hydrogen sulfate (NH{sub 4}HSO{sub 4}) has been proposed. Each reaction in the proposed cycle has been examined experimentally. Emphasis has been placed on the basic chemistry of these reactions. In the concluding phase of this research, reported herein, we have shown that when NH{sub 4}HSO{sub 4} is mixed with ZnO and decomposed, the resulting products can be released stepwise (H{sub 2}A{sub (g)} at {approximately}163{degrees}C, NH{sub 3(g)} at 365--418{degrees}C, and a mixture of SO{sub 2(g)} and SO{sub 3(g)} at {approximately}900{degrees}C) and separated by controlling the reaction temperature. Side reactions do not appear to be significant and the respective yields are high as would be required for the successful use of this energy storage reaction in the proposed cycle. Thermodynamic, kinetic, and other reaction parameters have been measured for the various steps of the reaction. Finally we have completed a detailed investigation of one particular reaction: the thermal decomposition of zinc sulfate (ZnSO{sub 4}). We have demonstrated that this reaction can be accelerated and the temperature required reduced by the addition of excess ZnO, V{sub 2}A{sub 5} and possibly other metal oxides.},
doi = {10.2172/5346223},
url = {https://www.osti.gov/biblio/5346223}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {4}
}