Publications in Scientific Journals:
D. Müller, C. Knoll, G. Gravogl, A. Werner, M. Harasek, R. Miletich, P. Weinberger:
"Lab-scale demonstration of thermochemical energy storage with NH3 and impregnated-loaded zeolites";
ISES Solar World Congress Proceedings,
High energy densities are one key-feature of thermochemical energy storage materials. Among the substance classes featuring the highest energy densities are oxides and carbonates, having both operational temperature profiles between 800 °C - 1200 °C. Comparable high energy contents are provided by the reaction between ammonia and (transition) metal salts, operable in a medium-temperature range between 150 °C - 450 °C. Due to the toxicity of ammonia a closed cycle preventing the release of ammonia to the surrounding environment would be necessary.
Herein, CuSO4 and CuCl2 are investigated in a laboratory scale reactor for their application in thermochemical energy storage with ammonia as reactive gas. In the current setup after 80 seconds peak temperatures of 312 °C and 238 °C respectively were measured. To circumvent the notable volume expansion during the reaction with ammonia, both copper salts were loaded on zeolite 13X, yielding matrix-supported composite materials. Operation of those materials in the laboratory scale reactor under ammonia revealed, that the rapid temperature increase and the high peak temperatures could be retained, simultaneously simplifying the handling of the materials.
copper salts, copper ammoniates, laboratory scale reactor, thermochemical energy storage
"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
Created from the Publication Database of the Vienna University of Technology.