Aside from the acquirement of renewable energy sources the storing of the recovered energy is also of fundamental importance to ensure the uphold of an efficient and reliable coverage of the energy demand in the coming years in the face of rising global primary energy consumption. The thermochemical energy storage is a promising method with big potential to save energy over long periods of time without losses and release it again at will by the use of reversible reactions. In this study, experimental and theoretical investigations of the thermochemical energy storage were performed. On a test bench for thermochemical storage materials in addition to the start-up, calibration and test experiments, the reversible reaction of the hydration and dehydration of magnesium oxide as well as different zeolites were subjected thermogravimetric analyses. Further hydration tests on another reactor and experiments on a pressure reactor were carried out. The measurement results were examined for consistency and the functional capability of the test stand was assessed, together with the identification of sources of errors and possibilities for future improvement. Using the program Dymola, based on the programming language Modelica, a dynamic model of the process of the chemical reaction was created, wherein the reaction kinetics and heat transfer were considered.