Abstract
This paper describes the experimental and analytical methods required to study decomposition of zinc sulfate in a simulated solar environment. Experiments were conducted at sample heating rates greater than 2K/s and temperatures in excess of 1400 K in a specially designed thermogravimetric system which employed a 30-kW/sub e//2-kW/sub th/ downward-facing beam, arc-image furnace. The zinc sulfate decomposition took place almost exclusively through the high-temperature ZnSO/sub 4/..beta.. phase under experimental conditions of this study. The kinetic parameters were determined from the thermogravimetric data by using a nonlinear least-squares optimization algorithm. An apparent activation energy, E, between 210 and 250 kJ/mol and an apparent reaction order, n, between 0 and 0.3 were obtained for ..beta..-phase ZnSO/sub 4/ decomposition reaction. The comparison of these results with those from lower temperature and lower heating rate zinc sulfate decomposition tends to suggest a change in reaction mechanism at the high heating rates expected in a concentrated solar environment.
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