Abstract
A high-pressure thermogravimetric analysis system based on the duPont 951 Thermogravimetric Analyzer and the duPont 990 Thermal Analyzer has been constructed. There are two components in the system, a reactor and a gas feed system. The reactor consists of a stainless steel high-pressure enclosure, which houses the balance mechanism from the duPont 951 TGA, and an externally heated vertical reactor tube. This design provides spatial separation between the housing and the reaction zone to protect the balance mechanism from thermal and chemical attack. The gas feed system provides for blending, feeding, and metering of up to seven different gases. The system is designed to have an operating capability of 60 atm and 1100°C with corrosive gases such as hydrogen and hydrogen sulfide. It was proved to operate successfully with aluminide-coated stainless steel reactor tubes for studies of the calcination of dolomite in CO 2/N 2 atmospheres and sulfidation in H 2S/N 2 mixtures up to 30 atm and 850°C.
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