High Temperature Calorimeter for the Study of Active Site Distribution on Carbon Catalyst Supports

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A high-temperature differential microcalorimeter for the study of gas adsorption on high-surface-area materials is designed and constructed. The system is designed to operate at temperature up to 625> K, using special materials for this propose. For operation below 450> K, the pressure-gauge heads will be inside the controlled-temperature region, as with present near-ambient designs; for operation in the "high- temperature" region (450-625> K), the system can be reconfigured to place the pressure gauges outside the high- temperature zone. The system will be used in combination with catalytic tests to correlate carbon surface chemistry with the catalytic behavior of carbon-supported metal catalysts, including iron-containing bimetallics. It will also be used in studies of diamond powder and of nanoparticles of silicon nitride.