A RADIOISOTOPE FLOW-CIRCULATION TRACER METHOD FOR DETERMINATION OF SULFUR UPTAKE AND EXCHANGE


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Abstract

A combined radioactive flow-circulation tracer method has been developed and applied to a CoMo/Al2O3 catalyst for measurement of sulfur uptakes and of catalyst - gas phase sulfur exchange in the H2S partial pressure range of 2–47 kPa and the temperature range of 373–673 K. Equilibrium between gas-phase and catalyst sulfur species was rapidly achieved. A substantial part of the sulfur uptake was retained as adsorbed (reversible) sulfur species. The exchange of sulfur increased with increase in temperature up to 573 K and in H2S partial pressure up to 4 kPa.

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