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Received f o r review March 8, 1989 Revised manuscript received October 30, 1989 Accepted November 22, 1989
Reductive Decomposition of Calcium Sulfate with Carbon Monoxide: Reaction Mechanism Jae Seung Oh and T. D. Wheelock" Chemical Engineering D e p a r t m e n t and Iowa S t a t e Mining and Mineral Resources Research I n s t i t u t e , Iowa S t a t e University, A m e s , Iowa 5001 1
When CaS04 was treated with a mixture of CO, COz, SOz, and Nzat 1150 "C in thermogravimetric analysis equipment, various reaction stages were identified, and the final product distribution was found to depend on the reducing potential (Pco/PcoJof the gases. At low reducing potentials (_ 8.3 > 5 > 3. Supported nickel catalysts find widespread application in many important industrial processes such as hydrogenation of unsaturated organics, steam reforming, and methanation of synthesis gas (Mustard and Bartholomew, 1981). Three of the most important aspects of the practical use of a heterogeneous catalyst are its activity, selectivity, 0888-5885/90/2629-0550$02.50/0
and stability. In many processes, catalyst deactivation is originated by two or more simultaneous causes such as fouling by coke; poisoning by metals, sulfur, or nitrogen compounds; sintering; and loss of active matter (Corella and Monzon, 1988). For example, deactivation of the catalyst through the settling of carbonaceous residues poses C 1990 American Chemical Society
