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with facilities in the states of Illinois and Idaho, is owned by the United States Government, and operated by the University of Chicago under the provisions of a contract with the Department of Energy. This technical memo is a product of Argonne's Energy Systems (ES) Division. For information on the division's scientific and engineering activities, contact: Director, Energy Systems Division Argonne National Laboratory Argonne. Illinois 60439-481 5 Telephone (630) 252-3724 Presented in this technical memo are preliminary results of ongoing work or work that is more limited in scope and depth than that described in formal reports issued by the ES Division.

Cores removed from the front SCR catalyst show a dark region in the Na-and K-aged samples (Toops)