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And a fraction of desorbed NH3 at 300 to 800?? C. to the total desorption of NH3 (desorption at 100 to 800?? C.) is determined.The catalyst support used in manufacturing process A mentioned above is a support in which the fraction of desorbed NH3 at 300 to 800?? C. to the total desorption of NH3 is not more than 80%, preferably not more than 70%, and more preferably not more than 60% in the above
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