Abstract
The reduction of Cu2+ cations supported on a range of Y zeolites, enriched to various levels with different alkalimetal cations, has been investigated. The location of Cu2+ cations within the zeolite framework has been monitored after various stages of thermal treatment and the reduction of the Cu2+ ions in a flowing hydrogen atmosphere has been correlated with such diverse factors as the reduction temperature, reduction time, heating rate and NH3 pretreatment. Cation location has been probed by means of Cs+ back-exchange. Iodometric titrations and Na+ back-exchange techniques have been used to measure the levels of Cu2+ reduction. From the data generated it is shown that the nature of the alkali-metal co-cation strongly influences the degree of Cu2+ reduction. The levels of Cu2+ reduction are compared to those exhibited by Ni2+ ions supported on a range of Y zeolites reduced under the same experimental conditions.
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