Abstract
The average metal crystallite size in supported metal catalysts usually increases during use. This increase in average metal crystallite size, i.e. decrease in metal surface area, is one of the causes of catalyst deactivation. For some supported metal catalysts the average metal crystallite size in deactivated catalysts can be decreased by appropriate regeneration procedures. The processes by which increases in metal crystallite sizes occur is referred to as sintering, and processes which result in decreases in metal crystallite size are called redispersion.
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