A combination comprising a bed of a particulate copper-containing catalyst bed, a guard bed in the form of shaped units formed from lead carbonate and/or basic lead carbonate particles having an average (by volume) particle size below 100 .mu.m.

 
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> Method and apparatus for removal of contaminants from a hydrogen processor feed stream, as in a fuel cell power plant

> Recovery of purified volatile metal such as lithium from mixed metal vapors
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