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Carbon dioxide, water, carbon monoxide and hydrogen are removed from a gas stream such as air or nitrogen by adsorbing water and carbon dioxide on a solid absorbent of alumina, or zeolite and oxiding carbon monoxide over a solid catalyst to carbon dioxide and adsorbing the resulting carbon dioxide a

Carbon dioxide, water, carbon monoxide and hydrogen are removed from a gas stream such as air or nitrogen by adsorbing water and carbon dioxide on a solid absorbent of alumina, or zeolite and oxiding carbon monoxide over a solid catalyst to carbon dioxide and adsorbing the resulting carbon dioxide and chemisorbing the hydrogen on the catalyst, which may be palladium on alumina.

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[ What is claimed is:] [1.] A process for the removal of carbon dioxide, water, carbon monoxide and hydrogen from a gas stream to produce a purified gas stream, comprising:adsorbing water and carbon dioxide on a solid adsorbent, and then converting carbon monoxide to carbon dioxide over a single sol

[ What is claimed is:] [1.] A process for the removal of carbon dioxide, water, carbon monoxide and hydrogen from a gas stream to produce a purified gas stream, comprising:adsorbing water and carbon dioxide on a solid adsorbent, and then converting carbon monoxide to carbon dioxide over a single solid catalyst, adsorbing the carbon dioxide so formed onto the same catalyst and chemisorbing H.sub.2 onto the same catalyst, wherein said catalyst is a precious metal supported on a support having a zpc (zero point charge) of greater than 8.0.