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A gas adsorption composite a high density adsorbent including a high density layer having a first density of at least 0.3 g/cc; and a low density adsorbent having a low density layer having a second density of less than 0.3 g/cc, wherein the high density adsorbent is in substantially contiguous cont

A gas adsorption composite a high density adsorbent including a high density layer having a first density of at least 0.3 g/cc; and a low density adsorbent having a low density layer having a second density of less than 0.3 g/cc, wherein the high density adsorbent is in substantially contiguous contact with the low density adsorbent and each of the high density adsorbent and the low density adsorbent has an adsorbent surface area of at least 500 m2/g. A pressure swing adsorption process for recovering a product gas from a feed gas, the process including supplying a pressure swing adsorption apparatus including a gas adsorption composite, feeding a feed gas into the pressure swing adsorption apparatus during a feed period not exceeding 100 seconds and recovering the product gas from the pressure swing adsorption apparatus.

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1. A gas adsorption composite comprising:a high density adsorbent comprising a high density layer having a first density of at least 0.3 g/cc; and a low density adsorbent comprising a low density layer having a second density of less than 0.3 g/cc, wherein the high density adsorbent is in a substant

1. A gas adsorption composite comprising:a high density adsorbent comprising a high density layer having a first density of at least 0.3 g/cc; and a low density adsorbent comprising a low density layer having a second density of less than 0.3 g/cc, wherein the high density adsorbent is in a substantially contiguous contact with the low density adsorbent, and each of the high density adsorbent and the low density adsorbent has an adsorbent surface area of at least 500 m2/g. 2. The composite of claim 1, wherein the high density layer has a first air permeability greater than 0 and up to about 0.5 Darcy (0.494×10?12 m2), and the low density adsorbent has a second air permeability of at least 15 Darcy (14,805×10?12 m2), the first air permeability and the second air permeability being measured at atmospheric pressure and ambient temperature.3. The composite of claim 1, wherein the high density adsorbent comprises a plurality of high density layers having an average first density of at least 0.4 g/cc and/or the low density adsorbent comprises a plurality of low density layers having an average second density of less than 0.4 g/cc.4. The composite of claim 3, wherein the high density layers and the low density layers are in a ratio of about 0.25 to about 4.0.5. The composite of claim 1, wherein at least one of the high density layer and the low density layer comprises at least one member selected from the group consisting of activated carbon, zeolites, alumina and silica gel.6. The composite of claim 5, wherein at least one of the high density layer and the low density layer is impregnated with metal salts, and/or modified by oxidation, reduction and/or ion exchange.7. The composite of claim 1, wherein the high density adsorbent and the low density adsorbent are alternating layers.8. The composite of claim 7, wherein said alternating layers form a spirally wound structure.9. The composite of claim 1, wherein the low density layer is about 0.2 to about 2 times thicker than the high density layer.10. The composite of claim 1, wherein the high density layer has a first transfer coefficient of at least 0.5 sec?1, the low density layer has a second mass transfer coefficient of at least 0.5 sec?1, said composite has a composite mass transfer coefficient of at least 0.5 sec?1, and wherein said composite is adapted for use in a cyclic adsorptive/regenerative process.11. A pressure swing adsorption process for recovering a product gas from a feed gas, said process comprising:supplying a pressure swing adsorption apparatus comprising a gas adsorption composite of claim 1; feeding a feed gas into said pressure swing adsorption apparatus during a feed period not exceeding 100 seconds; and recovering said product gas from said pressure swing adsorption apparatus. 12. The process of claim 11, wherein the high density layer has a first transfer coefficient of at least 0.5 sec?1, the low density layer has a second mass transfer coefficient of at least 0.5 sec?1, and said composite has a composite mass transfer coefficient of at least 0.5 sec?1.13. The process of claim 12, wherein the high density layer has a first air permeability of above 0 and up to 0.5 Darcy (0.494×10?12 m2), and the low density adsorbent has a second air permeability of at least 15 Darcy (14.805×10?12 m2), the first air permeability and the second air permeability are measured at atmospheric pressure and ambient temperature.14. The process of claim 12, wherein the high density adsorbent consists of a plurality of high density layers having an average first density of at least 0.4 g/cc and/or the low density adsorbent consists of a plurality of low density layers having an average second density of less than 0.4 g/cc.15. The process of claim 12, wherein at least one of the high density layer and the low density layer comprises at least one member selected from the group consisting of activated carbon, zeolites, alumina, and silica gel.16. The process of claim 12, wherein at least one of the high density layer and the low density layer is modified by impregnation with metal salts, oxidation, reduction and/or ion exchange.17. The process of claim 12, wherein the high density adsorbent and the low density adsorbent are alternating layers.18. The process of claim 17, wherein said alternating layers form a spirally wound structure.19. The process of claim 12, wherein the high density layers and the low density layers are in a ratio of about 0.25 to about 4.0.20. The process of claim 12, wherein the feed period is up to 40 seconds.21. The process of claim 12, wherein the feed period is up to 15 seconds.22. The process of claim 12, wherein the feed period is up to 3 seconds.23. The process of claim 12, wherein said feed gas comprises a mixture of hydrogen and at least one other component selected from the group of air, carbon dioxide, carbon monoxide, hydrocarbon, oxygen, argon, and nitrogen.