NOVELTY - A pressure swing adsorption apparatus, comprises fuel processor for producing a reformate comprising hydrogen and an impurity, the reformate having fluctuations in pressure and/or flow rate; a conduit or buffer for reducing fluctuations; and a purification unit for removing impurity from reformate to produce hydrogen-enriched reformate, and having adsorbent beds and valve assembly for controlling flow of reformate to adsorbent beds.    USE - The pressure swing adsorbent apparatus is used for producing hydrogen-enriched reformate. Hydrogen is utilized in aerospace to food production to oil and gas production and refining. Hydrogen is used in these industries as a propellant, an atmosphere, a carrier gas, a diluent gas, a fuel component for combustion reactions, a fuel for fuel cells, as well as a reducing agent in numerous chemical reactions and processes. In addition, hydrogen is being considered as an alternative fuel for power generation because it is renewable, abundant, efficient, and unlike other alternatives, produces zero emissions.    ADVANTAGE - The selective adsorption can be carried out in a pressure swing adsorption apparatus where the adsorption period is controlled and adjusted to achieve greater product purity.    DETAILED DESCRIPTION - A pressure swing adsorption apparatus (100) for producing hydrogen-enriched reformate comprises:    (1) a fuel processor (110) for producing a reformate comprising hydrogen and an impurity, the reformate having fluctuations in pressure and/or flow rate;    (2) a conduit or buffer (120) for reducing the fluctuations in pressure and/or flow rate;    (3) a purification unit (140) capable of removing impurity from the reformate to produce a hydrogen-enriched reformate, and having adsorbent beds and a valve assembly capable of selectively controlling a flow of the reformate to one or more of the adsorbent beds; and    (4) a product sensor disposed downstream of the purification unit capable of sensing the hydrogen-enriched reformate and/or a hydrogen-depleted reformate to generate sensed product data, where the valve assembly controls the flow of reformate in response to the sensed product data.    An INDEPENDENT CLAIM is also included for a method for producing a hydrogen-enriched reformate, comprising:    (1) producing a reformate comprising hydrogen and an impurity in a fuel processor, the reformate having fluctuations in pressure and/or flow rate;    (2) reducing the fluctuations in the pressure and/or flow rate;    (3) directing a flow of the reformate through a valve assembly to one or more of adsorbent beds within a purification unit for an adsorption period to remove impurity from the reformate and to produce a hydrogen-enriched reformate;    (4) sensing the hydrogen-enriched reformate or a hydrogen-depleted reformate to produce sensed product data; and    (5) adjusting the adsorption period in response to the sensed product data.    DESCRIPTION OF DRAWING(S) - The figure is a schematic illustration of a fuel processor and a purification unit.    Pressure swing adsorption apparatus (100)    Fuel processor (110)    Conduit or buffer (120)    Compression unit (130)    Compressor (135)    Purification unit (140)    Variable speed motor (141)