NOVELTY - Conversion of product gas involves contacting a carbon-based fuel with at least a conversion catalyst; contacting resulting intermediate gas product with absorbent material to absorb carbon dioxide and form hydrogen-rich gas; extracting the hydrogen-rich gas; regenerating the absorbent material; and repeating the above steps at least 10 times. The absorbent material retains at least 50 mol% theoretical absorption capacity after each repeating step.    USE - The method is used for conversion or carbon-based fuel, e.g. diesel fuel, JP-8 aviation fuel, kerosene, ethanol, gasoline or methane (claimed), to H2-rich product gas.    ADVANTAGE - The method can produce a H2-product gas having high H2 content and low level of carbon oxides. It has high conversion efficiency. The absorbent material maintains high absorption capacity over a number of cycles.    DETAILED DESCRIPTION - Conversion of product gas involves:    (1) providing a carbon-based fuel;    (2) converting the carbon-based fuel to intermediate gas product by contacting the carbon-based fuel with at least a first conversion catalyst;    (3) contacting the intermediate gas product with absorbent material to absorb carbon dioxide (CO2) and form hydrogen (H2)-rich gas, with the absorbent material having a theoretical absorption capacity for CO2;    (4) extracting the H2-rich gas from the contacting step;    (5) regenerating the absorbent material; and    (6) repeating the above steps at least 10 times, where the absorbent material retains at least 50 mol% theoretical absorption capacity after each of the repeating steps.    INDEPENDENT CLAIMS are also included for:    (1) steam-reforming catalyst comprising particulate support structure, and metal dispersed on the support structure, where the reforming catalyst achieves at least 90% of the theoretical thermodynamic conversion of methane to hydrogen at 600 degrees C, H2O:C ratio of 3:1, and gas hour space velocity (GHSV) of 5000 (preferably 12500)/hour in the absence of absorbent for CO2;    (2) particulate composite material comprising first phase comprising absorbent material adapted to absorb CO2, and second phase comprising conversion catalyst selected from a reforming catalyst and water-gas shift catalyst;    (3) a method for fabricating composite particles including absorbent material and catalyst, comprising forming a precursor solution comprising liquid, precursor to absorbent material, and precursor to catalyst phase; atomizing the precursor solution to form precursor droplets; and heating the precursor droplets to remove the liquid and form the composite particles; and    (4) a method for the fabrication of conversion catalyst, comprising forming a precursor solution comprising metal precursor and support precursor; and atomizing the precursor solution to form precursor droplets.    DESCRIPTION OF DRAWING(S) - The figure shows a spray pyrolysis method for the fabrication of calcium oxide particles.