NOVELTY - Gas-phase photocatalytic production of hydrogen involves preparing cadmium sulfide-based semiconducting photocatalyst, mixing photocatalyst with vermiculite material (2), packing photocatalyst immobilized on vermiculate material inside packed bed tubular reactor (1), sweeping reactor with nitrogen gas, illuminating with visible light source (3), allowing mixture of hydrogen sulfide and nitrogen (4) to flow through the reactor in presence of visible light source for splitting of hydrogen sulfide, collecting hydrogen and nitrogen gas (5) produced in jar, and quantifying hydrogen.    USE - Gas-phase photocatalytic production of hydrogen for use as fuel for internal combustion engines and for generation of electric energy in fuel cells, from hydrogen sulfide generated from sewage treatment plant, petroleum refining industry, boiler, furnace and sulfur recovery unit.    ADVANTAGE - The method provides hydrogen with reduced energy consumption and hydrogen conversion rate of 96% using highly active photocatalyst.    DETAILED DESCRIPTION - Gas-phase photocatalytic production of hydrogen involves preparing cadmium sulfide-based semiconducting photocatalyst, mixing cadmium sulfide-based semiconducting photocatalyst with vermiculite material, drying in hot air oven, packing cadmium sulfide-based semiconducting photocatalyst immobilized on vermiculate material inside the packed bed tubular reactor to obtain porous packing material, sweeping reactor with nitrogen gas to flush out air completely, before irradiation, illuminating the packed bed tubular reactor with visible light source to produce light photons, allowing the gas mixture of hydrogen sulfide and nitrogen to flow continuously through the packed bed tubular reactor in presence of photocatalyst-coated vermiculate material and visible light source for effective splitting of hydrogen sulfide, eliminating unreacted hydrogen sulfide by allowing the outlet gas into sodium hydroxide solution, during the reaction, measuring and collecting hydrogen and nitrogen gas produced in inverted measuring jar, and quantifying hydrogen using gas chromatograph.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of packed bed tubular reactor.    Packed bed tubular reactor (1)    Vermiculite material (2)    Visible light source (3)    Hydrogen sulfide and nitrogen (4)    Hydrogen and nitrogen gas (5)