We　report　here　a　facile　approach　for　the　construction　of　3D　Fe-doped　-Al2O3.　In　this　method,　by　the　addition　of　urea　and　citric　acid　during　synthesis,　hollow　spheres　with　a　multi-modal　porous　structure　can　be　successfully　produced.　The　obtained　Fe-doped　-Al2O3　microspheres　are　about　0.8-1.5　m　in　diameter　with　a　shell　thickness　of　200　nm.　Compared　with　-Al2O3,　the　Fe-doped　-Al2O3　catalysts　exhibit　enhanced　activity　in　the　selective　oxidation　of　H2S.　According　to　the　results　of　systematic　studies,　it　is　inferred　that　both　Lewis　acid　sites　and　chemically　adsorbed　oxygen　at　oxygen　vacancies　have　a　great　influence　on　catalytic　activity.　In　addition,　the　nature　of　active　sites　and　the　reaction　mechanism　for　H2S　selective　oxidation　over　these　catalysts　are　disclosed.