Direct　catalytic　selective　oxidation　of　H2S　to　sulfur　at　low　temperature　has　been　drawing　attention.　Molybdenum　carbide　(Mo2C),　in　which　the　excess　occupied　orbitals　provide　more　back-donation　chances　for　the　adsorbents＇　g-orbitals,　shows　activity　in　electrocatalysis,　photocatalysis,　thermocatalysis,　etc.　that　are　comparable　to　those　of　noble　metals.　This　work　reports　for　the　time　the　use　of　Mo2C　and　Mo2C-modified　g-C3N4　for　catalytic　selective　oxidative　desulfurization.　The　density　functional　theory　calculation　indicates　that　Mo2C　facilitates　the　adsorption　of　H2S　molecule　and　the　HS　group.　Furthermore,　the　Mo2C-modified　g-C3N4　shows　a　sulfur　yield　of　as　high　as　99.0%　at　190　degrees　C,　much　higher　than　that　of　g-C3N4　(46.0%).　The　good　stability　of　the　catalyst　was　demonstrated　by　X-ray　diffraction,　Fourier　transform　infrared　spectra,　and　so　on.　Remarkably,　the　H2S　conversion　of　the　Mo2C-modified　g-C3N4　remains　constant　(95.0%)　at　190　degrees　C　for　as　long　as　30　h.　As　a　first　demonstration　using　carbides　in　selective　H2S　oxidation,　this　work　provides　an　opportunity　to　develop　a　novel　class　of　potential　catalysts.