Methanol　conversion　to　high　value-added　dimethyl　ether　(DME)　and　formaldehyde　(FA)　are　important　chemical　reactions,　commercially　catalyzed　by　metal　oxide　or　noble　metal　catalysts　that　are　environmentally　unfriendly　and　high　cost.　Borocarbonitride　(BCN),　as　a　new　metal-free　material,　holds　acid　sites　and　multiple　oxidative　dehydrogenation　(ODH)　sites,　which　shows　powerful　potential　in　methanol　conversion　reactions.　Herein,　a　two-dimensional　BCN　nanosheet　material　was　prepared　through　polymerization　and　subsequent　pyrolysis,　demonstrating　remarkable　reaction　kinetics　and　high　catalytic　efficiency　in　methanol　conversion　reaction.　Kinetic　measurements　and　structural　characterizations　unraveled　that　the　carboxyl　([sbnd]COOH)　was　active　site　of　methanol　intermolecular　dehydration　to　DME,　and　the　carbonyl　([sbnd]C[dbnd]O)　and　boron　hydroxyl　([sbnd]B[sbnd]OH)　groups　were　active　sites　of　ODH　of　methanol　to　FA.　Additionally,　the　studies　indicated　that　the　C[sbnd]H　bond　dissociation　of　methanol　was　rate-determining　step　of　ODH　reaction,　while　the　both　C[sbnd]H　and　O[sbnd]H　bond　activations　had　profound　effect　for　dehydration　reaction.　©　2025