Ran Yan, Cancan Zhang, Siyu Liu, Xindi Zhang, Chenxin Zhang, Xian-Hua Zhang, Shaolong Wan, Jingdong Lin, Lingtao Liu, Shuai Wang
Boron oxide catalysts are often considered support-insensitive under nominally full-coverage conditions. Here we show that γ-Al2O3 still regulates methane oxidation on B2O3/γ-Al2O3 at surface-saturating B2O3 loading. Engineering alumina basicity yields nearly an order-of-magnitude rate variation while preserving the intrinsic resistance to deep oxidation. Combined in situ spectroscopy and site titration indicate that B2O3 melts under reaction conditions and dynamically exposes basic Al-OH functionality, which underlies the observed promotion. These reaction-driven interfacial dynamics offer a new design handle for tuning nonmetallic oxidation catalysis even under "full-coverage" conditions.