Phosphorous-doped boron nitride (PBN) was previously confirmed to be an effective metal-free catalyst for the challenging topic of ethylbenzene direct dehydrogenation (DDH) to styrene.Here, the effect of mass transfer factors including the porosity and surface exposure degree of mesoporous-PBN (m-PBN) on its performance over DDH was investigated by control experiments. The central pore size of m-PBN was closely dependent on the thiourea amount and heating rate. The m-PBN with optimal pore size delivered a significantly improved styrene [a] Y.

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