Vinyloxy radicals unveiled as critical intermediates in Ni/La₂O₃-catalyzed ethanol steam reforming for hydrogen production.

ABSTRACT: Ethanol steam reforming (ESR) offers a sustainable route for hydrogen production, yet its complex reaction network and elusive intermediates hinder catalyst optimization. Here, we identify the vinyloxy radical (CH₂CHO) as the critical chain-carrying intermediate in ESR over Ni/La₂O₃ catalysts, challenging the conventional view of acetyl radical (CH₃CO) dominance. Through in situ synchrotron vacuum ultraviolet photoionization mass spectrometry with molecular beam sampling (SVUV-PI-MBMS), combined with density functional theory (DFT) calculations and microkinetic modeling, the dynamic speciation of gas-phase radicals and stable products are resolved across 473-1073 K. Experimental results reveal CH₂CHO as the predominant intermediate, ab

SUBMITTER: Xiong Z 

PROVIDER: S-EPMC12800219 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature