Zero-emission NO₂ capture using divalent metal cation-exchanged zeolites for air purification.

ABSTRACT: The global adoption of hydrogen and biofuels, though central to decarbonization, risks aggravating NO₂ pollution as their combustion drives up NO_x emissions through hotter flames and excess oxygen. Effective ambient NO₂ removal is critical for protecting human health, yet existing adsorbents often release toxic NO, limiting practical deployment. Here, we overcome this grand challenge by developing divalent metal cation-exchanged zeolites that achieve complete NO₂ capture with "zero" NO emission. Exemplified by Ca²⁺- and Mn²⁺-exchanged zeolites, these materials operate under both dry and humid (70% RH) conditions, even at NO₂ concentrations up to 500 ppm. Mechanistic studies reveal that divalent cations, acting as

SUBMITTER: Tao Z 

PROVIDER: S-EPMC12627719 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature