Heterogeneous Reaction of SO₂ on Manganese Oxides: the Effect of Crystal Structure and Relative Humidity.

ABSTRACT: Manganese oxides from anthropogenic sources can promote the formation of sulfate through catalytic oxidation of SO₂. In this study, the kinetics of SO₂ reactions on MnO₂ with different morphologies (α, β, γ and δ) was investigated using flow tube reactor and in situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). Under dry conditions, the reactivity towards SO₂ uptake was highest on δ-MnO₂ but lowest on β-MnO₂, with a geometric uptake coefficient (γ_obs) of (2.42 ± 0.13) ×10^-2 and a corrected uptake coefficient (γ_c) of (1.48 ± 0.21) ×10^-6 for the former while γ_obs of (3.35 ± 0.43) ×10^-3 and γ_c of (7.46 ± 2.97) ×10^-7 f

SUBMITTER: Yang W 

PROVIDER: S-EPMC5495761 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature