Rate Coefficients and Branching Ratios for the Reaction of the OH Radical with Formic Acid under Low-Temperature Combustion Conditions and the Fate of the HOCO Product.

ABSTRACT: Formic acid (FA, HC(O)OH) is of interest as an e-fuel and hydrogen carrier, as well as a significant component of atmospheric acidification. Reaction with the OH radical is a major removal process for FA. We have measured the overall rate coefficient, k₁, for the reaction of OH and FA over the temperature range of 300-850 K using laser flash photolysis to generate OH and monitoring the disappearance of OH under pseudo-first-order conditions using laser-induced fluorescence. The rate coefficient can be parameterized as k₁(T) = 9.8 × 10^-15 × (T/298 K)^5.1 × exp(-14200/RT) cm³ molecule^-1 s^-1 where we estimate that the uncertainty increases from ∼ ±20% in the range 300-600 K to ±50% a

SUBMITTER: Blitz MA 

PROVIDER: S-EPMC12278225 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature