Temperature dependence of isotopic fractionation in the CO₂ -O₂ isotope exchange reaction.

ABSTRACT:

Rationale

Oxygen isotope exchange between O₂ and CO₂ in the presence of heated platinum (Pt) is an established technique for determining the δ¹⁷ O value of CO₂ . However, there is not yet a consensus on the associated fractionation factors at the steady state.

Methods

We determined experimentally the steady-state α¹⁷ and α¹⁸ fractionation factors for Pt-catalyzed CO₂ -O₂ oxygen isotope exchange at temperatures ranging from 500 to 1200°C. For comparison, the theoretical α¹⁸ equilibrium exchange values reported by Richet et al. (1997) have been updated using the direct sum method for CO₂ and the corresponding α¹⁷ values were determined. Finally, we examined

SUBMITTER: Adnew GA 

PROVIDER: S-EPMC9285609 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature