The replacement process in of pure sI methane clathrate powders exposed to CO2 have been quantitatively followed by means of neutron diffraction at conditions relevant to sedimentary matrixes of continental margins. The exchange of methane with CO2 within a crystalline lattice of gas hydrates is seen as a two-step process of (1) a fast interfacial reaction (2) followed by much slower diffusion-limited transport.

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