Analysis of Chemical Reaction in the Voids of Cokes Using NMR Gas Imaging

Abstract

The pore structure is very critical and sensitive to react with CO₂ in the case of cokes. But it is very difficult to detect the pore structure of cokes with nondestructive and high resolution because conventional porosimeter method can't detect macro pore (over 400 μm), and at the same time with destructive. We are at first demonstrating 3D-SPRITE imaging to detect the pore structure using SF₄ gas, before and after CO₂ reaction, (over 1 μm) with non destructive and the same pores, and then clarify the reaction mechanism. We found that the reaction rate of the cokes with CO₂ depends on the pore size and the critical pore size is over 100 μm.