Kinetic Analysis of H2S Removal over Mesoporous Cu-Mn Mixed Oxide/SBA-15 and La-Mn Mixed Oxide/KIT-6 Sorbents during Hot Coal Gas Desulfurization Using the Deactivation Kinetics Model

摘要

Kinetic analysis was investigated using the deactivation kinetics model, where the reaction order of each species based on the experimental data was estimated for H2S removal over mesoporous Cu-Mn mixed oxide/SBA-15 and La-Mn mixed oxide/KIT-6 sorbents during hot coal gas desulfurization in a fixed-bed reactor. The reaction orders, rate constants, apparent activation energy (E-a), and deactivation energy (E-d) were calculated as the kinetic parameters. The calculated reaction orders, alpha, beta, and gamma, were 1, 1, and 1 for Cu-Mn mixed oxide/SBA-15 and 0.6, 1.2, and 1 for La-Mn mixed oxide/KIT-6. The obtained E-a and E-d for Cu1Mn9 mixed oxide/SBA-15 were 33.02 and 46.34 kJ mol(-1) and for La3Mn97 mixed oxide/KIT-6 were 48.98 and 56.10 kJ mol(-1), respectively. This model offered the H2S breakthrough curves for the whole duration of the desulfurization reaction, with errors less than 5% between calculated and experimental data.