Effect of KCl on the performance of Cu-K-La/γ-Al2O3 catalyst for HCl oxidation

Cu-K-La/γ-Al2O3 catalysts prepared by the incipient wetness impregnation for the catalytic oxidation of HCl to Cl2 at atmospheric pressure were investigated for the effect of KCl on the catalyst performance. Cu-K-La/γ-Al2O3 catalyst with 5 wt% KCl loading showed good activity and stability due to the promotion by KCl. It gave good activity over a wide range of space velocity of the feed gas and conversion of HCl above 85%, and it was nearly unchanged in activity after 100 h reaction at the conditions of 0.1 MPa, 360 °C, space velocity of 450 L/(kg-cat·h), and HCl/O2 molar ratio = 2:1. X-ray diffraction results indicated that Cu, K, and La species were highly dispersed on the surface of the γ-Al2O3 support. H2 temperature-programmed reduction results indicated that the addition of KCl favored the reduction of Cu2+ to Cu+ and improved the activity of the active sites of Cu2+ species for HCl oxidation.

Graphical AbstractAddition of KCl improved the activity of the active sites of Cu2+ species and the stability of Cu-K-La/γ-Al2O3 catalyst for HCl oxidation.Figure optionsDownload as PowerPoint slide