Effect of Cr-doping on CuCl2-KCl-CeO2/γ-Al2O3 catalysts for ethane oxychlorination.

Chromium-doped CuCl 2 –KCl–CeO 2 –Cr x /γ-Al 2 O 3 with different content (Cr 0, 1, 3, 5, 7 and 9 wt.%) were synthesized by co-impregnation method and characterized by XRD, BET, SEM, H 2 -TPR and XPS techniques. It is found that the addition of chromium species increases a large amount of capping oxygen species on the catalysts surface, reduces the reduction activation energy of Cu(II) → Cu(I) process efficiently, and accelerates the transition of redox group Cu(II)/Cu(I). Meanwhile, the addition of chromium species also affects the crystal size of CeO 2 on the surface. The best catalyst is CuKCeCr 3 with Cr (3 wt.%), which exhibited highest conversion of C 2 H 6 (97.8%) and best selectivity to C 2 H 3 Cl (68.2%). [ABSTRACT FROM AUTHOR]