Promotion of ZrO₂ on RuO₂/Al₂O₃ Catalyst for HCl Catalytic Oxidation: Effect of High Temperature Holding in Nitrogen Atmosphere

Abstract

Catalytic oxidation of HCl to Cl 2 to realize chlorine recycling is an inevitable requirement for the sustainable development of chlorine-related industries. In this paper, RuO 2 /ZrO 2 − Al 2 O 3 was prepared by loading ZrO 2 and RuO 2 successively on the commercial Al 2 O 3 carrier, followed by further high temperature holding in nitrogen. The XRD, XPS, H 2 -TPR, and TEM results show that after high temperature holding, both the morphology of RuO 2 and ZrO 2 transformed from three-dimensional nanoparticles to two-dimensional plates on Al 2 O 3 . As a result, the dispersity of Ru was obviously improved, RuO 2 (110) crystal plane was fully exposed, and Zr atoms entered the RuO 2 lattice to form Ru x Zr y O z species which changed the lattice parameters of RuO 2 , finally leading to the obviously improved activity and stability in HCl catalytic oxidation reaction.