Ce_αMn_1-αO₂ catalysts supported over γ-Al₂O₃ prepared by modified redox-coprecipitation methods for n-hexane combustion

A series of Ce_αMn_1-αO₂ catalysts supported on γ-alumina with various molar concentrations of Ce (α, from 0 to 0.90) was synthesized by coprecipitation, applying two different precipitating agents, namely, sodium hydroxide (method 1) and sodium carbonate (method 2), with the use of sodium permanganate as a redox agent for precipitation. XRD profiles of the supported samples revealed the predominant abundance of a typical fluorite crystalline structure. TPR thermograms of supported samples were displaced towards lower temperatures with increasing Mn concentration, in contrast with the bulk samples. The supported Ce-Mn samples exhibited a greater performance in n-hexane elimination than did the corresponding simple oxides. The sample Ce_0.33Mn_0.67O₂ obtained by method 2 presented the best activity, probably due to the enrichment of Ce⁴⁺, Mn³⁺ and Mn⁴⁺ surface species, an excess of superficial oxygen species and an easy reducibility as well as the lowest apparent activation energy.

Keywords:
VOC; n-hexane; Ce-Mn; modified-precipitation; alumina