RuCeTi催化剂制备及催化氧化氯苯

Preparation of RuCeTi catalyst and catalytic oxidation of chlorobenzene

通过溶胶凝胶法制备具有丰富强酸位点的催化剂载体(CeTi),使用还原剂并调控化学还原过程将Ru负载于CeTi载体上形成RuCeTi催化剂用于氯苯(CB)的催化氧化.XRD、HRTEM、XPS、H_(2)-TPR以及In-situ DRIFTS等表征结果表明,Ru与CeO_(2)之间的相互作用提高了Ru物种的价态,导致RuO_(2)具有较强的氧化还原能力,为氯苯的深度氧化提供了动力;CeTi载体丰富的强酸位点为CB提供了吸附位点.活性测试显示RuCeTi在1000×10^(-6)浓度CB中CO_(2)选择性为98%,持续测试24h而不失活,表明活性氧和酸性位协同使得RuCeTi具有优越的CO_(2)选择性和催化稳定性.

In this paper,a catalyst support(CeTi)with abundant strong acidic sites was prepared by sol-gel method,and Ru was loaded on to form a RuCeTi catalyst by chemical reduction process using a certain reductant.And that was used for the catalytic oxidation of chlorobenzene(CB).With the help of characterizations like XRD,HRTEM,XPS,H_(2)-TPR,and in-situ DRIFTS,it showed that the interaction between Ru and CeO_(2)increased the valence state of Ru species,leading to the promotion of redox ability of RuO_(2)and the deep oxidation of chlorobenzene.Further the abundant strong acidic sites of the CeTi support provided the adsorption sites for CB.The activity tests showed that the CO_(2)selectivity and durability of RuCeTi were significantly enhanced,with a 98%of selectivity and 24h on-stream test at 1000×10^(-6)of CB concentration without deactivation.And that could be derived from the synergistic combination of reactive oxygen species and acidic sites.