Cu/Co复合氧化物催化降解正庚烷

Catalytic Degradation of n-Heptane over Cu/Co Composite Oxides

采用不同沉淀剂及Cu/Co比例,以共沉淀法制备了系列Cu/Co复合氧化物催化剂。对催化剂进行了XRD、SEM、H2-TPR和O2-TPD表征,探究了不同沉淀剂对催化剂物理化学性质的影响,结果表明,以氨水为沉淀剂制备的催化剂氧化还原性较强且具有更多的化学吸附氧。当反应空速15 000 h^-1,氧气体积分数10%,温度150-275℃时,在固定床连续反应器-气相色谱在线检测装置上,考察了Cu/Co催化剂对正庚烷的催化燃烧降解活性,结果表明：Cu1Co4催化剂[n（Cu）∶n（Co）=1∶4]活性最优,温度为185.61℃时其对正庚烷转化率达90%。Cu1Co4寿命实验结果表明：其稳定性良好;XRD表征及热重分析（TG）结果表明：反应前后催化剂结构稳定且表面无积炭生成。

A series of copper-cobalt composite oxides with various mole proportion of Cu/Co were synthesized by co-precipitation in the presence of different precipitants.Obtained catalysts were characterized by XRD,SEM,H2-TPR and O2-TPD.The effects of different precipitants on the physical and chemical properties of catalyst were also investigated.The results indicated that the catalysts using ammonia as precipitant exhibited stronger redox properties and had more chemisorption oxygen.The catalytic activity of the catalysts for oxidative degradation of n-heptane was investigated in a continuous fixed bed reactor with GHSV of 15 000 h^-1,oxygen concentration of 10%（volume fraction） at 150 -275℃.It was found that Cu1Co4 catalyst[n（Cu） ∶ n（Co） = 1∶4]performed the best activity in the case of reaction temperature of 185.61 ℃ and the conversion of n-heptane was 90%.Moreover,the stability test showed that Cu1Co4 had good stability.The characterization results of XRD and TG implied that Cu1Co4 was stable before and after reaction,and there was no carbon deposition formation on its surface.