Cu/Co复合氧化物催化降解正庚烷研究

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

摘要:

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。对制备的催化剂进行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。在反应空速15000h-1，氧气浓度10%，温度150-275℃条件下，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碳生成。

Abstract:

A series of copper-cobalt composite oxides were synthesized by co-precipitation with different precipitants and the proportion of Cu/Co. The obtained catalysts were further characterized by XRD, SEM, H2-TPR and O2-TPD. The characterization results indicates that the copper-cobalt catalyst prepared by different precipitants shows significant differences in physical and chemical properties. Meanwhile, 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 15000h-1, oxygen concentration of 10%. The results indicated 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 was durable. The characterization results of XRD and TG implied that no structural change and no carbon deposition.