CuO含量对yCuO/Cu_xCe_(1-x)O_δ催化剂脱除微量CO性能的影响

Influences of CuO Content on yCuO /Cu_xCe_(1-x)O_δ Catalysts in Deep Removal of Trace Amount of CO

采用柠檬酸络合-浸渍相结合的制备方法,通过XRD、BET、H2-TPR研究了载体掺杂Cu O含量(x值)、表面负载Cu O含量(y值)对y Cu O/CuxCe1-xOδ催化剂CO催化氧化性能的影响。结果表明,载体中掺杂的Cu O能与Ce O2产生协同作用,有利于负载的Cu O在载体表面均匀分散,提高氧化-还原性能,提升催化活性。采用正交实验设计,经DPS(Data Process System)软件对Cu O含量进行逐步回归优化,得到16.4%Cu O/Cu0.05Ce0.95Oδ催化剂具有较优的CO催化氧化性能,在脱除温度50℃、压力3.0 MPa、液相空速8 h-1的条件下,可将液相丙烯中微量CO从1.0×10-5脱除低至3.0×10-8,达到聚合级烯烃对CO脱除深度的要求,连续反应1 400 min,稳定性能良好。

A serious of y CuO / CuxCe1-xOδcatalysts were prepared by combinations of citric acid sol-gel method and impregnation method. The influences of CuO content in support（ the x） and CuO loading（ the y） on the catalytic performance in CO oxidation were investigated by means of XRD,BET and H2-TPR techniques. The results show that the copper entering the cerium oxide crystal lattice could act synergistically to promote the homogeneous dispersion of copper on support and enhance reducibility and catalytic activity. The orthogonal experimental design was used to optimize the CuO contents and relevant data were processed by the DPS（ Data Process System） software. The results indicate that the16. 4% CuO / Cu0. 05Ce0. 95Oδcatalyst exhibited the best catalytic performance,and that,under the conditions of 50 ℃,3. 0 MPa and 8 h-1,it could remove the CO in liquid propylene from 1. 0 × 10-5to 3. 0 × 10-8with good stability of 1 400 min.