CuO含量对yCuO/CuxCe1-xOδ催化剂脱除痕量CO性能影响

The Influences of CuO Content on yCuO/CuxCe1-xOδ Catalysts in Deep Removal of Trace Amount of CO

摘要:

采用柠檬酸络合-浸渍相结合的方法制备yCuO/CuxCe1-xOδ催化剂，通过XRD、BET、H2-TPR等手段研究了载体掺杂CuO含量（x值）、表面负载CuO含量（y值）对yCuO/CuxCe1-xOδ催化剂催化氧化CO性能的影响。结果表明，载体中掺杂的CuO能与CeO2产生协同作用，有利于负载的CuO在载体表面均匀分散，促进氧化-还原性能的提高，提升CO催化氧化活性。采用正交试验法，经DPS（Data Process System）软件对CuO含量进行逐步回归优化，优化得到16.40 %CuO/Cu0.05Ce0.95Oδ催化剂具有较优的催化氧化CO性能，该催化剂在50 ℃、3.0 MPa的工况条件下，可将液相丙烯中微量CO从1.0 × 10-5（φ，体积分数）降至3.0 × 10-8（φ），达到聚合级烯烃对CO脱除深度的要求，连续反应1400 min，稳定性良好。

Abstract:

A serious of yCuO/CuxCe1-xOδ catalysts 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 characterized by XRD, BET and H2-TPR techniques. The results showed that the copper entering into the cerium oxide crystal lattice could act synergistically to promote the dispersition of copper on support, reducibility and catalytic activity. The orthogonal experimental design was used to optimize the CuO contents and relevant data was processed by the DPS (Data Process System) software. The results indicated that the 16.40%(w)CuO/Cu0.05Ce0.95Oδ catalyst exhibited the best catalytic performance, and under the conditions of 50 ℃ and 3.0 MPa, it could remove the CO in liquid propylene from 1.0 × 10-5(φ) to 3.0 × 10-8(φ) with good stability of 1400 min.