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研究报告

Catalytic performance of copper and cerium oxides-based γ-Al₂O₃ on combustion of toluene

摘要：以γ-Al₂O₃ 为载体,以复合氧化物Cu_xCe_1-_xO₂为活性组分,其中,x=0.1,0.2,0.4,0.6,0.8,通过浸渍法制备了一系列Cu_xCe_1-_xO₂/γ-Al₂O₃催化剂.在固定床反应器中评价了催化剂对甲苯的催化活性,通过XRD、SEM对催化剂进行表征,并运用ICP-MS分析并计算Cu、Ce的摩尔比以及活性组分的负载量.结果表明,在Cu_xCe_1-_xO₂/γ-Al₂O₃催化剂中Cu、Ce摩尔比的实际值与理论值相近,活性组分的负载量在19%以上,而且对甲苯都有较好的低温催化活性,其中当x=0.2时,即Cu_0.2Ce_0.8O₂/γ-Al₂O₃催化剂对甲苯的催化活性最高,其中T₁₀=160 ℃,T₉₀=265 ℃;当甲苯的进口浓度在700~3000 mg·m^-³时,进口浓度对Cu_0.2Ce_0.8O₂/γ-Al₂O₃催化剂的催化活性影响较小,且经过连续80 h的稳定性操作后转化率仍然保持在90%以上.

Abstract：A series of catalysts, copper and cerium oxides-based γ-Al₂O₃, were prepared using Cu_xCe_1-_xO₂ (x=0.1, 0.2, 0.4, 0.6 and 0.8) as the active components and γ-Al₂O₃ as the carrier through an impregnation method. The catalytic activity of the novel catalysts for combustion of toluene was studied using a fixed bed reactor. The catalysts were characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). Meanwhile, the mole ratio of Cu to Ce and active component-supported value were analyzed by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). The results showed that the measured mole ratio of Cu to Ce in the Cu_xCe_1-_xO/γ-Al₂O₃ catalyst was close to the theoretical value while the active component-supported value was higher than 19%. All catalysts showed excellent catalytic performance while the Cu_0.2Ce_0.8O₂/γ-Al₂O₃ catalysts exhibited the highest with T₁₀ at 160 ℃ and T₉₀ at 265 ℃. The results showed that the inlet concentration of toluene (ranged from 700 to 3000 mg·m^-³) had insignificant effect on catalytic activity of the Cu_0.2Ce_0.8O₂/γ-Al₂O₃ catalyst. The Cu_0.2Ce_0.8O₂/γ-Al₂O₃ catalyst appeared to have a significant catalytic ability for combustion of toluene and can achieve over 90% of toluene removal efficiency after 80-hour flow test.