CuCeO^(x)催化剂的制备及其催化氧化对二甲苯的研究

Preparation of CuCeO^(x)catalyst and study on its use in catalytic oxidation of p-xylene

采用氨水沉淀法合成了铜铈氧化物催化剂,在固定床反应器中考察了Cu-Ce摩尔比、煅烧温度对铜铈氧化物催化剂催化降解对二甲苯效果的影响。通过XRD、SEM、H_(2)-TPR表征了催化剂的理化性质。结果表明,Cu_(1)Ce_(3)-550催化剂具有分布均一的纳米颗粒和孔道结构,形成Cu-Ce固溶体,拥有最优的低温还原性。Cu-Ce摩尔比为1∶3、煅烧温度为550℃下制备的催化剂Cu_(1)Ce_(3)-550,在空速为15000 h^(-1)、对二甲苯质量浓度为2400 mg/m^(3)条件下,表现出最优的催化性能。

Copper-cerium oxides catalyst is synthesized via ammonia precipitation method.The influences of different Cu-Ce molar ratios and calcination temperatures on the catalytic effect of CuCe oxide catalyst for degradation of xylene are evaluated in a fixed-bed reactor.The physicochemical properties of the catalyst are characterized by means of XRD,SEM and H_(2)-TPR.It is indicated that Cu_(1)Ce_(3)-550 catalyst has a uniform distribution of nanoparticles and pore structure,forms a Cu-Ce solid solution,and has the best low-temperature reducibility.The catalyst prepared at a Cu-Ce molar ratio of 1∶3 and a calcination temperature of 550℃ exhibits the best catalytic performance when the space velocity is 15000 h^(-1)and the concentration of p-xylene is 2400 mg·m^(-3).