丙烯腈尾气低温氧化催化剂的制备及性能评价

以 Pd 为活性组分，Al2O3/CeO2 为载体，采用浸渍法制备出一系列丙烯腈尾气（AOG）低温氧化催化剂。利用 BET，XRD，CO-DRIFTS，XPS 等分析方法对催化剂进行了物性表征，并评价了其对 AOG 中可燃物的催化活性。结果表明，Pd 负载量最佳值为3%，负载在 CeO2 上的 Pd 处于更高价态，分散程度优于 Al2O3；随着 Pd 负载量增大，催化剂对 CO，C3H6和C3H8的起燃活性均升高，半转化温度（T50）降低；以CeO2作为载体，有助于促进CO和烃类的低温转化。

Preparation and performance evaluation of acrylonitrile off-gas low-temperature oxidation catalyst

A series of acrylonitrile off-gas low temperature oxidation catalysts were prepared by impregnation method using Pd as active component and Al2O3 or CeO2 as carrier.The catalysts were characterized by BET,XRD,CO-DRIFTS and XPS,and the catalytic activity were evaluated.The results showed that the best Pd loading mass fraction was 3％.The catalyst of Pd/CeO2 had higher oxidation states and dispersion than Pd/ Al2O3.With increasing Pd loading mass fraction,the light-off performance of the catalyst for CO,C3H6,C3Hs was improved and the half-conversion temperature （T50） decreased.The conversion at low temperature of CO and hydrocarbon was promoted with CeO2 as carrier.