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用 L a2 O3对γ- A2 O3进行改性 ,并以之为载体用浸渍法制备钯系列催化剂 ,在加压装置上以合成甲醇为探针反应评价了催化剂活性 ,利用 BET、XRD、吡啶吸附及程序升温脱附等手段考察了改性剂 L a2 O3对载体的比表面、晶型转变及表面酸性的影响 ,用 TPR考察了L a2 O3对催化剂还原性能的影响 ,结合 XPS、SEM、EPMA的测试结果 ,得出 L a2 O3的最佳负载量为 5 % .由于 L a2 O3的加入 ,影响了催化剂对 CO的吸附能力和吸附形式 ,是以 5 % L a2 O3改性的催化剂活性高、甲醇选择性好的重要原因 .
The γ-A2 O3 was modified by L a2 O3 and used as the support to prepare the palladium series catalyst by impregnation method. The catalyst activity was evaluated by using methanol as the probe reaction on the pressurization device. The catalysts were characterized by BET, XRD and pyridine adsorption And temperature programmed desorption were used to investigate the effect of L a2 O3 on the specific surface area, crystal transition and surface acidity of the support. The effect of L a2 O3 on the reduction performance of the catalyst was investigated by TPR. XPS, SEM, EPMA The results showed that the optimum loading of L 2 O 3 was 5% .The addition of L a 2 O 3 affected the adsorption capacity and adsorption form of CO on the catalyst, and the activity of the catalyst modified with 5% L a 2 O 3 was high , Methanol selectivity is an important reason.