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利用in-situ FTIR,TPSR,TEM和CO加氢反应的活性测试,研究了助剂La_2O_3的不同负载方式对Pd/SiO_2催化剂的CO吸附和加氢反应性能的影响。结果表明,La_2O_3作为助剂加入Pd/SiO_2中,能提高CO的解离和加氢能力,引起CO的吸附容量降低,这可能是由于部分还原的La_2Ox斑块修饰了钯粒子的表面所致。因此,La_2O_3助剂对Pd/SiO_2催化剂的吸附和反应性能的影响与La_2O_3的负载方式密切相关。这意味着催化剂的制备方法对La_2O_3和表面钯粒子间的相互作用程度有直接影响。
In-situ FTIR, TPSR, TEM and CO hydrogenation reaction activity tests were conducted to study the effects of different loadings of the promoter La 2 O 3 on the CO adsorption and hydrogenation performance of the Pd / SiO 2 catalyst. The results showed that the addition of La 2 O 3 as a promoter to Pd / SiO 2 could improve the dissociation and hydrogenation ability of CO and decrease the adsorption capacity of CO. This may be due to the modification of the surface of palladium particles by partially reduced La 2 O x plaque. Therefore, the influence of La 2 O 3 additive on the adsorption and reactivity of Pd / SiO 2 catalyst is closely related to the loading mode of La 2 O 3. This means that the preparation of the catalyst has a direct effect on the degree of interaction between La 2 O 3 and the surface palladium particles.