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The effects of La_2O_3 as a promoter of Pd/SiO_2 catalyst and its loading manner on thechemisorption and hydrogenation of CO have been investigated using in situ FTIR,TPSR,CO adsorp-tion,activity evaluation of methanation and TEM.The results show that the addition of La_2O_3 to thePd/SiO_2 can promote the dissociation and hydrogenation of CO,but causes a noticeable suppression inchemisorption of CO.This is probably due to partially reduced La_2O_3 moieties which decorate the sur-face of Pd particles.In addition,the effects of La_2O_3 promotion on the adsorptive and reactive propertiesof Pd/SiO_2 depend strongly on the loading manner of La_2O_3.It means that the method of preparationhas a significant effect on the degree of interaction between La_2O_3 and the surface of Pd particles.
The effects of La 2 O 3 as a promoter of Pd / SiO 2 catalyst and its loading manner on the chemisorption and hydrogenation of CO have been investigated using in situ FTIR, TPSR, CO adsorption, activity evaluation of methanation and TEM.The results show that the addition of La 2 O 3 to the Pd / SiO 2 can promote the dissociation and hydrogenation of CO, but causes a noticeable suppression inchemisorption of CO. This is probably due to partially reduced La 2 O 3 moieties which decorate the sur-face of Pd particles. In addition, the effects of La 2 O 3 promotion on the adsorptive and reactive properties of Pd / SiO_2 depend strongly on the loading manner of La_2O_3.It means that the method of preparationhas a significant effect on the degree of interaction between La_2O_3 and the surface of Pd particles.