2009•Indian Journal of Chemical TechnologyOpen access
Influence of preparation method on the performance of Pd/ ZrO 2 -Al 2 O 3 catalysts for HDS
Sufen Chen, Laitao Luo, Cheng Xin-sun
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Abstract
ZrO2-Al 2 O 3 (I) and ZrO 2 -Al 2 O 3 (S) mixed supports were prepared using impregnation and sol-gel methods, separately. Influences of preparation methods on the properties of Pd based catalysts for hydrodesulphurization (HDS) of thiophene were studied. The prepared samples were characterized by means of XRD, H 2 -TPD, H 2 -TPR, XPS, NH 3 -TPD, H 2 chemisorption and BET surface area. Pd/ZrO 2 -Al 2 O 3 (S) catalyst supported on ZrO 2 -Al 2 O 3 (S) exhibited much higher HDS activity than that of the Pd/ZrO 2 -Al 2 O 3 (I) catalyst supported on ZrO 2 -Al 2 O 3 (I). As compared with Pd/ZrO 2 -Al 2 O 3 (I) catalyst, Pd/ZrO 2 -Al 2 O 3 (S) catalyst has higher dispersion, more acid sites and stronger interaction between palladium and mixed support, which presented an increasing driving-force toward the catalyzed conversion of thiophene.