Macroporous Monolithic Pt/gamma-Al(2)O(3) and K-Pt/gamma-Al(2)O(3) Catalysts Used for Preferential Oxidation of CO

作者：Zhang Yuan; Zhao Cun Yu; Liang Hao; Liu Yuan^*

来源：Catalysis Letters, 2009, 127(3-4): 339-347.

DOI：10.1007/s10562-008-9686-z

• Monolith
• Macropore
• Preferential oxidation
• Platinum
• Potassium
• Alumina

Macro-porous monolithic gamma-Al(2)O(3) was prepared by using macro-porous polystyrene monolith foam as the template and alumina sol as the precursor. Platinum and potassium were loaded on the support by impregnation method. TG, XRD, N(2) adsorption-desorption, SEM, TEM, and TPR techniques were used for catalysts characterization, and the catalytic performance of macro-porous monolithic Pt/gamma-Al(2)O(3) and K-Pt/gamma-Al(2)O(3) catalysts were tested in hydrogen-rich stream for CO preferential oxidation (CO-PROX). SEM images show that the macropores in the macro-porous monolithic gamma-Al(2)O(3) are interconnected with the pore size in the range of 10 to 50 mu m, and the monoliths possess hierarchical macro-meso(micro)-porous structure. The macro-porous monolithic catalysts, although they are less active intrinsically than the particle ones, exhibit higher CO conversion and higher O(2) to CO oxidation selectivity than particle catalysts at high reaction temperatures, which is proposed to be owing to its hierarchical macro-meso(micro) -porous structure. Adding potassium lead to marked improvement of the catalytic performance, owing to intrinsic activity and platinum dispersion increase resulted from K-doping. CO in hydrogen-rich gases can be removed to 10 ppm over monolithic K-Pt/gamma-Al(2)O(3) by CO-PROX.

• 出版日期2009-2
• 单位天津大学