Promoted CO oxidation activity in the presence and absence of hydrogen over the TiO2-supported Pt/Co-B bicomponent catalyst

作者：Ding, Zhengxin; Yang, Haiyan; Liu, Junfeng; Dai, Wenxin^*; Chen, Xun; Wang, Xuxu; Fu, Xianzhi

来源：Applied Catalysis B: Environmental , 2011, 101(3-4): 326-332.

DOI：10.1016/j.apcatb.2010.10.001

• Oxidation of carbon monoxide
• Platinum cobalt bicomponent catalyst
• Cobalt boron compound
• Electron transfer

A Pt and Co-B bicomponent catalyst supported on TiO2 (Pt/Co-B/TiO2) is prepared by a two-step impregnation-reduction method. This Pt/Co-B/TiO2 catalyst exhibits a higher activity for CO oxidation in the absence of H-2 and for preferential CO oxidation in the presence of H-2, as compared to the Pt/Co bimetallic component catalyst (Pt/Co/TiO2) prepared by H-2 reduction. Based on the results of the X-ray photoelectron spectroscopy analysis, the CO adsorption over different catalysts and the density functional computation of Co-B, it is proposed that the electron transfer from B to Co atoms in Co-B with an amorphous structure may be responsible for the promoted oxidation of CO over Pt/Co-B/TiO2. This electron transfer can keep a high surface electron density of Pt in Pt/Co-B/TiO2 via inhibiting the electron transfer from Pt to Co atoms, which is favorable for the activation of CO species adsorbed at Pt surface.

• 出版日期2011-1-14
• 单位福州大学