Preferential oxidation of CO in H2 stream over Au/MnO2-CeO2 catalysts

被引：126

作者：

Chang, Li-Hsin

Sasirekha, Natarajan

Chen, Yu-Wen ^{[1
]}

Wang, Wei-Jye

机构：

[1] Natl Cent Univ, Dept Chem Engn, Nanocatalysis Res Ctr, Chungli 320, Taiwan

[2] Far E Coll, Dept Chem Engn, Tainan 605, Taiwan

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2006年 / 45卷 / 14期

关键词：

D O I：

10.1021/ie0514408

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

A series of nanosized gold supported on CeO2, MnO2, and MnO2- CeO2 composite oxides have been prepared by a deposition-precipitation (DP) method and the effects of Mn/Ce atomic ratio on Au/MnO2-CeO2 catalysts and calcination temperature after loading gold for preferential oxidation of CO (PROX) in H-2 stream have been investigated using a fixed-bed continuous-flow reactor at various temperatures. The catalysts were characterized by XRD, nitrogen sorption, TEM, and XPS. XRD analysis confirms the phase purity of CeO2 and MnO2 phases and the fine dispersion of Au on Au/MnO2-CeO2 catalysts. XPS analysis shows the formation of MnO2-CeO2 solid phase with manganese loading on ceria support accompanied by an increase in Ce4+ surface concentration. ICP-AES demonstrates the increase in gold loading with manganese addition by DP method. A synergistic catalytic effect on conversion and selectivity was observed in the case of Au/MnO2CeO2 catalysts, due to the coexistence of metallic and nonmetallic gold species within nano gold particle and the minor presence of Ce3+ species.

引用

页码：4927 / 4935

页数：9

共 45 条

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