57Fe Mossbauer Spectroscopy of Ir-Fe Catalysts for Preferential CO Oxidation in H2

被引：3

作者：

Liu Kuo ^{[1
,2
]}

Zhang Wansheng ^{[1
]}

Wang Junhu ^{[1
]}

Wang Aiqin ^{[1
]}

Huang Yanqiang ^{[1
]}

Jin Changzi ^{[1
]}

Shen Jianyi ^{[3
]}

Zhang Tao ^{[1
]}

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Liaoning, Peoples R China

[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

[3] Nanjing Univ, Dept Chem, Nanjing 210093, Jiangsu, Peoples R China

来源：

CHINESE JOURNAL OF CATALYSIS | 2010年 / 31卷 / 11期

基金：

中国国家自然科学基金;

关键词：

carbon monoxide; selective oxidation; iridium; iron; quasi Mossbauer spectroscopy; microcalorimetry; metal-metal interaction; CARBON-MONOXIDE; ROOM-TEMPERATURE; HYDROGEN; NANOPARTICLES; PROMOTION; SURFACE; GASES; PTFE;

D O I：

10.1016/S1872-2067(10)60122-2

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

New insights on the interaction between Ir and Fe oxide are reported. Three Ir-Fe catalysts were prepared by different impregnation sequences of an Al2O3 support. Co-impregnation gave a better catalyst for the preferential CO oxidation in H-2 (PROX) reaction. Microcalorimetry data showed that the adsorption of CO and H-2 were different. Quasi in situ Mossbauer data of the three catalysts after reduction, reoxidation, and PROX reaction showed that a strong interaction between Ir and Fe affected the redox properties of the Ir-Fe catalysts. CO conversion was proportional to the concentration of the Fe2+(a) species, thus, Fe2+(a) was an active site in the PROX reaction. The impregnation sequence influenced the interaction between Ir and Fe and consequently, the amount of the active Fe2+(a) species. A strong Ir-Fe interaction stabilized the active Fe2+ sites for activating O-2.

引用

页码：1335 / 1341

页数：7

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