Pt3Co and PtCu intermetallic compounds:: Promising catalysts for preferential oxidation of CO in excess hydrogen

被引：137

作者：

Komatsu, Takayuki ^{[1
]}

Tamura, Asako ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Chem, Meguro Ku, Tokyo 1528550, Japan

来源：

JOURNAL OF CATALYSIS | 2008年 / 258卷 / 02期

关键词：

preferential oxidation; carbon monoxide; hydrogen; intermetallic compound; platinum; cobalt; copper;

D O I：

10.1016/j.jcat.2008.06.030

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Pt-based intermetallic compounds (IMCs) supported on silica were studied as a catalyst for the preferential oxidation (PROX) of CO in excess hydrogen to obtain the active catalyst at low temperatures. Pt3CO/SiO2 and PtCU/SiO2 were more active than Pt/SiO2 and Pt/Al2O3 in the temperature range of 373-453 K. Both IMC catalysts were stable during the reaction at 473 K without the irreversible segregation at surface. Infrared (IR). X-ray photoelectron spectroscopy (XPS), and adsorption measurements revealed a significant electron transfer from Pt atoms to Co or Cu atoms. The electron-deficient Pt atoms adsorbed CO weakly compared with Pt metal, accelerating the adsorption of oxygen on the IMC surface. Kinetic studies indicated that Co and Cu atoms in IMCs also adsorb oxygen. This improved oxygen adsorption likely resulted in the high PROX activity at low temperatures. The effects of hydrogen and water on the rate of CO2 formation also were studied. (C) 2008 Elsevier Inc. All rights reserved.

引用

页码：306 / 314

页数：9

共 31 条

[1]

*ASM INT NAT I STA, 1990, BIN ALL PHAS DIAGR, P415

[2] Structure and reactivity of Pt-Ru/SiO2 catalysts for the preferential oxidation of CO under excess H2 [J].

Chin, Soo Yin ;

Alexeev, Oleg S. ;

Amiridis, Michael D. .

JOURNAL OF CATALYSIS, 2006, 243 (02) :329-339

[3] Reaction and surface characterization studies of titania-supported Co, Pt and Co/Pt catalysts for the selective oxidation of CO in H2-containing streams [J].

Epling, WS ;

Cheekatamarla, PK ;

Lane, AM .

CHEMICAL ENGINEERING JOURNAL, 2003, 93 (01) :61-68

[4] ETHYLENE HYDROGENATION OVER CATALYSTS FORMED BY OXIDATION OF INTERMETALLIC COMPOUNDS [J].

IMAMURA, H ;

WALLACE, WE .

JOURNAL OF PHYSICAL CHEMISTRY, 1980, 84 (24) :3145-3147

[5] Supported Pt-Co catalysts for selective CO oxidation in a hydrogen-rich stream [J].

Ko, Eun-Yong ;

Park, Eun Duck ;

Lee, Hyun Chul ;

Lee, Doohwan ;

Kim, Soonho .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2007, 46 (05) :734-737

[6] Pt-Ni/γ-Al2O3 catalyst for the preferential CO oxidation in the hydrogen stream [J].

Ko, Eun-Yong ;

Park, Eun Duck ;

Seo, Kyung Won ;

Lee, Hyun Chul ;

Lee, Doohwan ;

Kim, Soonho .

CATALYSIS LETTERS, 2006, 110 (3-4) :275-279

[7] Fischer-Tropsch synthesis on RuTi intermetallic compound catalyst [J].

Komatsu, T ;

Fukui, Y .

APPLIED CATALYSIS A-GENERAL, 2005, 279 (1-2) :173-180

[8] Catalytic properties of Pt-Ge intermetallic compounds in the hydrogenation of 1,3-butadiene [J].

Komatsu, T ;

Hyodo, S ;

Yashima, T .

JOURNAL OF PHYSICAL CHEMISTRY B, 1997, 101 (28) :5565-5572

[9] Aromatization of butane on Pt-Ge intermetallic compounds supported on HZSM-5 [J].

Komatsu, T ;

Mesuda, M ;

Yashima, T .

APPLIED CATALYSIS A-GENERAL, 2000, 194 :333-339

[10] Nano-size particles of palladium intermetallic compounds as catalysts for oxidative acetoxylation [J].

Komatsu, T ;

Inaba, K ;

Uezono, T ;

Onda, A ;

Yashima, T .

APPLIED CATALYSIS A-GENERAL, 2003, 251 (02) :315-326

← 1 2 3 4 →