Time-resolved XAFS study on the supporting process of Rh6(CO)16 cluster on γ-Al2O3

被引：6

作者：

Suzuki, A ^{[1
]}

Inada, Y ^{[1
]}

Nomura, M ^{[1
]}

机构：

[1] High Energy Accelerator Res Org, Inst Mat Struct Sci, Photon Factory, Tsukuba, Ibaraki 3050801, Japan

来源：

CATALYSIS TODAY | 2006年 / 111卷 / 3-4期

关键词：

time-resolved XAFS measurements by DXAFS; the supporting process of Rh cluster;

D O I：

10.1016/j.cattod.2005.10.046

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The structural change during the supporting process of rhodium cluster [Rh-6(CO)(16)] on Al2O3 has been studied by time-resolved energy-dispersive XAFS. With the increase of temperature, the bridging CO desorbs continuously at first and almost completely desorbs until 460 K. However, less than 20% terminal CO desorbs until 420 K. About 60% terminal CO desorbs between 420 and 500 K and remaining terminal CO desorbs above 500 K. The Rh-Rh distance decreases from 0.277 to 0.268 nm suddenly between 470 and 490 K then gradually decreases to 0.264 nm. About a half Rh-O interaction grew at the same temperature as the change of Rh-Rh distance and remaining Rh-O grows up above 490 K. The support of rhodium cluster on alumina is controlled by the desorption of bridging CO and the Rh-Rh distance changes simultaneously (c) 2005 Elsevier B.V. All rights reserved.

引用

收藏

页码：343 / 348

页数：6

相关论文

共 19 条

[1] Real-space multiple-scattering calculation and interpretation of x-ray-absorption near-edge structure [J].

Ankudinov, AL ;

Ravel, B ;

Rehr, JJ ;

Conradson, SD .

PHYSICAL REVIEW B, 1998, 58 (12) :7565-7576

[2] THE WATER GAS SHIFT REACTION CATALYZED BY RH6(CO)16 ADSORBED ON ALUMINA OR [RH(CO)2CL]2 ADSORBED ON ALUMINA, NA-Y ZEOLITE AND H-Y ZEOLITE [J].

BASSET, JM ;

THEOLIER, A ;

COMMEREUC, D ;

CHAUVIN, Y .

JOURNAL OF ORGANOMETALLIC CHEMISTRY, 1985, 279 (1-2) :147-158

[3] RH6(CO)16 AND ITS IDENTITY WITH PREVIOUSLY REPORTED RH4(CO)11 [J].

COREY, ER ;

BECK, W ;

DAHL, LF .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1963, 85 (08) :1202-&

[4] SUPPORTED METALS AND SUPPORTED ORGANOMETALLICS [J].

GATES, BC ;

LAMB, HH .

JOURNAL OF MOLECULAR CATALYSIS, 1989, 52 (01) :1-18

[5] Synthesis and characterization of site-isolated hexarhodium clusters on titania powder [J].

Goellner, JF ;

Gates, BC .

JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (16) :3269-3281

[6] Double crystal monochromator for x-ray undulator beamline at the PF-AR [J].

Kawata, H ;

Mori, T ;

Adachi, H ;

Matsugaki, N ;

Koyama, A ;

Nomura, M .

SYNCHROTRON RADIATION INSTRUMENTATION, 2004, 705 :663-666

[7] A FAST X-RAY ABSORPTION SPECTROMETER FOR USE WITH SYNCHROTRON RADIATION [J].

MATSUSHITA, T ;

PHIZACKERLEY, RP .

JAPANESE JOURNAL OF APPLIED PHYSICS, 1981, 20 (11) :2223-2228

[8] Design and performance of an X-ray undulator beamline PF-AR-NW2 [J].

Mori, T ;

Nomura, A ;

Sato, A ;

Adachi, H ;

Uchida, Y ;

Toyoshima, A ;

Yamamoto, S ;

Tsuchiya, K ;

Shioya, T ;

Kawata, H .

SYNCHROTRON RADIATION INSTRUMENTATION, 2004, 705 :255-258

[9] NEAR-EDGE X-RAY-ABSORPTION FINE-STRUCTURE OF PB - A COMPARISON OF THEORY AND EXPERIMENT [J].

NEWVILLE, M ;

LIVINS, P ;

YACOBY, Y ;

REHR, JJ ;

STERN, EA .

PHYSICAL REVIEW B, 1993, 47 (21) :14126-14131

[10] SURFACE-SUPPORTED METAL CLUSTER CARBONYLS - CHEMISORPTION DECOMPOSITION AND REACTIVITY OF RH6(CO)16 SUPPORTED ON ALUMINA, SILICA-ALUMINA, AND MAGNESIA [J].

SMITH, AK ;

HUGUES, F ;

THEOLIER, A ;

BASSET, JM ;

UGO, R ;

ZANDERIGHI, GM ;

BILHOU, JL ;

BILHOUBOUGNOL, V ;

GRAYDON, WF .

INORGANIC CHEMISTRY, 1979, 18 (11) :3104-3112