X-ray absorption spectroscopic studies on gold nanoparticles in mesoporous and microporous materials

被引:20
作者
Akolekar, DB
Foran, G
Bhargava, SK
机构
[1] RMIT Univ, Dept Appl Chem, Catalysis & Adv Mat Res Grp, Melbourne, Vic 3001, Australia
[2] Australian Nucl Sci & Technol Org, Australian Synchrotron Res Program, Menai, NSW 2234, Australia
关键词
gold nanoparticles; mesoporous materials; MCM-41; microporous materials; ZSM-5; LSX; low silica faujasite; EXAFS; XANES; SAPO-18; surface properties; Au;
D O I
10.1107/S0909049504001694
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Au L-3-edge X-ray absorption spectroscopic measurements were carried out over a series of mesoporous and microporous materials containing gold nanoparticles to investigate the effects of the host matrix and preparation methods on the properties of gold nanoparticles. The materials of structure type MCM-41, ZSM-5, SAPO-18 and LSX with varying framework composition containing low concentrations of gold nanoparticles were prepared and characterized. In these materials the size of the gold nanoparticles varied in the range similar to1 to 4 nm. A series of gold nanoparticles within different mesoporous and microporous materials have been investigated using X-ray absorption fine structure (XANES, EXAFS) and other techniques. Information such as atomic distances, bonding and neighbouring environment obtained from XAFS measurements was useful in elucidating the nature and structure of gold nanoparticles on these catalytic materials. The influence of the high-temperature ( 823, 1113, 1273 K) treatment on gold nanoparticles inside the mesoporous matrix was investigated using the XAFS technique. The XAFS and XANES results confirm various characteristics of gold nanoparticles in these materials suitable for catalysis, fabrication of nanodevices and other applications.
引用
收藏
页码:284 / 290
页数:7
相关论文
共 36 条
[1]  
Akolekar D, 1997, STUD SURF SCI CATAL, V105, P755
[2]   The transformation of kaolin to low-silica X zeolite [J].
Akolekar, D ;
Chaffee, A ;
Howe, RF .
ZEOLITES, 1997, 19 (5-6) :359-365
[3]   FTIR investigations of the adsorption and disproportionation of NO on Cu-exchanged silicoaluminophosphate of type 34 [J].
Akolekar, DB ;
Bhargava, SK ;
Foger, K .
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1998, 94 (01) :155-160
[4]   CRYSTALLINE MICROPOROUS MAPO-36 MOLECULAR-SIEVE - SYNTHESIS AND CHARACTERIZATION [J].
AKOLEKAR, DB .
JOURNAL OF CATALYSIS, 1993, 143 (01) :227-238
[5]  
AKOLEKAR DB, 2004, UNPUB APPL CATAL
[6]  
*AUSTR SYNCHR RES, 1995, XFIT WIND 95
[7]   Numerical simulation of the platinum L-III edge white line relative to nanometer scale clusters [J].
Bazin, D ;
Sayers, D ;
Rehr, JJ ;
Mottet, C .
JOURNAL OF PHYSICAL CHEMISTRY B, 1997, 101 (27) :5332-5336
[8]  
BELLUSSI G, 1988, INNOVATION MAT SCI
[9]   Structure and bonding of gold metal clusters, colloids, and nanowires studied by EXAFS, XANES, and WAXS [J].
Benfield, RE ;
Grandjean, D ;
Kröll, M ;
Pugin, R ;
Sawitowski, T ;
Schmid, G .
JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (10) :1961-1970
[10]   Al-MCM-41 catalysed alkylation of phenol with methanol [J].
Bhattacharyya, KG ;
Talukdar, AK ;
Das, P ;
Sivasanker, S .
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 2003, 197 (1-2) :255-262