TY - JOUR
T1 - Synthesis and characterization of palladium clusters dispersed alumina membranes
AU - Chen, Huey Ing
AU - Shiau, Jang Daw
AU - Chu, Chin Yi
AU - Huang, Ting Chia
N1 - Funding Information:
This work was performed under the auspices of the National Science Council of the Republic of China, under contract NSC89-2214-E006-036. The authors wish to express their thanks. Besides, we are very appreciated to Dr J.F. Lee (Synchrotron Radiation Research Center, Taiwan) for the sample analysis with EXAFS, and Professor J.R. Chang (Department of Chemical Engineering, National Chung Cheng University, Taiwan) for the helpful discussion on EXAFS results. We are also grateful to the staff of beam line X-11A at the National Synchrotron Light Source, USA, for their assistance.
PY - 2003/7/1
Y1 - 2003/7/1
N2 - In this work, the high metal-dispersion Pd/Al2O3 composite membranes were prepared by wetness-impregnation technique. The effects of preparation parameters, including Pd precursor concentration, pH value and temperature, on the loading and particle size of Pd, and the characteristics of the resultant membranes were investigated. The experimental results showed that the impregnation of Pd followed the Langmuir-type adsorption model. The optimal conditions for impregnation were pH 1.5 and 1.2 wt.% Pd concentration. The size of Pd clusters estimated from the extended X-ray absorption fine structure spectroscopy (EXAFS) characterization was about 3.3 nm, independent of Pd loading within 2-7.8 wt.%. This revealed that the growth of Pd clusters was strongly hindered by the pore size of Al2 O3 membranes. Furthermore, the blocking of Pd in pores resulted in the promotion of H2/N2 selectivity.
AB - In this work, the high metal-dispersion Pd/Al2O3 composite membranes were prepared by wetness-impregnation technique. The effects of preparation parameters, including Pd precursor concentration, pH value and temperature, on the loading and particle size of Pd, and the characteristics of the resultant membranes were investigated. The experimental results showed that the impregnation of Pd followed the Langmuir-type adsorption model. The optimal conditions for impregnation were pH 1.5 and 1.2 wt.% Pd concentration. The size of Pd clusters estimated from the extended X-ray absorption fine structure spectroscopy (EXAFS) characterization was about 3.3 nm, independent of Pd loading within 2-7.8 wt.%. This revealed that the growth of Pd clusters was strongly hindered by the pore size of Al2 O3 membranes. Furthermore, the blocking of Pd in pores resulted in the promotion of H2/N2 selectivity.
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U2 - 10.1016/S1383-5866(03)00066-2
DO - 10.1016/S1383-5866(03)00066-2
M3 - Article
AN - SCOPUS:0037908654
SN - 1383-5866
VL - 32
SP - 247
EP - 254
JO - Separation and Purification Technology
JF - Separation and Purification Technology
IS - 1-3
ER -