Abstract
Pt/SiO 2 composite membranes were synthesized by sol-gel process. The average particle size of the mixed sol was below 30 nm and well dispersed in the solution. TEM results show the microstructure of Pt/SiO 2 composite membranes was homogeneous. Average pore size of the Al 2 O 3 support was about 0.125 μm and the pore size distribution was narrow. The average pore size of the Pt/SiO 2 composite membranes has smaller than that of SiO 2 composite membrane. It was observed that the Pt/SiO 2 composite membranes showed a crack-free microstructure and narrow particle size distribution even after heat treatment up to 500°C.
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