Control of the size of platinum particles on silica surfaces using organic-inorganic composites
Abstract
A series of two tartaric acid-silica (sol-gel and impreg tart-SiO
2
) composites with different tartaric acid contents were prepared using sol-gel and impregnation methods, and then a series of two platinum-silica composites (impreg·sol-gel Pt-SiO
2
and impreg·impreg Pt-SiO
2
) were obtained by impregnating sol-gel and impreg tart-SiO
2
with a platinum solution, followed by drying and calcining. The platinum-silica composites which were obtained were characterized by XRD, N
2
and H
2
adsorption and SEM. From the results, it is concluded that the distribution and particle size of platinum in Pt-SiO
2
can be controlled by using two types of tartaric acid-silica composites with different tartaric acid contents, while keeping the platinum loading constant.
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