It will take longer to utilize Au catalysts in the chemical
industry. There are possibilities of earlier commercialization
in selective partial oxidation in liquid phase for fine chemicals.
As for bulk chemical production, the direct epoxidation of
propylene can be commercialized if the yield of propylene oxide
(PO) is improved to 10% from the present level of 3%, and the
efficiency of H2 is improved to 50%, at least, from 20~30%.
Gold supported on anatase TiO2 is selective only at
temperatures below 353K. Because this temperature is not
sufficiently higher than the boiling point of PO (307K),
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