Vanadiumjsilica and copper/silica aerogels have been prepared using the sol-gel method followed by C02 exchange and supercritical extraction. Structural properties of samples supercritically dried, oxidized and used in reactions studies conducted with a feed representing the average composition of automobile exhaust from a lean burn engine were investigated using laser Raman spectroscopy and temperature-programmed reduction. No evidence of crystalline V2O5 was found for the vanadium/silica aerogel, freshly extracted, oxidized or following exposure to reaction conditions using these techniques. However, resuIts obtained for the copper/silica sample indicate that changes in the structure of the copper species had occurred as the sample was oxidized and exposed to reaction conditions. Work performed under the auspices of the U.S. Department of Energy by the Lawrence Livermore National Laboratory under Contract W-7405-Eng-48.
This is an informal reporl intended primarily for internal or limited external distribution. The opinions and conclusions staled are thnse of thv author jnd mav or may not be those of the Laboratory.
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