Demonstrating structure repetition of ordered mesoporous sulfated zirconia catalyst in its preparation and application
Abstract
Ordered mesoporous sulfated zirconia was prepared and characterized for its structure, thermal stability and hydrothermal stability, before and after being introduced to oxophosphate process. The zirconium site was also demonstrated during the calcination of the catalyst for it changes and transformations in term of its oxidation states by TRXANES analysis. The results showed that the ordered mesoporous structure was confirmed, and its thermal and hydrothermal stability were very good after the oxophosphate process. The TRXANES also pointed out that the Zr+4 site was begin to be reduced to Zro during the calcination at a certain temperature, and the oxophosphate process improved that catalyst thermal stability by blocking the Zr-OH groups avoiding the reduction. The catalyst also well behaved in the synthesis of biodiesel when exposing a very high yield of the product and gaining a good life span through many reuses and regenarations.
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