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Synthesis of DL-Tartaric Acid from Maleic Anhydride Over SiO.sub.2-Modified WO.sub.3-ZrO.sub.2 Catalyst
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Synthesis of DL-Tartaric Acid from Maleic Anhydride Over SiO.sub.2-Modified WO.sub.3-ZrO.sub.2 Catalyst
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Synthesis of DL-Tartaric Acid from Maleic Anhydride Over SiO.sub.2-Modified WO.sub.3-ZrO.sub.2 Catalyst
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Journal Article
Synthesis of DL-Tartaric Acid from Maleic Anhydride Over SiO.sub.2-Modified WO.sub.3-ZrO.sub.2 Catalyst
2024
Overview
In this work, the addition of 5%SiO.sub.2 to 7.5%WO.sub.3-ZrO.sub.2 catalyst increased the content of tetragonal ZrO.sub.2 and BET, which could promote the formation of W-O-Zr(Si) bonds between WO.sub.x species and 5%SiO.sub.2-ZrO.sub.2 material, thus reducing the degree of aggregation of WO.sub.x species. The oligomerized WO.sub.x species on the 7.5%WO.sub.3-5%SiO.sub.2-ZrO.sub.2 catalyst could not only remain stable, but also provided stable Lewis acid for the activation of hydrogen peroxide and maleic anhydride for epoxidation. In addition, the Si-O-Zr bond on SiO.sub.2-modified 7.5%WO.sub.3-ZrO.sub.2 catalyst could provide an additional Brønsted acid site for activating the hydrolysis of epoxysuccinic acid to DL-tartaric acid. Therefore, the DL-tartaric acid yield of SiO.sub.2-modified 7.5%WO.sub.3-ZrO.sub.2 catalyst was higher than that of 7.5%WO.sub.3-ZrO.sub.2 catalyst, and also higher than that of Na.sub.2WO.sub.4 catalyst.
Publisher
Springer
Subject
