Isomerization and Arylation of Oleic Acid on Anion Modified Zirconia Catalysts

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• 作者：Shuguang Zhang ; Jinxia Zhou and Z. Conrad Zhang
• 关键词：Isomerization ; Arylation ; Fatty acid ; Aromatic ; Catalyst
• 刊名：Catalysis Letters
• 出版年：2009
• 出版时间：January, 2009
• 年：2009
• 卷：127
• 期：1-2
• 页码：33-38
• 全文大小：340.5 KB

文摘

The catalytic performance of anion modified zirconia catalysts, such as sulfated zirconia (SO₄/ZrO₂) and tungstated zirconia (WO₃/ZrO₂), was evaluated for the upgrading of oleic acid (OA). In the presence of an aromatic compound, two main reactions occurred on the catalysts: the skeletal isomerization of OA and the arylation of OA with aromatics. The activity of the SO₄/ZrO₂ was more than triple of that of the WO₃/ZrO₂. At 250 ¡ãC, OA/(SO₄/ZrO₂)(wt/wt) = 5, the OA conversion and the arylation selectivity reached their maximal values and the isomerization selectivity was the lowest when the toluene to OA (toluene/OA) molar ratio was about 6. When mesitylene was used instead of toluene, the OA conversion and the arylation selectivity decreased, probably because of a steric effect. An attempt to reuse the SO₄/ZrO₂ by solvent washing after a run was not so successful, while calcination at 630 ¡ãC in air recovered the activity completely.