Ti-MCM-41 as catalyst for α-pinene oxidation: Study of the effect of Ti content and H₂O₂ addition on activity and selectivity

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• 作者：S ; ra G. Casuscelli ; Griselda A. Eimer ; Analia Canepa ; Angelica C. Heredia ; Carlos E. Poncio ; M&#xf3 ; nica E. Crivello ; Celso F. Perez ; Alfredo Aguilar ; Eduardo R. Herrero
• 关键词：Ti-MCM-41 ; g src="http ; //www.sciencedirect.com/scidirimg/entities/204e.gif" alt="greek small letter alpha" title="greek small letter alpha" border="0">-Pinene ; Campholenic aldehyde ; Allylic oxidation ; Fragrance
• 刊名：Catalysis Today
• 出版年：2008
• 期刊代码：13_09205861
• 类别：ce
• 出版时间：April-June 2008
• 卷：133-135
• 期：Complete
• 页码：678-683
• 文件大小：447 K

摘要

Ti containing mesoporous materials with a MCM-41 structure were applied as heterogeneous catalysts for the liquid phase oxidation of g src="http://www.sciencedirect.com/scidirimg/entities/204e.gif" alt="greek small letter alpha" title="greek small letter alpha" border="0">-pinene with hydrogen peroxide at 343 K. The catalysts were characterized by N₂ adsorption, XRD and DRUV-Vis. The results obtained by varying the Ti content showed slight changes in the g src="http://www.sciencedirect.com/scidirimg/entities/204e.gif" alt="greek small letter alpha" title="greek small letter alpha" border="0">-pinene conversion. The major products were verbenol, verbenone and campholenic aldehyde with a conversion about 12–16%. The yield of the reaction products was duplicated when an additional amount of H₂O₂ was added after 1 h of reaction. A high selectivity was obtained for the products of the allylic oxidation. A reaction mechanism was proposed in order to explain the obtained results.