A Non-sodium Synthesis of Highly Ordered V-MCM-41 and Its Catalytic Application in Isomerization

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• 作者：Shuangquan Hu ; Dapeng Liu ; Lusi Li ; Armando Borgna and Yanhui Yang
• 关键词：V ; MCM ; 41 ; Non ; sodium ; Isomerization
• 刊名：Catalysis Letters
• 出版年：2009
• 出版时间：May, 2009
• 年：2009
• 卷：129
• 期：3-4
• 页码：478-485
• 全文大小：332.6 KB

文摘

A rapid non-sodium process was developed to synthesize highly ordered V-MCM-41 mesoporous materials with atomic level dispersed vanadium species. NH₃¡¤H₂O instead of NaOH was used to maintain the moderately basic synthesis condition. The characterization results of N₂ physisorption and XRD showed that the synthesized samples had highly ordered hexagonal structure. UV–Vis, UV-Raman, and EPR spectra provided evidence that most vanadium ions were tetrahedrally incorporated into the framework of siliceous MCM-41. The NH₃-TPD proved the mild acidity of V-MCM-41 due to the incorporation of vanadium cations. The most important variables were structural order and vanadium loading which can be controlled easily by changing synthesis variables in such a way that collapse of the V-MCM-41structure did not occur. The synthesized V-MCM-41 catalysts successfully catalyzed the isomerization of heptene. High conversion and isomer selectivity were achieved with good catalytic stability. The structure of V-MCM-41 can be well preserved after reaction.