Zirconium and phosphorous modified SBA-15: texture, enhanced acidity and methanol dehydration activity

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• 作者：Karina Cruz-Rodríguez…
• 关键词：SBA ; 15 ; Zirconium ; Phosphorous ; Methanol dehydration ; DME
• 刊名：Reaction Kinetics, Mechanisms and Catalysis
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：120
• 期：1
• 页码：371-384
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Catalysis; Physical Chemistry; Industrial Chemistry/Chemical Engineering;
• 出版者：Springer Netherlands
• ISSN：1878-5204
• 卷排序：120

文摘

Using an alternative synthesis technique, SBA-15 was modified with zirconium (Zr/Si = 0.03) and phosphorus (P/Si = 0.09). The materials were characterized by thermogravimetry (TGA-DTG), N₂ physisorption (BET method), X-ray diffraction (XRD), scanning electron and transmission electron microscopy (SEM, TEM), and the potentiometric titration with n-butylamine (n-BTA) technique. Catalyst evaluation was performed for methanol decomposition in the temperature range of 653–663 K. The introduction of zirconium and phosphorus in the SBA-15 in the amount studied does not modify the textural and structural properties of the SBA-15, but promotes the creation of weak-medium acid sites, which direct the activity towards dimethyl ether (DME) formation from the methanol dehydration, as well as traces of other products of the reaction.