Synthesis of hybrid SBA-15 functionalized with molybdophosphoric acid as efficient catalyst for glycerol esterification to fuel additives

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• 作者：M.S. Khayoon ; B.H. Hameed
• 关键词：Glycerol ; Esterification ; SBA-15 ; Molybdophosphoric acid ; MoO3
• 刊名：Applied Catalysis A: General
• 出版年：2012
• 出版时间：8 August, 2012
• 年：2012
• 卷：433-434
• 期：Complete
• 页码：152-161
• 全文大小：966 K

文摘

Fibrous mesoporous hybrid silica (SBAH-15) with mesopore diameter of 70 ? was synthesized using pluronic P123 (EO<sub>20sub>PO<sub>70sub>EO<sub>20sub>) as surfactant, with Brij S100 as nonionic co-surfactant. Series of catalysts with different molybdophosphoric acid (MPA) loading (5-25 % ) were synthesized by the thermal decomposition of MPA species in the lattice of SBAH-15. Catalysts calcined at 560 ¡ãC undergone a thermal decomposition of MPA resulted in the formation of ¦Â-MoO<sub>3sub> active species. The effectiveness of the hybrid support was evaluated by comparison with analogous catalyst prepared by incorporating MPA into the framework of classical SBA-15. The catalytic performance of the prepared acid catalysts was examined during glycerol esterification with acetic acid. Mono-, di- and triacetyl glycerol (MAG, DAG and TAG, respectively) were the esterification reaction products. SBAH-15(15) catalyst, with 15 wt. % MPA loading, exhibited an excellent activity during this reaction, indicated by the complete glycerol conversion (after 1 h) with a corresponding combined selectivity of 86 % toward both DAG and TAG. The best reaction conditions are: reaction temperature of 110 ¡ãC, glycerol to acetic acid molar ratio of 1:6 and reaction time of 3 h. The SBAH-15(15) catalyst demonstrated good stability in activity upon recycling for four times.