کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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41244 | 45882 | 2011 | 10 صفحه PDF | دانلود رایگان |
Partial oxidation of lactose over Au-based catalyst system using nanostructured silica materials with improved activity, selectivity and stability was investigated as a novel chemo-catalytic approach for selective synthesis of lactobionic acid (LBA) for therapeutic, pharmaceutical and food grad applications.Highly active gold crystallites dispersed on mesoporous silica (SiO2-meso) using bis-[3-(triethoxysilyl) propyl] tetrasulfide (BTSPT), a silane coupling agent to immobilize gold, were successfully formulated, and their catalytic activity was evaluated in an agitated semi-batch reactor. The catalysts were characterized by N2 physisorption, XRD, XPS and TEM. The influence of the reaction conditions, i.e., temperature, pH value, metal loading and catalyst/lactose ratio on lactose conversion were investigated. After 100 min of reaction, the catalyst containing 0.7% Au showed the highest catalytic activity (100% lactose conversion) and a 100% selectivity towards LBA, when it was used at a catalyst/lactose ratio of 0.2 under alkaline (pH 9.0) and mild reaction temperature (65 °C).
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► Highly active gold crystallites successfully dispersed on mesoporous silica (SiO2-meso).
► SiO2-meso presents a wormhole-like framework with interconnected 3D-mesopores.
► 0.7% Au/SiO2-meso is very active for lactose partial oxidation to lactobionic acid (LBA).
► 0.7% Au/SiO2-meso is 100% selective towards LBA production.
Journal: Applied Catalysis A: General - Volume 402, Issues 1–2, 31 July 2011, Pages 94–103