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huijieyu新蟲(chóng) (初入文壇)
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[求助]
求助最基本的sol gel制備gamma alumina.
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happy new year. COuld I ask for some advice on sol gel preparationi of Al2O3? According to one paper: mesoporous gamma-Al2O3: The mesoporous Al2O3 materials have been prepared using the following procedure: 4.2 g of aluminium i-propoxide and 3.6 g of glucose were dissolved in 54 ml of distilled water, the resultant solution was stirred at room temperature for 30 min. The molar ratio of Al3+:glucose:H2O in the solution was 1:1:75. Then a diluted aqueous nitric acid (10 wt.%) solution was added dropwise to adjust the pH value. After standing for 5 h, the mixture was heated at 100 °C in open air to remove water and all other volatiles. The resulted solid was then calcined at 600 °C for 6 h to remove the template. My questions: 1. 這個(gè)制備是要用什么反應(yīng)器? 80度水解和縮聚時(shí), 很多水會(huì)從燒杯中流失. 我用三頸瓶加回流冷凝管, 也發(fā)現(xiàn)很多水在瓶壁和管口. 所以沒(méi)法控制水的molar ratio啊? 2. 水解的pH5.5, 如何控制啊? 80度時(shí), 用pH meter插到反應(yīng)液中連續(xù)檢測(cè)嗎? 我從沒(méi)看到過(guò)無(wú)機(jī)材料制備, 請(qǐng)指教. THANKS |
木蟲(chóng) (職業(yè)作家)

新蟲(chóng) (初入文壇)
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