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由粉煤灰合成鋁硅酸鹽介孔材料

發(fā)布時(shí)間: 2012-09-15 10:30 查看: 2687次

介孔分子篩粉煤灰合成工藝助熔劑
摘要：

以粉煤灰為初始原料,在堿性條件下合成了介孔鋁硅酸鹽材料.以粉煤灰與Na2CO3摩爾比為1∶0.85配料,混合物料研磨混合10min,在830℃焙燒2.5 h,使鋁硅酸鹽分解生成水溶性的硅酸鹽(硅源)和鋁酸鹽(鋁源),而后與表面活性劑十六烷基三甲基溴化銨水溶液(含有14.7 g表面活性劑)混合.混合溶膠經(jīng)105℃晶化72h,再經(jīng)過濾得到的白色粉末,經(jīng)550℃焙燒5h后,獲得介孔鋁硅酸鹽材料.所獲得的介孔材料的d100為2.16 nm,平均孔徑為4.75 nm,孔徑分布主要介于0.5～10 nm之間.

Abstract：

Mesoporous aluminosilicate was synthesized in alkaline conditions with fly ash as starting material. A mixture of fly ash and Na2CO3 with a molar ratio of 1:0.85 was first mixed uniformly in a mill for 10min and then calcined at 830 ℃ for 2.5h to decompose the aluminosilicate in the framework and forming aqueous soluble silicate (silicon source) and aluminate (aluminum source).The calcined mixture was mixed with cetylteriaethyl ammonium bromide (C16TMABr) aqueous solution (containing 14.7 g CTMABr).After the mixture solution was aged at 105 ℃ for 72h and filtered, a white powder was obtained, and then it was calcined at 550 ℃for 5 h to get a mesoporous aluminosilicate material. The as-synthesized sample has an interplanar distance d100 of 2.16 nm and a mean pore diameter of 4.75 nm; the pore diameter distribution of the product is mainly between 0.5 and 10nm.

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