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利用具有理想皂石结构的人工水热合成蒙皂石为层原料,通过与羟基聚合铝离子([Al13O4(OH)24(H2O)12]7+)交换反应合成得到了一种层柱粘土。实验对于该铝柱皂石进行了粉末XRD,FT鄄IR和TG鄄DTA表征。氮气吸附实验说明其高温活化(773K,2h)产物具有很高的BET比表面(360m2·g-1)。相对于层柱蒙脱土,层柱皂石显示了更高的催化裂解性能和热稳定性。层柱皂石的异丙苯裂解转化率达到了65%;而层柱蒙脱土的转化率只有4%。这说明层材料的四面体取代对于层柱粘土Br觟nsted酸位的形成具有重要的决定作用。氨程序升温脱附实验发现铝柱皂石在350~650℃区间具有较强的氨脱附量,表明层柱皂石具有层柱蒙脱土所没有的强酸中心。
Using artificial hydrothermally synthesized smectite as the raw material of the layer with an ideal saponite structure, a pillared clay was obtained by exchanging exchange reaction with hydroxyl-polymerized aluminum ions ([Al13O4 (OH) 24 (H2O) 12] 7+). Experiments for the aluminum column saponite powder XRD, FT-IR and TG-DTA characterization. Nitrogen adsorption experiments showed that the product of high temperature activation (773K, 2h) has a high BET specific surface (360m2 · g-1). Layered saponite exhibits higher catalytic cracking and thermal stability relative to monolayer montmorillonite. The palygorskite cumene pyrolysis conversion rate reached 65%; while the column montmorillonite conversion rate of only 4%. This shows that the tetrahedral substitution of layer materials plays an important role in the formation of Br? Nsted acid sites in pillared clay. Ammonia temperature-programmed desorption experiments showed that the alumina column has a strong ammonia desorption in the range of 350-650 ℃, indicating that the columnar soapstone has a strong acid center which is not found in the column montmorillonite.