Synthesis of hydrothermally stable MCM-41 with initial adjustment of pH and direct addition of NaF
Synthesis of hydrothermally stable MCM-41 with initial adjustment of pH and direct addition of NaF
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DOI：
10.1016/s1387-1811(00)00194-3
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发表时间：
2000-09-01
影响因子：
5.2
通讯作者：
Hayhurst, DT
中科院分区：
文献类型：
--
作者：
Kim, WJ;Yoo, JC;Hayhurst, DT
水热稳定的MCM-41的合成在100 ° C下在15毫升特氟隆衬里的Morey型高压釜中进行24小时。结果表明，水热稳定的MCM-41具有长程有序的六方结构，易于制备。通过添加适量的NaF和适当的pH调节，合成的MCM-41在433 K以下具有良好的水热稳定性。XRD、魔角自旋Si-29 NMR、N2-吸附和TEM数据表明其结构有序。结果发现，加入氟化钠和混合的顺序是形成这种水热稳定的MCM-41的关键。(C)2000 Elsevier Science B. V.保留所有权利。
The synthesis of a hydrothermally stable MCM-41 was conducted at 100 degrees C for 24 h ill a 15 mi Teflon-lined Morey type autoclaves. Results show that a hydrothermally stable MCM-41 with long range ordering of its hexagonal array can easily be prepared. With addition of an optimum amount of NaF and with appropriate pH adjustment, an assynthesized MCM-41 shows excellent hydrothermal stability up to 433 K. XRD, magic angle spinning Si-29 NMR, N-2-adsorption and TEM data show well-ordered structure. It was found that the addition of NaF and the order of mixing are critical in the formation of this hydrothermally stable MCM-41. (C) 2000 Elsevier Science B.V. All rights reserved.