纯硅MCM-41中孔分子筛合成因素的研究Ⅰ.Na^+、K^+阳离子对合成的影响

RESEARCH ON SYNTHESIS FACTORS OF SILICABASED MESOPOROUS MOLECULAR SIEVE MCM41 Ⅰ EFFECT OF CATION Na^+,K^+ ON THE SYNTHESIS

本文采用表面活性剂十六烷基三甲基溴化铵（Ｃ１６ＴＡＢｒ，以下为１６３１），在（Ｎａ，Ｋ）ＯＨＳｉＯ２Ｃ１６ＴＡＢｒＨ２Ｏ体系中分别利用室温、水热及干粉法进行了纯硅ＭＣＭ４１中孔分子筛的合成，考察了阳离子Ｎａ＋、Ｋ＋对ＭＣＭ４１合成及稳定性的影响。通过ＸＲＤ对结晶度的测定，发现ＮａＭＣＭ４１的晶化速率明显高于ＫＭＣＭ４１，而热稳定性和水热稳定性较差，且ａ０值小于后者。同时发现，就合成方法而言，室温法得到的产物具有很高的结晶度，利用水热法合成的样品的热稳定性明显较高，而干法得到的分子筛产品具有优良的水热稳定性。

Mesoporous silicabased molecular sieves MCM41 were synthesized in (Na, K)OHSiO_2C_16TABr(H_2O) system by tree different approaches (namely the room temperature, hydrothermal and dry powder methods) to investigate the influences of Na^+ and K^+ cations on their crystallization and properties By using Na^+ in stead of K^+, MCM41 could be prepared with higher crystallization rate, lower thermal and hydrothermal stabilities, and smaller lattic parameter As to synthesis method, MCM41 sample synthesized by room temperature approach had great higher crystallinity; The product prepared hydrothemally exhibits better to thermal resistance; the sample obtained by dry powder method had significant higher hydrothermal stability