不同硅源和铝源对L沸石合成的影响

INFLUENCE OF SOURCES OF SILICA AND ALUMINUM ON SYNTHESIS OF ZEOLITE L

以不同方法生产的氢氧化铝为铝源,以不同牌号的白炭黑为硅源合成L沸石,考察原料对L沸石合成的影响。结果表明:碳分氢氧化铝是最佳铝源;高纯白炭黑是最佳单一硅源,加入超细白炭黑作为硅源可改善合成的L沸石的过滤性质,其在混合硅源中的最佳比例是50%,此时综合效益有望最大。

To study the influence of raw materials on the synthesis of zeolite L, AI（OH）3 from dif ferent sources and fumed-silica of different grades were used. The samples were characterized by XRD and BET. The relative crystallinity was calculated. Results show that the carbonation AI（OH）3 is the best aluminum source for increasing relative crystallinity of L zeolite, and the high purity fumed-silica as a single silicon source has also higher crystallinity of L zeolite. Ultrafine fumed-silica can improve the filtering property of zeolite L, and the optimum ratio of ultrafine fumed-silica in hybrid silicon source is 50~, the highest overall efficiency may be achieved at this point.