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<p><strong>蜂窩式貴金屬分子篩</strong>沸石分子篩是一類(lèi)具有規則微孔結構的硅鋁酸鹽晶體，其不僅具有一般無(wú)機膜材料的固有的物理化學(xué)特性，更為優(yōu)異的是，其均一的規則的、具有特定的空間走向的結晶孔道系統以及可調變的骨架Si/Al比等特性賦予沸石分子篩膜擁有篩分、擇形功能特性和可調變的膜的表面特性，使其成為實(shí)現分子水平上高效分離及膜催化反應一體化的優(yōu)良多孔膜材料。</p><p>沸石分子篩膜中的傳質(zhì)機理主要是表面擴散和活性化擴散。表面擴散包括吸附和擴散過(guò)程，即首先分子從分離體相進(jìn)入沸石分子孔表面，吸附在表面上和孔中，吸附在表面和孔中的分子在化學(xué)勢的梯度下，從一個(gè)吸附點(diǎn)躍遷至空位或另一個(gè)吸附點(diǎn)，在膜的透過(guò)側脫附擴散進(jìn)入滲透相?；钚曰瘮U散是分子與膜材料表面的吸附作用弱，體相分子進(jìn)入孔后，直接在孔中擴散的過(guò)程。因此，沸石分子篩膜分離選擇性由于分子吸附和擴散的差異而導致不同，沸石膜材料的表面特性、孔道結構與分子的特性如大小與極性是決定了膜的分離性能。另一方面，支撐沸石膜的有效分離層由一多晶沸石層構成的，由于是多晶層，因此多晶層的厚度、連續性、多晶間隙、取向等微觀(guān)結構是決定沸石膜的分離效果的根本因素。與其它膜材料同樣，高性能沸石膜開(kāi)發(fā)的關(guān)鍵任務(wù)在于依據分離體系的分子特性進(jìn)行膜材料的設計和膜的微觀(guān)結構的調控。</p><p><strong>蜂窩式貴金屬分子篩</strong>特點(diǎn)：</p><p>1、表面上的路易斯中心極性很強；</p><p>2、沸石中的籠或通道的尺寸很小，使得其中的引力場(chǎng)很強。因此，其對吸附質(zhì)分子的吸附能力遠超過(guò)其他類(lèi)型的吸附劑。即使吸附質(zhì)的分壓（或濃度）很低，吸附量仍很可觀(guān)。沸石分子篩的吸附分離效果不僅與吸附質(zhì)分子的尺寸和形狀有關(guān)，而且還與其極性有關(guān)，因此，沸石分子篩也可用于尺寸相近的物質(zhì)的分離。</p><p><br/></p><p><br/></p> </div> <div 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