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<p>沸石礦物有很廣的分布。特別多見(jiàn)于由火山碎屑形成的沉積巖石中，在土壤中也有發(fā)現。</p><p>分子篩是一種具有立方晶格的硅鋁酸鹽化合物。分子篩具有均勻的微孔結構，它的孔穴直徑大小均勻，這些孔穴能把比其直徑小的分子吸附到孔腔的內部，并對極性分子和不飽和分子具有優(yōu)先吸附能力，因而能把極性程度不同，飽和程度不同，分子大小不同及沸點(diǎn)不同的分子分離開(kāi)來(lái)，即具有“篩分"分子的作用，故稱(chēng)分子篩。由于分子篩具有吸附能力高，熱穩定性強等其它吸附劑所沒(méi)有的優(yōu)點(diǎn)，使得分子篩獲得廣泛的應用。</p><p>沸石對有機污染物的吸附能力主要取決于有機物分子的極性大小和分子直徑。小分子比大分子易被吸附，極性分子較非極性妃子易被吸附，在水中由于存在不同的物質(zhì)(如有機物分子、金屬離子和水分子)，他們的極性強弱和分子大小均不相同，在吸附時(shí)就會(huì )產(chǎn)生競爭現象。</p><p>特點(diǎn)</p><p>1、具有*，深度干燥分離度；</p><p>2、可以有效地避免分離時(shí)所產(chǎn)生共吸附現象，提高產(chǎn)品得率；</p><p>3、可以在同一系統中同時(shí)完成干燥和物質(zhì)的純化；</p><p>4、在較高的溫度條件下，同樣具有一定的吸附容量；</p><p>5、分子篩系統較其他干燥和分離裝置，設備投資低，運轉成本低。</p><p>沸石分子篩在各種不同的酸性催化反應中，能夠提供很高的活性和不尋常的選擇性，且絕大多數反應是由分子篩的酸性引起的，酸度及其酸強度分布是分子篩的重要參數。研究表明，分子篩中B 酸來(lái)源于骨架四面體鋁，而L 酸主要來(lái)源于非骨架六面體鋁，所以分子篩中Al 的含量及其分布與分子篩的表面酸性物質(zhì)密切相關(guān)，故可采用分子篩的脫鋁和補鋁等二次水熱處理，得到理想的硅鋁比的分子篩。此外，分子篩的酸性還受取代金屬離子影響，由于多價(jià)金屬離子的水解作用，導致催化劑表面酸中心重新分布。</p><p><br/></p> </div> <div id="h7hjvdb" class="ly_PrevNext"> <ul> <li>上一篇：<a 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