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nm以上為大孔分子篩)，介孔分子篩具有高的比表面積、規(guī)則有序的孔道結(jié)構(gòu)、狹窄的孔徑分布、孔徑大小連續(xù)可調(diào)等特點(diǎn)，使得它在很多微孔分子篩難以完成的大分子的吸附、分離，及催化反應(yīng)中發(fā)揮重要作用。</p><p>（2）所以在選用時(shí)應(yīng)根據(jù)有機(jī)廢氣成分的不同，配置不同性質(zhì)及孔徑的分子篩材料，做到有針對(duì)性進(jìn)行有機(jī)廢氣處理，滿足設(shè)計(jì)要求，達(dá)到排放標(biāo)準(zhǔn)。</p><p>分子篩是一類具有均勻微孔，主要由硅、鋁、氧及其它一些金屬陽(yáng)離子構(gòu)成的吸附劑或薄膜類物質(zhì)，其孔徑與一般分子大小相當(dāng)，據(jù)其有效孔徑來(lái)篩分各種流體分子。沸石分子篩是指那些具有分子篩作用的天然及人工合成的晶態(tài)硅鋁酸鹽。沸石分子篩的吸附是一種物理變化過程。產(chǎn)生吸附的原因主要是分子引力作用在固體表面產(chǎn)生的一種“表面力"，當(dāng)流體流過時(shí)，流體中的一些分子由于做不規(guī)則運(yùn)動(dòng)而碰撞到吸附劑表面，在表面產(chǎn)生分子濃聚，使流體中的這種分子數(shù)目減少，達(dá)到分離、清除的目的。由于吸附不發(fā)生化學(xué)變化，只要設(shè)法將濃聚在表面的分子趕跑，沸石分子篩就又具有吸附能力，這一過程是吸附的逆過程，叫解析或再生。由于沸石分子篩孔徑均勻，只有當(dāng)分子動(dòng)力學(xué)直徑小于沸石分子篩孔徑時(shí)才能很容易進(jìn)入晶穴內(nèi)部而被吸附，所以沸石分子篩對(duì)于氣體和液體分子就猶如篩子一樣，根據(jù)分子的大小來(lái)決定是否被吸附。</p><p><br/></p> </div> <div id="4nqxx5o52i" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-986869.html">沸石分子篩具有吸附性能</a></li> <li>下一篇：<a href="/Article-986211.html">沸石和分子篩區(qū)別是什么呢？</a></li> 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