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催化劑顆粒內的擴散

來(lái)源： 時(shí)間：2013-10-18 15:15:53 瀏覽次數：

我們認為在填充床催化不銹鋼反應釜內的反應共有7步。涉及到反應物和產(chǎn)物在催化劑微孔內的擴散。由很細的粉末擠壓而制成的活性較高的催化劑順粒通常具有大量的內表面積。這種順粒是多孔的，并且在順粒內部的活性面積比外表面積要大得多—在某些悄況下要大10,000倍。
我們認為在填充床催化不銹鋼反應釜內的反應共有7步。涉及到反應物和產(chǎn)物在催化劑微孔內的擴散。由很細的粉末擠壓而制成的活性較高的催化劑順粒通常具有大量的內表面積。這種順粒是多孔的，并且在順粒內部的活性面積比外表面積要大得多—在某些悄況下要大10,000倍。當然，反應物成功地到達內表面是必須的，因而這將涉及到微孔內的擴散。
對于在所用的方程式擴散系數裕要仔細地醉酌。假如孔徑是大的或者微孔內的流休的分子密度是高的，那么擴散系數和作了兩個(gè)重要修正的主體流體內的擴散系數相同。，第一個(gè)修正是因為當流體流過(guò)任何微元的截面積時(shí)必須考慮到顆粒的孔隙率。第二個(gè)修正是由于微孔既不是直的，也不是均一的截面積，所以必須引入一個(gè)“曲節因數，
假如考慮一種流體處于中等分子密度范圍，有效擴散系數而是采用更為復雜的表達式。同樣，不能排除在表面吸附層中質(zhì)量傳遞的可能性。當這種情況顯著(zhù)時(shí)，表面吸附必然是大的，而且被吸附的分子必須具有流動(dòng)性。高溫(化學(xué)吸附)不會(huì )發(fā)生這神情況，但是正如在較低溫度時(shí)發(fā)生的，在那里存在的物理吸附，表面擴散也許是很顯著(zhù)的.
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