%0 Journal Article
%T Oxidative regeneration of deactivated binderless 5A molecular sieves for the adsorption-separation of normal hydrocarbons<br>吸附分离正构烃结焦失活的无粘结剂5A分子筛氧化再生研究
%A SUN Hui
%A SHEN Ben-xian
%A LIU Ji-chang
%A <br>孙辉
%A 沈本贤
%A 刘纪昌
%J 燃料化学学报
%D 2009
%I 
%X The deactivation of binderless 5A molecular sieves for the adsorption-separation of normal hydrocarbons was investigated on a fixed bed adsorber. The deactivated molecular sieves were regenerated by removing the coke deposited through oxidation under various conditions. The deactivated molecular sieves exhibited lower surface area (A_(BET)), smaller pore volume (v_p) and larger pore diameter (d_p) than the fresh sample, because certain passages in the molecular sieves were blocked by the coke deposited. With the increase of the coke content in the molecular sieves, the deactivation rate decreased gradually. With the increase of oxidation temperature from 582K to 787K, the coke removal efficiency was elevated from 64% to 100%. At 787K, coke deposited in the molecular sieves was completely removed and the adsorption activity of the molecular sieves was recovered;however, A_(BET) and v_p of the regenerated molecular sieves could not be restored to the original values of the fresh samples. Under 685K～884K, the removal of coke from the binderless 5A molecular sieves by the oxidative treatment could be expressed with a macro-kinetic formula:ln(C_0/C) = 0.013exp(-28122.1/T) (p_(O_2))~(0.32)t.
%K binderless 5A molecular sieves
%K adsorption separation
%K deactivation
%K oxidative regeneration
%K macro-kinetic<br>无粘结剂5A分子筛
%K 吸附分离
%K 失活
%K 氧化再生
%K 宏观动力学
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=6579068328FE643F&jid=C6AB115B41BD2F1616ECDB095B69B8ED&aid=AECE03944F7DF43985E98983C073534A&yid=DE12191FBD62783C&vid=42425781F0B1C26E&iid=B31275AF3241DB2D&sid=7F9B7E84827A650F&eid=547991B346A6585E&journal_id=0253-2409&journal_name=燃料化学学报&referenced_num=0&reference_num=11