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OALib Journal期刊
ISSN: 2333-9721
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b2o3对ag/tio2-al2o3吸附剂的柴油吸附脱硫性能影响
, PP. 990-997
Keywords: ag基吸附剂,柴油,吸附脱硫,弱酸性位点
Abstract:
？采用浸渍法制备了不同b2o3负载量(e.g.5%~20%(w))的ag/tio2-b2o3-al2o3吸附剂。以含硫量为245.36mg(s)/l的商业柴油作为考察对象,常温常压下采用静态评价进行吸附脱硫性能研究。结果表明,b2o3改性后的ag/tio2-al2o3吸附剂的柴油吸附脱硫活性有了较大提高,当b2o3的负载量为15%时,吸附剂的吸附脱硫活性最高,2%ag/4%tio2-15%b2o3-al2o3(w)的饱和吸附硫容达到2.36mg(s)/g吸附剂。这对于未经预处理的商业柴油而言,吸附脱硫活性已经达到较高水平。采用n2物理吸附、o2化学吸附、x射线衍射(xrd)、nh3程序升温脱附(nh3-tpd)、傅里叶红外光谱(ft-irspectra)、11b核磁共振(11b-nmr)等表征手段对不同负载量b2o3改性ag/tio2-al2o3吸附剂的织构性质、晶相结构和表面酸性的影响进行研究。关联活性测试和表征结果发现,吸附剂的吸附脱硫活性主要与吸附剂的表面弱酸性有关,而b2o3改性在吸附剂表面引入了较多的四配位的bo4物种,能显著增加吸附剂表面弱酸性位点数量,提高吸附剂的吸附脱硫活性。
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