摘要
考察了Ｐｂ２＋在废ＦＣＣ（流态化催化裂化）催化剂上的吸附热力学特性及动力学特性，探讨了吸附机理，并通过填充床试验，对动态吸附及脱附作了考察。结果表明，等温吸附规律符合Ｌａｎｇｍｕｉｒ和Ｆｒｅｕｎｄｌｉｃｈ模式，吸附呈单分子层形式且易于进行。吸附机理是铅离子通过在废催化剂表面形成羟基络合物和发生离子交换而吸附。颗粒内孔扩散过程为吸附速度的控制步骤，大孔、过渡孔和微孔的孔扩散速度相继减小，在ｑ—ｔ曲线图上分别对应相关性较好的直线。结果还表明，动态吸附操作可行，吸附剂易于再生。
The waste FCC catalyst thermodynamics and kinetics of adsorption to lead were studied. The mechanism for adsorption, dynamic adsorption and desorpion through column test was also inspected. The results show that the adsorption is classified to monomolecular layer type, which can be well described by Langmuir and Freundlich models, and lead cation is easy to be adsorbed by waste FCC catalyst. The mechanism for adsorption is: Pb2+ is adsorbed by cation exchange or formation of hydroxo complex. The controlling step of adsorption velocity is intraparticle diffusion process. The diffusion rates in macropore, transitional pore and micropore which are implied on three linear sections in q- t curves decrease in turn. The dynamic adsorption can be easily carried out by packed bed. The adsorbent is easy to be regenerated.
出处
《石油化工高等学校学报》
EI
CAS
1999年第2期11-14,26,共5页
Journal of Petrochemical Universities
基金
中国石化集团公司资助
关键词
裂化催化剂
铅离子
吸附
废水处理
水处理剂
Waste FCC catalyst
Lead cation
Thermodynamics for adsorption
Desorption
Dynamics
