Hβ/OMC的制备及吸附脱硫研究

Preparation of Hβ/OMC and Adsorption Desulfurization

将介孔碳(OMC)与Hβ分子筛复合,制备了复合型吸附脱硫剂Hβ/OMC。采用XRD、BET、FTIR、SEM和TEM等手段对其进行表征,以苯并噻吩(BT)为探针分子,考察了Hβ/OMC的吸附脱硫性能,研究了Hβ/OMC分子筛吸附BT的热力学和动力学规律。结果表明,Hβ/OMC具有微介孔结构,其比表面积、孔容及孔径均高于OMC;Hβ/OMC对BT的饱和吸附硫容量高于OMC;与Freundlich吸附等温模型相比,BT在Hβ/OMC上的吸附更符合Langmuir模型;Hβ/OMC对BT的吸附是自发、放热、混乱程度降低的过程,采用拟二级动力学方程比拟一级动力学方程对吸附过程描述得更好。

The composite material Hβ/OMC containing the mesoporous carbon(OMC)and Hβzeolite was synthesized.This composite was characterized with XRD,BET,FITR,SEM and TEM.The adsorption desulfurization performance of Hβ/OMC was investigated with benzothiophene(BT)as the probe molecule.The adsorption thermodynamics and kinetics of the BT on Hβ/OMC were studied.The characterization results showed that Hβ/OMC has the micro mesoporous hierarchical pore structure,its specific surface area,pore volume and pore diameter are all higher than those of OMC.The saturated sulfur capacity of BT on Hβ/OMC is higher than OMC.Compared with Freundlich adsorption isotherm model,the adsorption of BT on Hβ/OMC is more consistent with Langmuir model.The adsorption of BT on Hβ/OMC is a process of spontaneous,exothermic and degree of confusion reduction,which is described better by pseudo two kinetic equations than pseudo one kinetic equations.