Kinetics of adsorptive desulfurization over alkaline-treated Beta zeolite

PAN Xingpeng; WU Xiangying; DU Jun; QIAN Mingchao; YU Jiang

doi:10.11949/j.issn.0438-1157.20160245

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Kinetics of adsorptive desulfurization over alkaline-treated Beta zeolite

更新时间：2025-12-10

- Kinetics of adsorptive desulfurization over alkaline-treated Beta zeolite
- CIESC Journal Issue 9, Pages: 3747-3754(2016)
- 作者机构：
  
  北京化工大学化学工程学院,北京,100029
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20160245
  CLC： Q028.3
- Online First：05 September 2016，
  
  Published：05 September 2016
- 稿件说明：
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PAN Xingpeng, WU Xiangying, DU Jun, et al. Kinetics of adsorptive desulfurization over alkaline-treated Beta zeolite[J]. CIESC Journal, 2016, (9): 3747-3754.
DOI：

PAN Xingpeng, WU Xiangying, DU Jun, et al. Kinetics of adsorptive desulfurization over alkaline-treated Beta zeolite[J]. CIESC Journal, 2016, (9): 3747-3754. DOI： 10.11949/j.issn.0438-1157.20160245.

摘要

当吸附质尺寸与分子筛的孔结构尺寸相当时才能进入分子筛的内部，分子筛的孔道尺寸是影响吸附性能的重要因素之一，NaOH溶液处理可实现分子筛孔径的调变，以改善分子筛对吸附质的选择性和扩散传质能力。通过对碱处理后的Beta分子筛进行BET、TEM、FT-IR、XRD和NH3-TPD表征，以考察碱处理对Beta分子筛晶体结构、表面酸性和孔结构参数的影响。碱处理Beta分子筛吸附脱硫的结果显示，碱处理后Beta分子筛吸附量和吸附速率明显增加，尤其动力学尺寸较大的二苯并噻吩吸附量达到了5.06 mg·g-1。吸附动力学研究显示，该吸附过程符合准二级动力学方程，碱处理后分子筛吸附速率常数和粒子内扩散速率常数明显增大，有效地改善了硫化合物在孔道内扩散传质性能，脱硫效率增加。

Abstract

When molecular size of an adsorbate is as large as the pore size of molecular sieves

the adsorbate can enter into the pore structure and thus the pore size of molecular sieves is a critical factor in determining adsorption performance. To improve adsorbate selectivity and diffusion

Beta molecular sieves were modified by alkaline treatment of NaOH solution. The treated Beta molecular sieves were characterized by analytical techniques of BET

TEM

FT-IR

XRD and NH3-TPD to investigate the alkaline treatment process on crystal structure

surface acidity and pore structure. Adsorption desulfurization showed that both adsorption quantity and adsorption rate of alkaline-treated Beta molecular sieves were improved obviously. Especially the adsorption of large-kinetic-sized dibenzothiophene reached to 5.06 mg·g-1. The kinetics of adsorbing dibenzothiophene on Beta molecular sieves was a pseudo-2nd-order adsorption process. After alkaline treatment

rate constants of both adsorption and molecular diffusion inside pores were increased significantly

which in turn improved mass transfer of diffusion inside porous structures and desulfurization efficiency of sulfur compounds.

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