费托合成废渣制备P型分子筛及其应用研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (12): 4501-4511.

费托合成废渣制备P型分子筛及其应用研究

李乔乔, 刘红缨, 张秋雯, 王绿茵, 谭祈祥

中国矿业大学(北京)化学与环境工程学院, 北京 100083

收稿日期:2024-06-14 修订日期:2024-07-25 出版日期:2024-12-15 发布日期:2024-12-19
通信作者: 刘红缨,博士,教授。E-mail:lhying@cumtb.edu.cn
作者简介:李乔乔(2000—),男,硕士研究生。主要从事固废资源化利用的研究。E-mail:2158739352@qq.com
基金资助:
山西省重点研发项目(202102090301006)

Preparation of P-Type Molecular Sieves from Fischer-Tropsch Synthesis Waste Slag and Its Applications

LI Qiaoqiao, LIU Hongying, ZHANG Qiuwen, WANG Lvyin, TAN Qixiang

School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

Received:2024-06-14 Revised:2024-07-25 Published:2024-12-15 Online:2024-12-19

摘要/Abstract

摘要： 工业费托合成工艺路线所产生的废渣含有大量硅和铝元素,为了实现高效资源化利用,本文以除蜡后的费托合成废渣为原料,通过碱熔融-水热法制备P型分子筛,系统考察了硅铝比、碱硅比、晶化温度及晶化时间对P型分子筛制备的影响,采用XRD、FT-IR、SEM等表征手段对分子筛进行晶型、形貌和结构分析,并对P型分子筛吸附Pb²⁺性能进行了研究。结果表明:废渣在n(SiO₂)/n(Al₂O₃)=6.5,n(Na₂O)/n(SiO₂)=1.8、T=90 ℃和t=24 h条件下合成的P型分子筛,形貌轮廓清晰、形状规则,无杂质晶相,相对结晶度最高,达86.39%,且比表面积最大,达99.8 m²/g。费托合成废渣基P型分子筛对Pb²⁺的最大平衡吸附容量达322.85 mg,对吸附过程进行吸附动力学分析发现其符合准二级动力学模型,吸附平衡量为319.47 mg/g。

关键词: 费托合成废渣, P型分子筛, 碱熔融-水热法, Pb²⁺吸附, 动力学模型, 吸附容量

Abstract: In order to realize the efficient resource utilization of industrial Fischer-Tropsch synthesis process, P-type molecular sieves were prepared from Fischer-Tropsch synthesis residue with a lot of silicon and aluminum after dewaxing by alkali-fusion-hydrothermal method. The effects of Si/Al ratio, alkali/Si ratio, crystallization temperature and crystallization time on the preparation of P-type molecular sieves were systematically investigated. XRD, FT-IR, SEM and other characterization means were used to analyze the crystalline shape, morphology and structure of the molecular sieves, and the adsorption properties of P-type molecular sieves with Pb²⁺ were investigated. The results show that the P-type molecular sieves synthesized from waste slag under the conditions of n(SiO₂)/n(Al₂O₃)=6.5, n(Na₂O)/n(SiO₂)=1.8, T=90 ℃, and t=24 h have a clear and regular morphology profile, no impurity crystalline phases, the highest degree of crystallinity, which is 86.39%, and the largest specific surface area, which is 99.8 m²/g. The maximum equilibrium adsorption capacity of Pb²⁺ in the Fischer-Tropsch synthesis waste slag-based P-type molecular sieves reaches 322.85 mg. The adsorption process is analyzed for adsorption kinetics and it is found that the process conformed to a quasi-secondary kinetic model with an adsorption equilibrium of 319.47 mg/g.

Key words: Fischer-Tropsch synthesis waste slag, P-type molecular sieve, alkali-fusion-hydrothermal method, Pb²⁺ adsorption, kinetic model, adsorption capacity

中图分类号:

TQ170
X705

李乔乔, 刘红缨, 张秋雯, 王绿茵, 谭祈祥. 费托合成废渣制备P型分子筛及其应用研究[J]. 硅酸盐通报, 2024, 43(12): 4501-4511.

LI Qiaoqiao, LIU Hongying, ZHANG Qiuwen, WANG Lvyin, TAN Qixiang. Preparation of P-Type Molecular Sieves from Fischer-Tropsch Synthesis Waste Slag and Its Applications[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(12): 4501-4511.

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