费托合成废渣制备P型分子筛及其应用研究  

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

作　　者：李乔乔 刘红缨[1] 张秋雯 王绿茵 谭祈祥 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)

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《硅酸盐通报》2024年第12期4501-4511,共11页Bulletin of the Chinese Ceramic Society

基　　金：山西省重点研发项目(202102090301006)。

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Pb^(2+)性能进行了研究。结果表明:废渣在n(SiO_(2))/n(Al_(2)O_(3))=6.5,n(Na_(2)O)/n(SiO_(2))=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 m^(2)/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。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 Pb^(2+)were investigated.The results show that the P-type molecular sieves synthesized from waste slag under the conditions of n(SiO_(2))/n(Al_(2)O_(3))=6.5,n(Na_(2)O)/n(SiO_(2))=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 m^(2)/g.The maximum equilibrium adsorption capacity of Pb^(2+)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.

关 键 词：费托合成废渣 P型分子筛 碱熔融-水热法 Pb^(2+)吸附 动力学模型 吸附容量 

分 类 号：TQ170[化学工程—硅酸盐工业] X705[环境科学与工程—环境工程]