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无模板剂多级孔Ni-ZSM-5分子筛制备及其吸附噻吩性能
1.河南大学化学化工学院,河南 开封 475004; 2.河南省废弃物资源能源化工程技术研究中心,河南 开封 475004
Adsorptive Performance of Template-Free Hierarchical Ni-ZSM-5 Zeolite
1. College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China; 2. Henan Engineering Research Center of Resource and Energy Recovery from Waste, Kaifeng 475004, China
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摘要 采用无模板剂法制备了多级孔Ni-ZSM-5分子筛,通过X射线衍射(XRD)、扫描电镜(SEM)、红外光谱(FTIR)、N2吸附-脱附和NH3程序升温脱附(NH3-TPD)等方法表征分子筛晶体结构、形貌、孔结构参数及表面酸性。以噻吩为模型分子考察了分子筛吸附性能,并进行了吸附热力学和吸附动力学分析。结果表明,无模板剂多级孔Ni-ZSM-5分子筛的吸附量高于微孔ZSM-5分子筛和多级孔ZSM-5分子筛吸附量,吸附噻吩过程受到扩散及化学吸附两方面因素影响。在Ni-ZSM-5分子筛表面吸附是单分子层占主导地位的化学吸附,303 K时,最大吸附硫容为0.342 mmol/g;该吸附过程符合准n级动力学模型,级数为1.5。
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汤雁婷1
2
杨 洋1
袁世阳1
张笑娟1
马新起1
2
张锡兰1
2
郭泉辉1
2
关键词 多级孔Ni-ZSM-5分子筛无模板剂吸附动力学    
Abstract:Hierarchical Ni-ZSM-5 zeolites were prepared by template-free method. The crystal structure, morphology, pore structure parameters and surface acidity of zeolites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier infrared spectroscopy (FTIR), N2 adsorption-desorption and NH3 temperature-programmed desorption (NH3-TPD). The adsorption performance of zeolites was investigated using thiophene as model molecule and the adsorption thermodynamics and kinetics were analyzed. The results showed that the adsorption capacity of the hierarchical Ni-ZSM-5 zeolites was significantly higher than that of the microporous ZSM-5 and hierarchical ZSM-5 zeolites, and the adsorption process was affected by both diffusion and chemical adsorption. The adsorption thermodynamics indicated that the adsorption of thiophene on the surface of Ni-ZSM-5 zeolites was the dominant chemical adsorption of monolayer, and the maximum adsorption sulfur capacity was 0.342 mmol/g at 303 K. The adsorption kinetics study showed that the adsorption process conformed to the quasi-n-order kinetic model with a grade of 1.5.
Key wordshierarchical    Ni-ZSM-5 zeolite    template-free    adsorption    kinetics   
收稿日期: 2019-04-11     
基金资助:河南省科技发展计划项目(202102310606);河南省教育厅项目(15A530005,15A530006)。
作者简介: 汤雁婷(1986—),女,博士;郭泉辉(1972—),男,副教授,通讯联系人。E-mail: qhguo@henu.edu.cn。
引用本文:   
汤雁婷1,2,杨 洋1等. 无模板剂多级孔Ni-ZSM-5分子筛制备及其吸附噻吩性能[J]. 化学反应工程与工艺, 2019, 35(3): 266-273.
TANG Yanting1,2,YANG Yang1 et al. Adsorptive Performance of Template-Free Hierarchical Ni-ZSM-5 Zeolite[J]. 化学反应工程与工艺, 2019, 35(3): 266-273.
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