Fe/Cu-SAPO-11的制备及其NH3吸附性能研究
Preparation and NH3 adsorption performance of Fe/Cu-SAPO-11
为提高NH3在SO2存在时的吸附效率,采用水热法制备SAPO-11,应用离子交换法将Cu修饰于SAPO-11上得到Cu-SAPO-11,随后在其表面掺杂α-Fe2O3,构建出Fe/Cu-SAPO-11,应用于含有SO2的NH3吸附。研究结果表明:分子筛 Cu-SAPO-11整体形貌呈球体结构,直径约7~10 μm,α-Fe2O3掺杂形成的Fe/Cu-SAPO-11整体形貌和孔道结构不变;在修饰与掺杂过程中,分子筛SAPO-11、Cu-SAPO-11、Fe/Cu-SAPO-11比表面积逐步降低,由142 m2/g减少至59 m2/g,且具有弱酸性特征。只有NH3时,分子筛0.2 Fe/Cu-SAPO-11对NH3吸附性能最佳,穿透吸附容量高达1.54 mmol/g,均显著优于未掺杂 α-Fe2O3的Cu-SAPO-11;0.3 Fe/Cu-SAPO-11抗硫吸附性能最佳,吸附容量高达1.21 mmol/g,时间延长至9.96 min。掺杂 α-Fe2O3后,分子筛表面Fe元素先于Cu与SO2发生反应,对NH3吸附行为起到显著调控作用。
To improve the adsorption efficiency of NH3 in the presence of SO2,SAPO-11 was synthesized via a hydrothermal method.Copper (Cu) was introduced onto SAPO-11 by ion exchange to obtain Cu-SAPO-11,followed by the incorporation of α-Fe2O3 onto its surface to construct the Fe/Cu-SAPO-11 composite for NH3 adsorption from SO2-containing streams.The results demonstrate that the Cu-SAPO-11 molecular sieve exhibits a spherical morphology with a diameter of approximately 7-10 μm.The introduction of α-Fe2O3 to form Fe/Cu-SAPO-11 did not alter the overall morphology or the pore structure.During the modification and doping processes,the specific surface areas of SAPO-11,Cu-SAPO-11,and Fe/Cu-SAPO-11 decreased progressively from 142 m2·g-1 to 59 m2·g-1,while all samples retained their weakly acidic characteristics.In the absence of SO2,the 0.2 Fe/Cu-SAPO-11 sample exhibited the best NH3 adsorption performance,achieving a breakthrough adsorption capacity of up to 1.54 mmol·g-1,which was significantly higher than that of the undoped Cu-SAPO-11.In contrast,the 0.3 Fe/Cu-SAPO-11 sample displayed the optimal sulfur-resistant performance,with an adsorption capacity of 1.21 mmol·g-1 and an extended breakthrough time of 9.96 min.The incorporation of α-Fe2O3 ensures that the Fe species on the molecular sieve surface preferentially react with SO2 prior to Cu,thereby playing a crucial role in regulating the NH3 adsorption behavior.
分子筛 / Fe/Cu-SAPO-11 / NH3 / SO2
molecular sieve / Fe/Cu-SAPO-11 / NH3 / SO2
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中国石化重点实验室专项基金项目(KL224017)
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