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Published on: August 25, 2016
Achieving highly selective CO2 adsorption on SAPO-35 zeolites by template-modulating the framework silicon content
Yan Li1, Hongwei Chen2, Chaoran Wang1
1State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University 2699 Qianjin Street Changchun 130012 P. R. China xiaoweisong@jlu.edu.cn jihong@jlu.edu.cn.
This study synthesized silicoaluminophosphate (SAPO)-35 zeolites with tailored acidity for enhanced carbon dioxide (CO2) capture. The optimized SAPO-35_0.14 material demonstrated superior CO2 uptake and selectivity over nitrogen (N2), showing promise for industrial applications.
Area of Science:
- Materials Science
- Adsorption Science
- Chemical Engineering
Background:
- Small-pore silicoaluminophosphate (SAPO) zeolites like SAPO-34 and SAPO-56 are effective for selective CO2 adsorption.
- SAPO-35 zeolites (LEV topology) are less explored for CO2 adsorption due to potential issues with Si content and acidity.
- Tailoring zeolite properties is crucial for optimizing CO2 capture and separation.
Purpose of the Study:
- To synthesize SAPO-35 zeolites with varying Si contents and modulated acidities using N-methylpiperidine (NMP) as a template.
- To investigate the CO2 adsorption and separation performance of the synthesized SAPO-35 zeolites.
- To establish the relationship between zeolite acidity, polarity, and CO2 adsorption/separation capacity.
Main Methods:
- Hydrothermal synthesis of SAPO-35 zeolites with different Si/(Si + P + Al) molar ratios (denoted as SAPO-35_x).
- Characterization of synthesized materials to determine Si content, acidity, and polarity.
- Measurement of CO2 adsorption isotherms and CO2/N2 selectivity using breakthrough experiments.
Main Results:
- SAPO-35_0.14, with the strongest acidity, exhibited the highest CO2 uptake (4.76 mmol g-1 at 273 K and 100 kPa).
- Increased Brønsted acidity significantly enhanced CO2/N2 adsorption selectivity, reaching 49.9 at 298 K and 100 kPa for SAPO-35_0.14.
- Transient breakthrough experiments confirmed the efficient separation performance and stable circulation of SAPO-35_0.14.
Conclusions:
- Framework Si content is critical for regulating the CO2 adsorption performance of SAPO-35 zeolites.
- Modulating silicon content and acidity via template selection is key for synthesizing zeolites with superior CO2 adsorption abilities.
- The study highlights the potential of tailored SAPO-35 zeolites for industrial CO2 capture and separation processes.
