Abstract
SSZ-13, with a unique pore structure and excellent thermal stability, showed a potential application in the adsorption and catalysis industry. In this work, Al(NO3)3 was used as an Al source to study the performance and morphology of the zeolite. The zeolite was prepared with an unconventional process by adding an Al source before the structure-directing agent and base. When inorganic oxygen-containing anions were introduced into the unconventional synthesis system, the crystals of the zeolite conform to the unconventional growth mode. The zeolites with large crystals were assembled from small unit nanocrystals. Extending the reaction time, aging time and adding fluoride ions introduced a multistage pore structure on the surface of the molecular sieve, which improved the CO2 adsorption performance. When aging for 24 h, reaction for 96 h, and the amount of fluorine added was 0.05 (F/Si), the sample had the best hierarchical pore structure. The SSZ-13 molecular sieve with an added amount of 0.1 (F/Si) has the highest CO2 adsorption performance. The adsorption amount was 4.55 mmol/g at 1 bar, which is 20.4% higher than that of zeolite SSZ-13 prepared by the conventional process.
Highlights
The CO2 adsorption performance was analyzed with a specific surface area aperture analyzer (V-Sorb-2800P, Gold APP Instruments, Beijing, China) at 298 K, while N2 adsorption/desorption test was conducted at 77 K
Combined with XRD data and SEM images, the synthesis time of the SSZ-13 molecular sieve was shortened to 3 days with the unconventional process
The above results indicated that the SSZ-13 molecular sieve prepared with the unconventional process had significantly better adsorption performance than the SSZ-13 molecular sieve prepared by the conventional process at various pressures, especially under low-pressure conditions
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. SSZ-13 zeolite with three-dimensional eight-membered ring windows (0.38 nm × 0.38 nm) showed preferentially adsorption of CO2 , which is meaningful to the CO2 capture industry. It has a chabazite (CHA) structure with a unique pore structure and excellent thermal stability [4]. It was found that the addition order of synthesis mixture components influenced starting gel pH and mix rheology It affected the crystallinity and phase purity of SAPO catalysts [14]. In order to decrease the synthesis time and adjust the zeolite pore structure, an unconventional feeding sequence with Al source added first was used for the first time, as far as we know. The CO2 adsorption performance was compared with the SSZ-13 prepared by the conventional process
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
