Composites ZSM-5/KIT-6 Synthesized Via Assembly Modification Procedure and Mechanical Grinding Procedure, Respectively, and Their Application to CO.sub.2 Adsorption

• Published in: Water, air, and soil pollution Vol. 228; no. 11
• Main Authors: Lin, Zhifeng, Wei, Jianwen, Geng, Linlin, Mei, Dejun, Liao, Lei
• Format: Journal Article
• Language: English
• Published: Springer 15.10.2017
• Subjects: Adsorption; Zeolites
• ISSN: 0049-6979; 1573-2932
• DOI: 10.1007/s11270-017-3599-7

The micro/mesoporous composite ZSM-5/KIT-6 was synthesized via the assembly procedure of preformed ZSM-5 seeds into mesostructured KIT-6, and mechanical mixtures with different contents of zeolite were prepared via a mechanical grinding procedure. These composites were used as adsorbents for the capture of CO.sub.2 in the simulated flue gas conditions of 60 °C and 15 vol% CO.sub.2 with a thermal gravimetric analyzer (TGA). The combination of dual-pore structures improved the adsorption performance. The composite synthesized via the assembly procedure exhibited superior adsorption capacity to the mechanical mixtures. The maximum adsorption capacity was 1.223 mmol/g. For mechanical mixtures, the adsorption capacity was dependent on the ZSM-5 content and increased with the increase of ZSM-5 content. The composite can be applied for CO.sub.2 adsorption at flue gas temperature and desorption at regeneration temperature of 110 °C. The adsorption capacity showed only 3% attrition during five consecutive cyclic adsorption/desorption tests. The composites displayed excellent CO.sub.2 adsorption/desorption performance.