Highly Selective CO2 Separation on Na-exchanged DNL-6 Synthesized by Utilization of Spent Industrial Catalyst

doi:10.1007/s40242-024-4056-y

Abstract

Abstract: Conversion of industrial solid wastes into functional materials has attracted considerable interest, as it can reduce environmental pollution and facilitate the sustainable development of relevant processes. Herein, spent methanol-to-olefins (MTO) industrial catalyst was explored for the synthesis of DNL-6 molecular sieve, a promising SAPO-type adsorbent for CO₂ capture. It was demonstrated that DNL-6 with high purity and crystallinity, and various silica contents can be readily synthesized. Na-exchanged DNL-6 was further prepared using the as-synthesized DNL-6 as the precursor, and its structure was investigated by Rietveld refinement, revealing that Na cations were mainly located in the single 8-rings (S8Rs). Na-DNL-6 with varied silica contents and Na contents were investigated for adsorption studies. Na-DNL-6 with a high Na exchange degree exhibited comparable CO₂ uptake with H-DNL-6 (298 K and 101 kPa), but superior separation selectivity for CO₂/CH₄ (as high as 1369, 50/50 kPa) and CO₂/N₂ (∞, 15/85 kPa) owing to the “trapdoor” effect associated with the Na cations sited in the S8Rs. This work provides an eco-friendly approach for the synthesis of efficient silicoaluminophosphate adsorbent for CO₂ capture.

Key words: DNL-6, SAPO molecular sieve, Synthesis, CO₂ separation, Spent industrial catalyst

TANG Yanling, WANG Quanyi, YAN NaNa, ZHANG Xiaosi, YANG Miao, TIAN Peng, LIU Zhongmin. Highly Selective CO₂ Separation on Na-exchanged DNL-6 Synthesized by Utilization of Spent Industrial Catalyst[J]. Chemical Research in Chinese Universities, 2024, 40(6): 1171-1178.

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Highly Selective CO₂ Separation on Na-exchanged DNL-6 Synthesized by Utilization of Spent Industrial Catalyst

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