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,spen...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 CO_(2) 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 CO_(2) uptake with H-DNL-6(298 K and 101 kPa);but superior separation selectivity for CO_(2)/CH4(as high as 1369,50/50 kPa);CO_(2)/N_(2)(∞,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 CO_(2) capture.展开更多
基金supported by the National Natural Science Foundation of China(Nos.21991090,21991091,22171259,22272173)the AI S&T Program of Yulin Branch,Dalian National Laboratory for Clean Energy,CAS(No.DNL-YL A202206)The authors thank to the funding from the Sino-French IRN(International Research Network).
文摘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 CO_(2) 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 CO_(2) uptake with H-DNL-6(298 K and 101 kPa);but superior separation selectivity for CO_(2)/CH4(as high as 1369,50/50 kPa);CO_(2)/N_(2)(∞,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 CO_(2) capture.
