Highly Selective CO_(2) Separation on Na-exchanged DNL-6 Synthesized by Utilization of Spent Industrial Catalyst  

作　　者：TANG Yanling WANG Quanyi YAN NaNa ZHANG Xiaosi YANG Miao TIAN Peng LIU Zhongmin 

机构地区：[1]School of Chemistry,Dalian University of Technology,Dalian 116024,P.R.China [2]National Engineering Research Center of Lower-Carbon Catalysis Technology,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,P.R.China [3]University of Chinese Academy of Sciences,Beijing 100049,P.R.China

出　　处：《Chemical Research in Chinese Universities》2024年第6期1171-1178,共8页高等学校化学研究（英文版）

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).

摘　　要：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.

关 键 词：DNL-6 SAPO molecular sieve CO_(2)separation Spent industrial catalyst 

分 类 号：O64[理学—物理化学]