title: Synthesis of DNL-6 with a high concentration of Si (4 Al) environments and its application in CO(2) separation.
abstract: The synthesis of DNL-6 with a high concentration of Si (4 Al) environments [Si/(Si+Al+P)=0.182 mol, denoted as M-DNL-6] is demonstrated. This represents the highest reported concentration of such environments in silicoaluminophosphate (SAPO) molecular sieves. Adsorption studies show that the high Si (4 Al) content in M-DNL-6, with an increased number of Brønsted acid sites in the framework, greatly promotes the adsorption of CO(2). M-DNL-6 exhibits a large CO(2) uptake capacity of up to 6.18 mmol g(-1) at 273 K and 101 kPa, and demonstrates high ratios of CO(2)/CH(4) and CO(2)/N(2) separation. From breakthrough and cycling experiments, M-DNL-6 demonstrates the ability to completely separate CO(2) from CH(4) or N(2) with a dynamic capacity of approximately 8.0 wt % before breakthrough. Importantly, the adsorbed CO(2) is easily released from the adsorbent through a simple gas purging operation at room temperature to regain 95 % of the original adsorption capacity. These results suggest that M-DNL-6 can be used as a potential adsorbent for CO(2) capture in pressure swing adsorption processes.
authors.affiliation: Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, PR China.
authors.forename: Xiong
authors.initials: X
authors.lastname: Su
authors.forename: Peng
authors.initials: P
authors.lastname: Tian
authors.forename: Dong
authors.initials: D
authors.lastname: Fan
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Xia
authors.forename: Yue
authors.initials: Y
authors.lastname: Yang
authors.forename: Shutao
authors.initials: S
authors.lastname: Xu
authors.forename: Lin
authors.initials: L
authors.lastname: Zhang
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhang
authors.forename: Dehua
authors.initials: D
authors.lastname: Wang
authors.forename: Zhongmin
authors.initials: Z
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D000393:Air Pollutants / Q000737:chemistry*; D000535:Aluminum / Q000737:chemistry; D002245:Carbon Dioxide / Q000737:chemistry*; D008697:Methane / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry; D033362:Powder Diffraction; D012825:Silicon / Q000737:chemistry; D014961:X-Ray Diffraction; D017641:Zeolites / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D017641:Zeolites; D002245:Carbon Dioxide; D000535:Aluminum; D009584:Nitrogen; D008697:Methane; D012825:Silicon