Balancing the Kinetic and Thermodynamic Synergetic Effect of Doped Carbon Molecular Sieves for Selective Separation of C 2 H 4 /C 2 H 6 .

Autor: Liu RS; State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Liaoning Key Laboratory for Catalytic Conversion of Carbon Resources, and School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, P. R. China., Wang M; State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Liaoning Key Laboratory for Catalytic Conversion of Carbon Resources, and School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, P. R. China., Li WC; State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Liaoning Key Laboratory for Catalytic Conversion of Carbon Resources, and School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, P. R. China., Zhang XJ; State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Liaoning Key Laboratory for Catalytic Conversion of Carbon Resources, and School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, P. R. China., Wang CT; State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Liaoning Key Laboratory for Catalytic Conversion of Carbon Resources, and School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, P. R. China., Hao GP; State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Liaoning Key Laboratory for Catalytic Conversion of Carbon Resources, and School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, P. R. China., Lu AH; State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Liaoning Key Laboratory for Catalytic Conversion of Carbon Resources, and School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, P. R. China.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Sep; Vol. 20 (38), pp. e2401965. Date of Electronic Publication: 2024 May 13.
DOI: 10.1002/smll.202401965
Abstrakt: Selective separation of ethylene and ethane (C 2 H 4 /C 2 H 6 ) is a formidable challenge due to their close molecular size and boiling point. Compared to industry-used cryogenic distillation, adsorption separation would offer a more energy-efficient solution when an efficient adsorbent is available. Herein, a class of C 2 H 4 /C 2 H 6 separation adsorbents, doped carbon molecular sieves (d-CMSs) is reported which are prepared from the polymerization and subsequent carbonization of resorcinol, m-phenylenediamine, and formaldehyde in ethanol solution. The study demonstrated that the polymer precursor themselves can be a versatile platform for modifying the pore structure and surface functional groups of their derived d-CMSs. The high proportion of pores centered at 3.5 Å in d-CMSs contributes significantly to achieving a superior kinetic selectivity of 205 for C 2 H 4 /C 2 H 6 separation. The generated pyrrolic-N and pyridinic-N functional sites in d-CMSs contribute to a remarkable elevation of Henry selectivity to 135 due to the enhancement of the surface polarity in d-CMSs. By balancing the synergistic effects of kinetics and thermodynamics, d-CMSs achieve efficient separation of C 2 H 4 /C 2 H 6 . Polymer-grade C 2 H 4 of 99.71% purity can be achieved with 75% recovery using the devised d-CMSs as reflected in a two-bed vacuum swing adsorption simulation.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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