From pore to process: ultra-efficient SF6/N2 continuous separation using inexpensive robust MOF composites

Author:

Yang Qiwei1ORCID,Li Jinjian1,Chen Yuting1,Ke Tian,Yang Liu1,Zhang Zhiguo1,Ren Qilong1,Bao Zongbi1ORCID

Affiliation:

1. Zhejiang University

Abstract

Abstract

Physisorption presents a promising alternative to cryogenic distillation for capturing the most potent greenhouse gas, SF6, but existing adsorbents face challenges in meeting diverse chemical and engineering concerns. Herein, with insights into in-pore chemistry and industrial process design, we report a systematic investigation that constructed two novel low-cost composites pellets (Al(fum)@2%HPC and Al(fum)@5%Kaolin) coupled with an innovative two-stage Vacuum Temperature Swing Adsorption (VTSA) process for the ultra-efficient recovery of low-concentration SF6 from N2. Record-high selectivities (> 2×104) and SF6 dynamic capacities (~2.7 mmol/g) were achieved, while exceptional SF6 productivities (~58.7 L/kg), yields (~96.8%), and recyclability (~1000 cycles) were demonstrated in fixed-bed adsorption-desorption experiments under mild regeneration conditions. 2D solid-state NMR/in-situ FTIR, DFT-D binding/diffusion simulation analyses revealed the multi-site binding mode and the ultra-fast diffusion of SF6 within the channels. The proposed VTSA processes successfully met the dual stringent requirements of both environmental protection and electricity equipment operation: the SF6 recovery of 99.91% accompanied with a SF6 purity/working capacity of 99.91%/2.1 mmol/g, which significantly outperformed the industrial employed adsorbent zeolite 13X and showed only 19% the energy consumption of the cryogenic distillation.

Publisher

Research Square Platform LLC

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