SO2/NO2 Separation Driven by NO2 Dimerization on SSZ-13 Zeolite Membrane

Ziyi Li; Jun Li; Huazhen Rong; Jiayu Zuo; Xiong Yang; Yi Xing; Yingshu Liu; Guangshan Zhu; Xiaoqin Zou

doi:10.1021/jacs.2c01635

SO₂/NO₂ Separation Driven by NO₂ Dimerization on SSZ-13 Zeolite Membrane

J Am Chem Soc. 2022 Apr 20;144(15):6687-6691. doi: 10.1021/jacs.2c01635. Epub 2022 Apr 6.

Authors

Ziyi Li^{1

2}, Jun Li^{1

2}, Huazhen Rong³, Jiayu Zuo^{1

2}, Xiong Yang^{1

2}, Yi Xing^{1

2}, Yingshu Liu^{1

2}, Guangshan Zhu³, Xiaoqin Zou³

Affiliations

¹ School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China.
² Beijing Higher Institution Engineering Research Center of Energy Conservation and Environmental Protection, Beijing 100083, P. R. China.
³ Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China.

PMID: 35384672
DOI: 10.1021/jacs.2c01635

Abstract

The molecular state is crucial for precise gas separation using a zeolite membrane, yet the state control remains a big challenge. Herein, we report a NO₂ dimerization facilitated high performance SO₂/NO₂ separation on a SSZ-13 zeolite membrane. The NO₂ dimerization is triggered by temperature and pressure to form N₂O₄ with big molecular size, and N₂O₄ diffusion into the zeolite pore is inhibited on the basis of size exclusion, leading to high separation selectivity. Consequently, SO₂ rather than NO₂ preferentially permeates through the SSZ-13 membrane with a high SO₂ permeance of 2 × 10^-7 mol m^-2 s^-1 Pa^-1 and high SO₂/NO₂ separation factor of 22, ∼50-fold of that measured without dimerization. The dimerization effect for SO₂/NO₂ separation prevails in other small-pore zeolites such as NaA. This advanced function is revealed through membrane separation using single and mixture gases.