Template Removal and Surface Modification of an SSZ-13 Membrane with Heated Sodium Chloride for CO2/CH4 Gas Separation

He-Li Wang; Mei-Hua Zhu; Ting Wu; Qin-Liang Jiang; Fei Zhang; Ya-Fen Wu; Xiang-Shu Chen

doi:10.1021/acsomega.1c06215

Template Removal and Surface Modification of an SSZ-13 Membrane with Heated Sodium Chloride for CO₂/CH₄ Gas Separation

ACS Omega. 2022 Feb 17;7(8):6721-6727. doi: 10.1021/acsomega.1c06215. eCollection 2022 Mar 1.

Authors

He-Li Wang^{1

2}, Mei-Hua Zhu¹, Ting Wu¹, Qin-Liang Jiang², Fei Zhang¹, Ya-Fen Wu³, Xiang-Shu Chen¹

Affiliations

¹ Institute of Advanced Materials, State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China.
² Energy Institute, Jiangxi Academy of Sciences, Nanchang 330096, P. R. China.
³ Research Department, Jiangxi University of Traditional Chinese Medicine, Nanchang 330004, P. R. China.

Abstract

Hydrothermal synthesis with an organic template of N,N,N trimethyl-1-adamantammonium hydroxide (TMAdaOH) is the most commonly used method to prepare an SSZ-13 zeolite membrane. In this paper, the synthesized membrane was treated in heated sodium chloride to remove TMAdaOH instead of calcination in air. The surface of the membrane was modified by the heated NaCl and resulted in an improved CO₂/CH₄ gas separation selectivity. TMAda⁺ in the channels of SSZ-13 zeolite decomposed completely, and the treatment time was shortened significantly compared with calcination in air. The recrystallization of zeolite reacting with heated NaCl was the possible reason for the improved gas separation performance of the membrane.