Deposition of an ultrathin palladium (Pd) coating on SAPO-34 membranes for enhanced H2/N2 separation. (27th November 2020)

• Record Type: Journal Article
• Authors: Jiang, Ji; Islam, Syed; Dong, Qiaobei; Zhou, Fanglei; Li, Shiguang; Yu, Miao
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 58(2020)
• Page Start: 33648
• Page End: 33656
• Publication Date: 2020-11-27
• Subjects: Zeolite membrane -- H2/N2 separation -- Pd coating -- Pd/SAPO-34 composite membrane; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.09.087
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Hydrogen energy has attracted great attention due to its properties of high energy transferring efficiency and zero pollution emission. Zeolite membranes are promising candidates for H2 separation because of their uniform, molecular-sized pores and high thermal and mechanical stabilities. However, thicker membranes or modification treatments are often necessary to eliminate the defects formed during synthesis and post calcination, leading to low gas permeance. Herein, we reported the deposition of an ultrathin palladium (Pd) coating on SAPO-34 membranes to improve H2 separation performance. H2 /N2 selectivity was greatly increased by deposition of an ultrathin Pd coating on SAPO-34 membranes, while maintaining similar H2 permeance. This might be attributed to the dissociative adsorption and associative desorption of H2 on Pd, as well as fast diffusion of H2 through ultrathin Pd coating. We also noticed that excessive Pd deposition would lead to the formation of cracks on SAPO-34 membranes, leading to deteriorated membrane performance. Highlights: An ultrathin Pd coating was deposited on SAPO–34 membranes. The composite membrane showed enhanced H2 /N2 selectivity. The composite membrane showed comparable H2 permeance to fresh SAPO–34 membrane. The Pd/SAPO–34 composite membrane showed high stability.