Hollow‐Fiber‐Supported Gold and Zirconium‐Doped Faujasite Catalytic Membranes for Hydrogen Purification. Issue 12 (4th September 2017)

• Record Type: Journal Article
• Authors: Zhu, Feng; Peng, Li; Yao, Xun; Zhang, Yuting; Zhang, Chun; Gu, Xuehong
• Is Part Of: Energy technology. Volume 5:Issue 12(2017:Dec.)
• Page Start: 2283
• Page End: 2293
• Publication Date: 2017-09-04
• Subjects: gold -- membranes -- oxidation -- supported catalysts -- zeolites; Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.201700331
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract: Hollow‐fiber‐supported Au‐Zr/faujasite (FAU, NaY) catalytic membranes were prepared and used as a flow‐through catalytic membrane reactor for CO preferential oxidation (CO‐PROX) in H2 ‐rich gas. The catalytic membranes were prepared by the modification of FAU zeolite membranes with Zr 4+ and Au 3+ by ion‐exchange, then activation. The obtained catalytic membranes were characterized by using TEM, X‐ray photoelectron spectroscopy, temperature‐programmed reduction, and temperature‐programmed desorption and their catalytic activity toward CO‐PROX was tested. The results showed that the activation conditions affected the size and oxidation states of the resulting Au nanoparticles strongly, and therefore, affected the catalytic activity strongly. The catalytic activity of the Au nanoparticles can be improved by the doping of Zr to form surface oxygen vacancies and the synergetic effect of Au‐Zr. Meanwhile, the presence of the zeolite framework allows the stabilization of small Au nanoparticles. The Au‐Zr/FAU catalytic membrane prepared under the optimized conditions showed a high catalytic performance (CO conversion above 95 %, turnover frequency>0.4 s −1 ) and outstanding stability (up to 450 h) below 80 °C, which made it a promising candidate for H2 purification. Abstract : Sold on gold : Au‐Zr/FAU catalytic membranes are prepared reproducibly on Al2 O3 hollow fibers to result in a high catalytic activity and long‐term stability. The Zr‐doping and membrane configuration promote the performance of Au nanoparticles for the H2 purification process.