title: Enhancing the oxygen permeability of BaCo(0.7)Fe(0.2)Nb(0.1)O(3-δ) membranes by coating GdBaCo(2-x)Fe(x)O(5+δ) for partial oxidation of coke oven gas to syngas.
abstract: The dense ceramic membranes BaCo(0.7)Fe(0.2)Nb(0.1)O(3-δ) (BCFN) combined with GdBaCo(2-x)Fe(x)O(5+δ) (0 ≤ x ≤ 2.0) surface modification layers was investigated for hydrogen production by partial oxidation reforming of coke oven gas (COG). As oxygen permeation of BCFN membrane is controlled by the rate surface exchange kinetics, the GdBaCo(2-x)Fe(x)O(5+δ) materials improve the oxygen permeation flux of the BCFN membrane by 20-44% under helium atmosphere at 750 °C. The maximum oxygen permeation flux reached 14.4 mL min(-1) cm(-2) in the GdBaCoFeO(5+δ) coated BCFN membrane reactor at 850 °C, and a CH(4) conversion of 94.9%, a H(2) selectivity of 88.9%, and a CO selectivity of 99.6% have been achieved. The GdBaCo(2-x)Fe(x)O(5+δ) coating materials possess uniform porous structure, fast oxygen desorption rate and good compatibility with the membrane, which showed a potential application for the surface modification of the membrane reactor.
authors.affiliation: Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Number 275 Mailbox, 149 Yanchang Road, Shanghai 200072, People's Republic of China. hwcheng@shu.edu.cn
authors.forename: Hongwei
authors.initials: H
authors.lastname: Cheng
authors.forename: Jizhong
authors.initials: J
authors.lastname: Liu
authors.forename: Xionggang
authors.initials: X
authors.lastname: Lu
authors.forename: Weizhong
authors.initials: W
authors.lastname: Ding