点击次数：

论文类型：期刊论文

发表时间：2017-07-06

发表刊物：INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

收录刊物：SCIE、EI、Scopus

卷号：42

期号：27

页面范围：17102-17111

ISSN号：0360-3199

关键字：Chemical looping reforming; Ethanol; Perovskite; Intelligent oxygen carrier; Strontium substitution

摘要：This work studied an intelligent perovskite of La(2-x)Sr(x)Nia(4-lambda) as oxygen carrier (OC) to produce hydrogen in chemical looping reforming (CLR) process. It was prepared by co-precipitation method and investigated by XRD, TEM, ICP-OES, H-2-TPR, TGA technologies and fixed-bed experiment. The 'intelligence' refers to the self-regeneration ability and structural flexibility of perovskite. The former was verified by the movement that Ni ions repeatedly immerse into and out of perovskite bulk during CLR process. The movement suppressed the growth of Ni particles and maintained its high dispersion. The latter was confirmed by the addition of promoters. The insertion of Sr increased lattice oxygen mobility and greatly strengthened the reversible evolution of metallic Ni, which boosted the carbon-resistance and hold favorable stability of OC. The La1.4Sr0.6NiO4-lambda was the optimized composition owing to the superior activity, higher hydrogen selectivity (87%) and admirable stability. Moreover, shortened 'dead time' and more ideal self-regeneration property of perovskite were attained due to easier reducibility of Ni ions. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.