Hydrogen production by sorption-enhanced steam reforming of acetic acid over Ni/CexZr1−xO2-CaO catalysts. (23rd March 2017)

• Record Type: Journal Article
• Authors: Hu, Rongrong; Li, Danping; Xue, Huiyuan; Zhang, Ni; Liu, Zhongwen; Liu, Zhaotie
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 12(2017)
• Page Start: 7786
• Page End: 7797
• Publication Date: 2017-03-23
• Subjects: Hydrogen production -- Bio-oil -- Sorption-enhanced steam reforming -- Bi-functional catalyst; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.01.167
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The production of high purity hydrogen via the sorption-enhanced steam reforming of acetic acid, a model compound of bio-oil, was investigated in this work. A bi-functional catalyst with stable catalytic activity and CO2 -capture ability, Ni/Cex Zr1−x O2 -CaO, was prepared by a sol–gel method and characterized in details by BET, XRD, TPR and SEM-EDX analytic techniques. The characterization of these materials showed that the catalysts were mainly composed of Ni, Cex Zr1−x O2 and CaO. As CaO loading increased, a new species, CaZrO3, with a perovskite structure was formed. The presence of CaZrO3 in the catalysts acted as a barrier to CaO grain growth at high temperatures and thus improved the CO2 -capture stability. These catalysts exhibited good CO2 sorption capacity in 15 consecutive carbonation–calcination cycles, even at a high calcination temperature of 900 °C. Particularly, in case of the Ni/CZC-2.5 catalyst, 98% high purity H2 could be obtained during the prebreakthrough stage when the catalysts were tested in the SESR of acetic acid at 550 °C with an S/C ratio of 4. In addition, high hydrogen purity was maintained over 15 cyclic reaction-calcination operations, which was mainly attributed to the uniform distribution of Ni, CaO, Cex Zr1−x O2 and CaZrO3 in the catalysts. These results indicated the great potential of the SESR technique for hydrogen production from bio-oil. Highlights: High purity H2 was produced by SESR of acetic acid on Ni/Cex Zr1−x O2 -CaO catalyst. CaZrO3 could retard the sintering of CaO and increase its utilization efficiency. SESR of HAC for cyclic reaction-calcination operations was achieved in one unit.