Hydrogen production on Pd0.01Zn0.29Mg0.7Al2O4 spinel catalyst by low temperature ethanol steam reforming reaction. Issue 4 (August 2019)

• Record Type: Journal Article
• Authors: Lee, Jae Hyung; Do, Jeong Yeon; Park, No-Kuk; Ryu, Ho-Jung; Seo, Myung Won; Kang, Misook
• Is Part Of: Journal of the Energy Institute. Volume 92:Issue 4(2019)
• Page Start: 1064
• Page End: 1076
• Publication Date: 2019-08
• Subjects: Pd0.01Zn0.29Mg0.7Al2O4 -- Spinel structure -- Hydrogen production -- Low temperature ethanol steam reforming -- Water-gas shift reaction; Power (Mechanics) -- Periodicals; Power resources -- Periodicals; Fuel -- Periodicals; 621.04205
• DOI: 10.1016/j.joei.2018.06.010
• Languages: English
• ISSNs: 1743-9671

Abstract

Abstract: This study investigated the low-temperature ethanol steam reforming (LTESR) performance of a Pd0.01 Zn0.29 Mg0.7 Al2 O4 catalyst. Although it was present in a very small amount, the Pd component was the key to the partial CO-water gas shift and CO-methanation that, eventually, helped to increase the yield of H2 during LTESR. An 80% yield of H2 was maintained even after 30 h at 450 °C on the Pd0.01 Zn0.29 Mg0.7 Al2 O4 catalyst with 100% ethanol conversion. Furthermore, the spinel structure of the catalyst remained unchanged after the reaction, and there was no increase in size owing to particle-to-particle aggregation. This study demonstrated that the Pd and Zn components could be stably located in the spinel structure of the MgAl2 O4 with no sintering of the particles. Moreover, the oxygen transfer capacity of the MgAl2 O4 spinel structure helped maintain the catalytic performance for long time periods by transferring oxygen to the reduced catalytic metal species (Zn or Pd) during the reaction, even though this induced oxygen defects in the spinel crystal. Overall, improved catalyst activity and an extended catalyst lifespan were observed. Graphical abstract: Image 1 Highlights: Low temperature ethanol steam reforming performance of spinel structured Pd0.01 Zn0.29 Mg0.7 Al2 O4 catalyst. CO-water gas shift was not promoted on Zn0.3 Mg0.7 Al2 O4 catalyst. Pd provides two keys, the partially CO-WGS and the CO-methanation. H2 yield of 80% was maintained during LTESR for 30 h on Pd0.01 Zn0.29 Mg0.7 Al2 O4 catalyst. Spinel structure of Pd0.01 Zn0.29 Mg0.7 Al2 O4 after ESR did not change.