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High purity hydrogen production via aqueous phase reforming of xylose over small Pt nanoparticles on a gamma-Al2O3 support

Authors
Kim, YoondoKim, MinkyeongJeong, HyangsooKim, YongminChoi, Sun HeeHam, Hyung ChulLee, Seung WooKim, Jin YoungSong, Kwang HoYoon, Chang WonJo, Young SukSohn, Hyuntae
Issue Date
18-5월-2020
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Hydrogen; Xylose; Biomass; APR; Aqueous phase reforming; Platinum
Citation
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.45, no.27, pp.13848 - 13861
Indexed
SCIE
SCOPUS
Journal Title
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume
45
Number
27
Start Page
13848
End Page
13861
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/55666
DOI
10.1016/j.ijhydene.2020.03.014
ISSN
0360-3199
Abstract
In this study, aqueous phase reforming (APR) of xylose was conducted over highly dispersed Pt nanoparticles supported on a gamma-Al2O3 support (Pt-SNP). Formation of small Pt nanoparticles was confirmed by X-ray diffraction and transmission electron microscopy, which revealed that most of the particles ranged between 0.8 and 1.6 nm in size and the average particle size was 1.3 nm. Temperature-programmed reduction analysis indicated that these small Pt nanoparticles were highly reducible under the reducing environment compared to the commercial Pt/gamma-Al2O3 catalysts (Pt-commercial). The catalytic activities of both Pt-SNP and Pt-commercial catalysts were examined in a semi-batch autoclave reactor system for the APR of xylose. It was found that Pt-SNP showed higher carbon to gas conversion with high hydrogen selectivity than Pt-commercial. This was likely due to the increased density of edge sites in the Pt-SNP catalyst that facilitated the cleavage of the C-C bonds rather than the C-O bonds, leading to greater hydrogen production. Furthermore, the Pt-SNP catalyst showed better carbon deposit resistance as compared to Pt-commercial. The amount of carbon deposition on the Pt-SNP catalyst surface and the organic carbon species dissolved in the post-reaction xylose solution were significantly lower compared to that of Pt-commercial. Finally, high purity hydrogen production was achieved using a continuous fixed-bed hybrid reactor including an aqueous phase reformer and a home-made Pd/Ta dense metallic composite membrane. A stable hydrogen gas production (99.999%) was obtained over the Pt-SNP catalyst, which demonstrated the success of a potentially commercial APR reactor system that continuously converted the aqueous xylose solution to hydrogen with high purity. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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