Kim, Yoondo Kim, Minkyeong Jeong, Hyangsoo Kim, Yongmin Choi, Sun Hee Ham, Hyung Chul Lee, Seung Woo Kim, Jin Young Song, Kwang Ho Yoon, Chang Won Jo, Young Suk Sohn, Hyuntae 2024-01-19T17:32:25Z 2024-01-19T17:32:25Z 2021-09-05 2020-05-18 0360-3199 https://pubs.kist.re.kr/handle/201004/118613 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. English PERGAMON-ELSEVIER SCIENCE LTD SUPERCRITICAL WATER GASIFICATION OXYGENATED HYDROCARBONS RENEWABLE HYDROGEN METAL DISPERSION ETHYLENE-GLYCOL SOL-GEL BIOMASS CATALYSTS CONVERSION OXIDATION High purity hydrogen production via aqueous phase reforming of xylose over small Pt nanoparticles on a gamma-Al2O3 support Article 10.1016/j.ijhydene.2020.03.014 1 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.45, no.27, pp.13848 - 13861 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 45 27 13848 13861 scie scopus 000530094600008 2-s2.0-85082736696 Chemistry, Physical Electrochemistry Energy & Fuels Chemistry Electrochemistry Energy & Fuels Article SUPERCRITICAL WATER GASIFICATION OXYGENATED HYDROCARBONS RENEWABLE HYDROGEN METAL DISPERSION ETHYLENE-GLYCOL SOL-GEL BIOMASS CATALYSTS CONVERSION OXIDATION Hydrogen Xylose Biomass APR Aqueous phase reforming Platinum