Khan, Hassnain Abbas Jung, Kwang-Deog Ahamad, Tansir Ubaidullah, Mohd Imran, Muhammad Alshehri, Saad M. 2024-01-19T15:32:48Z 2024-01-19T15:32:48Z 2022-01-10 2021-01-21 1144-0546 https://pubs.kist.re.kr/handle/201004/117507 The platinum core silica shell catalyst has facilitated stable sulfuric acid decomposition at high-temperature which was not possible over bare Pt nanoparticles due to sintering and agglomeration. Helium (He) gas supplies the heat (550-900 degrees C) in a high temperature gas cooled reactor (VHTR). The major challenge is designing a stable catalyst for the variable heat efficiency of He. Pt catalysts loaded on different supports, such as SiC, Al2O3, SiC-Al2O3, BaSO4, TiO2, SBA-15, and SiO2, have been extensively studied but they have not provided a simple method to form robust catalysts for sulfuric acid decomposition. The core-shell scheme, whereby nanoparticles are enclosed by protecting agents (CTAB) and are covered by a silica shell, delivered mesopores and exhibited higher activity and stability over testing for more than 100 h. TEM images confirmed that the Pt particles on the Pt@mSiO(2) catalyst are more stable during sulfuric acid decomposition, and no significant evidence of agglomeration or sintering of the Pt core particles was found, despite some broken shells and dislocated Pt nanoparticles from the silica core. ICP-OES analysis of the spent catalysts after 100 h showed minimal Pt loss (9.0%). These types of catalysts are highly desirable for practical applications. English ROYAL SOC CHEMISTRY SO3 DECOMPOSITION THERMOCHEMICAL HYDROGEN MESOPOROUS SIO2 GRANULES Pt-core silica shell nanostructure: a robust catalyst for the highly corrosive sulfuric acid decomposition reaction in sulfur iodine cycle to produce hydrogen Article 10.1039/d0nj04830e 1 NEW JOURNAL OF CHEMISTRY, v.45, no.3, pp.1247 - 1252 NEW JOURNAL OF CHEMISTRY 45 3 1247 1252 scie scopus 000611678100013 2-s2.0-85100091780 Chemistry, Multidisciplinary Chemistry Article SO3 DECOMPOSITION THERMOCHEMICAL HYDROGEN MESOPOROUS SIO2 GRANULES Hydrogen VHTR sulfuric acid