Research output: Contribution to journal › Article › peer-review
Effect of preparation conditions of nanocrystalline Pd/MgO catalysts on their performance in selective hydrogenation of acetylene. / Ilyina, Ekaterina V.; Yurpalova, Daria V.; Shlyapin, Dmitry A. et al.
In: Molecular Catalysis, Vol. 560, 114151, 2024.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Effect of preparation conditions of nanocrystalline Pd/MgO catalysts on their performance in selective hydrogenation of acetylene
AU - Ilyina, Ekaterina V.
AU - Yurpalova, Daria V.
AU - Shlyapin, Dmitry A.
AU - Veselov, Grigory B.
AU - Shivtsov, Danil M.
AU - Stoyanovskii, Vladimir O.
AU - Bukhtiyarov, Andrey V.
AU - Vedyagin, Aleksey A.
N1 - This study was supported by the Ministry of Science and Higher Education of the Russian Federation within the governmental order for Boreskov Institute of Catalysis (projects No's. FWUR-2024-0034 and FWUR-2024-0039).
PY - 2024
Y1 - 2024
N2 - In the present work, an alkoxide sol-gel method was applied to prepare Pd/MgO catalysts. The sol-gel procedure was followed by supercritical drying (aerogels) or conventional drying (xerogels) in a furnace. These materials were compared with the impregnated samples. The Pd loading was 1 wt% in all the cases. The as-prepared catalysts were characterized by a set of physicochemical methods. Both the type of the Pd precursor and the preparation route were found to affect the porous structure of the materials as well as the dispersion of the palladium particles and their localization over the MgO support. Both the xerogel and incipient wetness impregnation methods lead to a narrower pore size distribution in comparison to the aerogel technique. The most dispersed particles with an average size of ∼ 2.0–2.2 nm were observed for the samples prepared by xerogel and impregnation methods. In the case of aerogel-prepared samples, metallic palladium particles possess bimodal distribution with average diameters of 4.3 and 8.4 nm. The best catalytic performance in acetylene hydrogenation to ethylene (50 % acetylene conversion at 37 °C with selectivity ∼60 %) was observed for the Pd/MgO catalyst prepared via the aerogel route using [Pd(NH3)4](NO3)2. Compared to other samples, this material is characterized by relatively weak metal-support interactions and the availability of active sites for reactants, which ensures the kinetic mode of the hydrogenation reaction (Ea = 74.9 kJ/mol).
AB - In the present work, an alkoxide sol-gel method was applied to prepare Pd/MgO catalysts. The sol-gel procedure was followed by supercritical drying (aerogels) or conventional drying (xerogels) in a furnace. These materials were compared with the impregnated samples. The Pd loading was 1 wt% in all the cases. The as-prepared catalysts were characterized by a set of physicochemical methods. Both the type of the Pd precursor and the preparation route were found to affect the porous structure of the materials as well as the dispersion of the palladium particles and their localization over the MgO support. Both the xerogel and incipient wetness impregnation methods lead to a narrower pore size distribution in comparison to the aerogel technique. The most dispersed particles with an average size of ∼ 2.0–2.2 nm were observed for the samples prepared by xerogel and impregnation methods. In the case of aerogel-prepared samples, metallic palladium particles possess bimodal distribution with average diameters of 4.3 and 8.4 nm. The best catalytic performance in acetylene hydrogenation to ethylene (50 % acetylene conversion at 37 °C with selectivity ∼60 %) was observed for the Pd/MgO catalyst prepared via the aerogel route using [Pd(NH3)4](NO3)2. Compared to other samples, this material is characterized by relatively weak metal-support interactions and the availability of active sites for reactants, which ensures the kinetic mode of the hydrogenation reaction (Ea = 74.9 kJ/mol).
KW - Acetylene hydrogenation
KW - Aerogels
KW - Magnesium oxide
KW - Palladium nanoparticles
KW - Sol-gel synthesis
KW - Xerogels
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85190255362&origin=inward&txGid=cba3d93f8ebe1e55da888a7bc0d2f596
UR - https://www.mendeley.com/catalogue/ecc6d768-5aed-3add-9fff-1f852de61d45/
U2 - 10.1016/j.mcat.2024.114151
DO - 10.1016/j.mcat.2024.114151
M3 - Article
VL - 560
JO - Molecular Catalysis
JF - Molecular Catalysis
SN - 2468-8231
M1 - 114151
ER -
ID: 61051425