TY - JOUR

T1 - Using SAXS for Determining the Sizes of Gold Nanoparticles in Au/C Catalysts: Advantages over Other Methods

AU - Larichev, Yu V.

AU - Moroz, B. L.

AU - Pyrjaev, P. A.

AU - Bukhtiyarov, V. I.

N1 - This study was supported by the Ministry of Science and Higher Education of the Russian Federation (project FSUS-2020-0029) and was performed under the government contract at the Institute of Catalysis, Siberian Branch, Russian Academy of Sciences (project no. AAAA-A21-121011390053-4). We are grateful to E.Yu. Gerasimov, D.A. Zyuzin, and M.S. Mel’gunov for help with performing this research. The SAXS measurements were performed using the equipment provided by the High Technologies and Analysis of Nanosystems (VTAN) Multiaccess Center of Novosibirsk State University. Публикация для корректировки.

PY - 2023/12

Y1 - 2023/12

N2 - The advantages of using SAXS along with the masking liquid technique for determining the sizes of supported metal particles over the standard TEM and XRD methods, usually used for these purposes, were shown in the case of Au/C catalysts. Particle size distributions of gold in a wide range (1–50 nm) were obtained from the SAXS data, including for all size fractions present in the samples. The mass fractions of X-ray amorphous gold particles smaller than 4 nm (W SAXS) were determined. The oxidative treatment of the carbon support before the deposition of the metallic gold precursor complexes has a significant effect on the size distribution of gold particles in the final catalyst. A comparison of the experimental rates of CO oxidation with an excess of moist air at 40°C on Au/C catalysts with the W SAXS values found for these catalysts showed that the catalytic activity increased exponentially as W SAXS increased. The Au/C catalysts with W SAXS ≥ 80% showed high activity in the oxidation of CO.

AB - The advantages of using SAXS along with the masking liquid technique for determining the sizes of supported metal particles over the standard TEM and XRD methods, usually used for these purposes, were shown in the case of Au/C catalysts. Particle size distributions of gold in a wide range (1–50 nm) were obtained from the SAXS data, including for all size fractions present in the samples. The mass fractions of X-ray amorphous gold particles smaller than 4 nm (W SAXS) were determined. The oxidative treatment of the carbon support before the deposition of the metallic gold precursor complexes has a significant effect on the size distribution of gold particles in the final catalyst. A comparison of the experimental rates of CO oxidation with an excess of moist air at 40°C on Au/C catalysts with the W SAXS values found for these catalysts showed that the catalytic activity increased exponentially as W SAXS increased. The Au/C catalysts with W SAXS ≥ 80% showed high activity in the oxidation of CO.

KW - CO oxidation

KW - SAXS

KW - TEM

KW - XRD

KW - carbon

KW - gold nanoparticles

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85179716386&origin=inward&txGid=c0e5a6e0248493bb50824574fa660618

UR - https://www.mendeley.com/catalogue/dec0b4c0-9811-3d11-b2e2-d25e5a311a53/

U2 - 10.1134/S0023158423060083

DO - 10.1134/S0023158423060083

M3 - Article

VL - 64

SP - 882

EP - 894

JO - Kinetics and Catalysis

JF - Kinetics and Catalysis

SN - 0023-1584

IS - 6

ER -