TY - JOUR

T1 - Activation of Nickel Oxide Catalysts Modified with Cobalt, Cerium, Manganese, and Zirconium

AU - Mikhnenko, M. D.

AU - Afonasenko, T. N.

AU - Rogov, V. A.

AU - Bulavchenko, O. A.

N1 - This work was carried out within the framework of a state contract of the Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences (project no. AAAA-A21-121011390011-4). Публикация для корректировки.

PY - 2023/8

Y1 - 2023/8

N2 - The activation of a series of catalysts with the general formula Ni0.9M0.1O (M = Co, Ce, Mn, and Zr) synthesized by coprecipitation and the effect of modifying additives on the phase composition and structure of these catalysts were studied. The effect of additives on the initial state of the samples was studied by X-ray diffraction (XRD) analysis, and their role in the process of NiO reduction was studied using in situ XRD analysis and temperature-programmed reduction with hydrogen (TPR-H2). It was found that the modifiers changed the structure and microstructure of the initial samples to increase the specific surface area and decrease the average coherent scattering region (CSR) sizes of NiO. The introduction of Mn and Co led to the formation of substitutional solid solutions with the oxide NiO. For Ce and Zr, the release of the oxide CeO2 and X-ray amorphous ZrOx was observed. The use of these additives led to an increase in the temperature of NiO reduction to a metallic state compared to that of the massive oxide. In addition, the effect of modifying additives on the particle size of the final metal was revealed. The use of Ce and Mn decreased the average CSR size of Ni by a factor of 2–5 compared to that of massive NiO.

AB - The activation of a series of catalysts with the general formula Ni0.9M0.1O (M = Co, Ce, Mn, and Zr) synthesized by coprecipitation and the effect of modifying additives on the phase composition and structure of these catalysts were studied. The effect of additives on the initial state of the samples was studied by X-ray diffraction (XRD) analysis, and their role in the process of NiO reduction was studied using in situ XRD analysis and temperature-programmed reduction with hydrogen (TPR-H2). It was found that the modifiers changed the structure and microstructure of the initial samples to increase the specific surface area and decrease the average coherent scattering region (CSR) sizes of NiO. The introduction of Mn and Co led to the formation of substitutional solid solutions with the oxide NiO. For Ce and Zr, the release of the oxide CeO2 and X-ray amorphous ZrOx was observed. The use of these additives led to an increase in the temperature of NiO reduction to a metallic state compared to that of the massive oxide. In addition, the effect of modifying additives on the particle size of the final metal was revealed. The use of Ce and Mn decreased the average CSR size of Ni by a factor of 2–5 compared to that of massive NiO.

KW - TPR

KW - activation

KW - in situ XRD analysis

KW - modifying additives

KW - nickel oxide

KW - reduction

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85165556734&origin=inward&txGid=8669a22b9f774a5bdf41db0bcd741668

UR - https://www.mendeley.com/catalogue/2206f8c6-eac4-32d5-8ecd-6633811a946e/

U2 - 10.1134/S0023158423040079

DO - 10.1134/S0023158423040079

M3 - Article

VL - 64

SP - 484

EP - 493

JO - Kinetics and Catalysis

JF - Kinetics and Catalysis

SN - 0023-1584

IS - 4

ER -