TY - JOUR

T1 - Comprehensive structural diagnostics of Ni–Ce1–xZr xO2 catalysts prepared by the Pechini method

AU - Pakharukova, V. P.

AU - Stonkus, O. A.

AU - Kharchenko, N. A.

AU - Rogozhnikov, V. N.

AU - Gorlova, A. M.

AU - Potemkin, D. I.

N1 - Funding Information: This work was funded by the Russian Science Foundation, project No. 21-73-20075. Publisher Copyright: © 2022, Pleiades Publishing, Ltd.

PY - 2022/9

Y1 - 2022/9

N2 - Nickel-containing catalysts Ni/Ce1–xZrxO2 exhibit good activity in the methanation of carbon oxides. The studies devoted to the synthesis and testing of Ni–Ce–Zr–O mixed oxide catalytic systems have been developed in recent years. However, the possibility of preparing solid solutions Ni–Ce–Zr–O is still not clear. In this work, Ni–Ce1–xZrxO2 catalysts are synthesized using the Pechini method that has a proven effectiveness in the preparation of mixed oxides. Structural features of the samples are studied by a wide range of powder diffraction and transmission electron microscopy methods, as well as by the atomic pair distribution analysis. The obtained results prove the possibility of preparing the fluorite-like Ni–Ce–Zr–O substitutional solid solution. The crystal structure of this solution is distorted due to the differences between characteristic coordinations and the radii of nickel, cerium, and zirconium cations. It is shown that the Ni–Ce–Zr–O solid solution with a “strained” defective crystal structure is not stable and decomposes under reducing conditions of methanation of carbon oxides to form fine metallic nickel particles.

AB - Nickel-containing catalysts Ni/Ce1–xZrxO2 exhibit good activity in the methanation of carbon oxides. The studies devoted to the synthesis and testing of Ni–Ce–Zr–O mixed oxide catalytic systems have been developed in recent years. However, the possibility of preparing solid solutions Ni–Ce–Zr–O is still not clear. In this work, Ni–Ce1–xZrxO2 catalysts are synthesized using the Pechini method that has a proven effectiveness in the preparation of mixed oxides. Structural features of the samples are studied by a wide range of powder diffraction and transmission electron microscopy methods, as well as by the atomic pair distribution analysis. The obtained results prove the possibility of preparing the fluorite-like Ni–Ce–Zr–O substitutional solid solution. The crystal structure of this solution is distorted due to the differences between characteristic coordinations and the radii of nickel, cerium, and zirconium cations. It is shown that the Ni–Ce–Zr–O solid solution with a “strained” defective crystal structure is not stable and decomposes under reducing conditions of methanation of carbon oxides to form fine metallic nickel particles.

KW - atomic pair distribution function analysis

KW - catalysts

KW - cerium dioxide

KW - electron microscopy

KW - nickel

KW - powder X-ray diffraction

KW - solid solutions

UR - http://www.scopus.com/inward/record.url?scp=85139416033&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/5fba2933-f71f-3b03-b90a-51ced6f1435f/

U2 - 10.1134/S0022476622090050

DO - 10.1134/S0022476622090050

M3 - Article

AN - SCOPUS:85139416033

VL - 63

SP - 1424

EP - 1433

JO - Journal of Structural Chemistry

JF - Journal of Structural Chemistry

SN - 0022-4766

IS - 9

ER -