TY - JOUR

T1 - Sol–gel synthesis and characterization of the binary Ni–Mg–O oxide system

AU - Karnaukhov, Timofey M.

AU - Vedyagin, Aleksey A.

AU - Cherepanova, Svetlana V.

AU - Rogov, Vladimir A.

AU - Mishakov, Ilya V.

PY - 2019/10/15

Y1 - 2019/10/15

N2 - In this work, the binary Ni–Mg–O oxide system was prepared by means of a sol–gel technique, which provides high dispersity and uniform distribution of the nickel species within the MgO matrix. The samples were characterized by a scanning electron microscopy, a low-temperature nitrogen adsorption, and X-ray diffraction analysis. The reducibility of the prepared samples was tested in the reduction/oxidation cycles, thus modeling the conditions of a chemical looping. It was found that during the preparation procedure, a partial substitution of Mg2+ ions with Ni2+ ions resulting in formation of solid solution takes place. Reduction of the as-prepared sample in a temperature-programmed regime with heating up to 700 °C leads to decomposition of the solid solution and formation of dispersed particles of metallic nickel of 7 nm in size finely distributed within the MgO matrix. Subsequent oxidation transforms Ni0 species into NiO nanoparticles. Starting from the second reduction/oxidation cycle, the binary Ni–Mg–O system shows the reproducible behavior, and thus can be considered as a chemical looping agent.

AB - In this work, the binary Ni–Mg–O oxide system was prepared by means of a sol–gel technique, which provides high dispersity and uniform distribution of the nickel species within the MgO matrix. The samples were characterized by a scanning electron microscopy, a low-temperature nitrogen adsorption, and X-ray diffraction analysis. The reducibility of the prepared samples was tested in the reduction/oxidation cycles, thus modeling the conditions of a chemical looping. It was found that during the preparation procedure, a partial substitution of Mg2+ ions with Ni2+ ions resulting in formation of solid solution takes place. Reduction of the as-prepared sample in a temperature-programmed regime with heating up to 700 °C leads to decomposition of the solid solution and formation of dispersed particles of metallic nickel of 7 nm in size finely distributed within the MgO matrix. Subsequent oxidation transforms Ni0 species into NiO nanoparticles. Starting from the second reduction/oxidation cycle, the binary Ni–Mg–O system shows the reproducible behavior, and thus can be considered as a chemical looping agent.

KW - Characterization

KW - Doping

KW - Nanostructured MgO

KW - Nickel oxide

KW - Reducibility

KW - MIXED OXIDES

KW - CATALYST

KW - GENESIS

KW - RADIATION

KW - HYDROGEN REDUCIBILITY

KW - REDUCTION

KW - KINETICS

KW - GAS

KW - PYROLYSIS

UR - http://www.scopus.com/inward/record.url?scp=85068998591&partnerID=8YFLogxK

U2 - 10.1007/s10971-019-05076-2

DO - 10.1007/s10971-019-05076-2

M3 - Article

AN - SCOPUS:85068998591

VL - 92

SP - 208

EP - 214

JO - Journal of Sol-Gel Science and Technology

JF - Journal of Sol-Gel Science and Technology

SN - 0928-0707

IS - 1

ER -