TY - JOUR

T1 - Methane partial oxidation over porous nickel monoliths

T2 - The effects of NiO-MgO loading on microstructural parameters and hot-spot temperature

AU - Brayko, A. S.

AU - Shigarov, A. B.

AU - Kirillov, V. A.

AU - Kireenkov, V. V.

AU - Kuzin, N. A.

AU - Sobyanin, V. A.

AU - Snytnikov, P. V.

AU - Kharton, V. V.

PY - 2019/2/1

Y1 - 2019/2/1

N2 - Developments of highly efficient catalysts for hydrocarbon fuel conversion have a critical importance for the solid oxide fuel cell (SOFC) technology and hydrogen production. In this work, a series of catalytic monoliths made of porous Ni ribbons with various NiO-MgO loadings were prepared via impregnation with the metal acetates and calcination. The catalysts were tested for the partial oxidation of methane under adiabatic conditions without inlet flow preheating at air excess factors, O-2/(2 center dot CH4), varying in the range 0.3-0.4. When NiO-MgO loading increases, the inlet hot spot temperature was found to exhibit minima reflecting changes of the CH4 reforming rate-determining factors in the catalyst frontal layer. A model describing this unusual phenomenon in terms of the volumetric activity and gas permeability of the porous catalysts, was proposed. The model was validated using experimental results of the catalytic tests, high-resolution transmission electron microscopy and mercury porosimetry. (C) 2018 Elsevier B.V. All rights reserved.

AB - Developments of highly efficient catalysts for hydrocarbon fuel conversion have a critical importance for the solid oxide fuel cell (SOFC) technology and hydrogen production. In this work, a series of catalytic monoliths made of porous Ni ribbons with various NiO-MgO loadings were prepared via impregnation with the metal acetates and calcination. The catalysts were tested for the partial oxidation of methane under adiabatic conditions without inlet flow preheating at air excess factors, O-2/(2 center dot CH4), varying in the range 0.3-0.4. When NiO-MgO loading increases, the inlet hot spot temperature was found to exhibit minima reflecting changes of the CH4 reforming rate-determining factors in the catalyst frontal layer. A model describing this unusual phenomenon in terms of the volumetric activity and gas permeability of the porous catalysts, was proposed. The model was validated using experimental results of the catalytic tests, high-resolution transmission electron microscopy and mercury porosimetry. (C) 2018 Elsevier B.V. All rights reserved.

KW - Interfaces

KW - Methane

KW - Nanoparticles

KW - Partial oxidation

KW - Porous nickel

KW - Structured catalyst

KW - AIR CONVERSION

KW - CATALYTIC PARTIAL OXIDATION

UR - http://www.scopus.com/inward/record.url?scp=85055171748&partnerID=8YFLogxK

U2 - 10.1016/j.matlet.2018.09.175

DO - 10.1016/j.matlet.2018.09.175

M3 - Article

AN - SCOPUS:85055171748

VL - 236

SP - 264

EP - 266

JO - Materials Letters

JF - Materials Letters

SN - 0167-577X

ER -