Nickel; methanation; self-regeneration; perovskite-type oxides; CO2; carbon deposition; spectroscopy; diffraction
Clark Adam H., Steiger Patrick, Bornmann Benjamin, Hitz Stephan, Frahm Ronald, Ferri Davide, Nachtegaal Maarten (2020), Fluorescence-detected quick-scanning X-ray absorption spectroscopy, in Journal of Synchrotron Radiation
, 27(3), 1.
Steiger Patrick, Kröcher Oliver, Ferri Davide (2020), Increased nickel exsolution from LaFe0.8Ni0.2O3 perovskite-derived CO2 methanation catalysts through strontium doping, in Applied Catalysis A: General
, 590, 117328.
Ferri Davide, Pergolesi Daniele, Fabbri Emiliana (2019), Energy Conversion Processes with Perovskite-type Materials, in CHIMIA International Journal for Chemistry
, 73(11), 913-921.
Steiger Patrick, Burnat Dariusz, Kröcher Oliver, Heel Andre, Ferri Davide (2019), Segregation of Nickel/Iron Bimetallic Particles from Lanthanum Doped Strontium Titanates to Improve Sulfur Stability of Solid Oxide Fuel Cell Anodes, in Catalysts
, 9(4), 332-332.
Steiger Patrick, Alxneit Ivo, Ferri Davide (2019), Nickel incorporation in perovskite-type metal oxides – Implications on reducibility, in Acta Materialia
, 164, 568-576.
Steiger Patrick, Burnat Dariusz, Madi Hossein, Mai Andreas, Holzer Lorenz, Van Herle Jan, Kröcher Oliver, Heel Andre, Ferri Davide (2019), Sulfur Poisoning Recovery on a Solid Oxide Fuel Cell Anode Material through Reversible Segregation of Nickel, in Chemistry of Materials
, 31(3), 748-758.
Pereñíguez Rosa, Ferri Davide (2018), Structural Reversibility of LaCo1-xCuxO3 Followed by In Situ X-ray Diffraction and Absorption Spectroscopy, in ChemPhysChem
, 19(15), 1876-1885.
Steiger Patrick, Nachtegaal Maarten, Kröcher Oliver, Ferri Davide (2018), Reversible segregation of Ni in LaFe0.8Ni0.2O3±δ during coke removal, in ChemCatChem
, 10, 4456.
Pereniguez Rosa, Caballero Alfonso, Ferri Davide (2017), Preferential oxidation of CO on a La-Co-Ru perovskite-type oxide catalyst, in Catalysis Communications
, 92, 75.
Steiger Patrick, Delmelle Renaud, Foppiano Debora, Holzer Lorenz, Heel Andre, Nachtegaal Maarten, Kröcher Oliver, Ferri Davide (2017), Structural Reversibility and Nickel Particle stability in Lanthanum Iron Nickel Perovskite-Type Catalysts, in ChemSusChem
, 10, 2505.
Catalyst deactivation is a key issue in catalyst development. Numerous catalytic processes are limited by deactivation due for example to growth and/or loss of the active metal phase as well as poisoning due to carbon formation or deposition of elements, e.g. sulfur or phosphorous. The principal aim of the project is to understand and apply the self-regenerating function of perovskite-type oxides in order to counteract catalyst deactivation due to microstructural changes of the active phase particles and simultaneous carbon deposition (coking).Perovskite-type oxides are able to segregate metal atoms out of their crystal structure under reducing conditions and to reversibly introduce them into the structure under oxidizing conditions. The major implication of this function is the preservation of the metal particle size from particle growth upon exposure to high operation temperature and reducing environment that is encountered in various catalytic processes. The utility of this function has not been demonstrated for applications other than environmental catalysis. In this project, we aim at demonstrating that this function can be exploited in a similar way to produce active and stable catalysts based on Ni, which is common in a number of applications. The approach is based on the synthesis of a perovskite-type phase in which the active metal only partially substitutes the B-site cation, is homogeneously dispersed and adopts the octahedral coordination environment. Under pre-reduction, or alternately under the reducing conditions imposed by net reducing reaction conditions, the active metal is forced to segregate and to form metal nanoparticles. After oxidation at the same or higher temperature, the active metal phase is protected by re-incorporation into the perovskite-type structure until the next reduction step is applied. CO2 hydrogenation is selected as the probe reaction, since it is a catalytic process under net reducing conditions and moderate but elevated temperatures. Ni is the typical active metal in the form of nanoparticles, which undergoes deactivation due to particle growth and/or coking. Coking is substantially accelerated by the presence of hydrocarbons in the reactants feed.We will try to demonstrate that this function can have a broader range of applicability in catalytic processes, especially at low temperature.