Effects of Precursor Concentration in Solvent and Nanomaterials Room Temperature Aging on the Growth Morphology and Surface Characteristics of Ni–NiO Nanocatalysts Produced by Dendrites Combustion during SCS

Applied Sciences

Sergey Roslyakov¹  Satheesh Krishnamurthy²  Avishek Dey²  Evgeny Levashov³  Alexandros Chroneos⁴  George Vekinis⁵  Galina Xanthopoulou⁵  Olga Thoda⁵  Nikos Boukos⁵ 

[1] Center of Functional Nano-Ceramics, National University of Science and Technology “MISiS”, 119049 Moscow, Russia;Department of Engineering and Innovation, The Open University, Venables Building, Milton Keynes MK7 6YW, UK;Division of Powder Metallurgy and Functional Coatings, National University of Science and Technology “MISiS” , 119049 Moscow, Russia;Faculty of Engineering, Environment and Computing, Coventry University, Priory Street, Coventry CV1 5FB, UK;Institute of Nanoscience and Nanotechnology, NCSR ‘‘Demokritos”, Agia Paraskevi, 15310 Attiki, Greece;

关键词: scs;    combustion synthesis;    dendrite combustion;    nanomaterial;    nickel-based catalysts;    room temperature aging;    nanomaterials aging;   

DOI  :  10.3390/app9224925

来源: DOAJ

【 摘 要 】

The morphology and surface characteristics of SCS (Solution Combustion Synthesis)-derived Ni−NiO nanocatalysts were studied. The ΤΕΜ results highlighted that the nanomaterial’s microstructure was modified by changing the reactants’ concentrations. The dendrites’ growth conditions were the main factors responsible for the observed changes in the nanomaterials’ crystallite size. Infrared camera measurements demonstrated a new type of combustion through dendrites. The XPS analysis revealed that the NiO structure resulted in the bridging of the oxygen structure that acted as an inhibitor of hydrogen adsorption on the catalytic surface and, consequently, the activity reduction. The RF-IGC indicated three different kinds of active sites with different energies of adsorption on the fresh catalyst and only one type on the aged catalyst. Aging of the nanomaterial was associated with changes in the microstructure of its surface by a gradual change in the chemical composition of the active centers.

【 授权许可】

Unknown