7617-31-4Relevant articles and documents
Tailoring Catalytic Properties of Copper Manganese Oxide Nanoparticles (Hopcalites-2G) via Flame Spray Pyrolysis
Wegner, Karl,Medicus, Maximilian,Schade, Elke,Grothe, Julia,Kaskel, Stefan
, p. 3914 - 3922 (2018/08/06)
Humidity tolerant copper manganese oxide catalysts of the second generation (“Hopcalites-2G”) were produced by flame spray pyrolysis process (FSP) and their catalytic activity for carbon monoxide oxidation under dry and humid conditions was evaluated. The effects of synthesis parameters such as flame specific variables (OFR=oxygen to fuel ratio, sheath gas, reactor) and the precursor specifications (composition, concentration, solvent) were investigated systematically. From the findings of the synthesis variations, it was possible to identify key factors decisive to achieve a high catalytic activity for CO oxidation under humid conditions. The most important characteristics are phase composition, specific surface area and the carbon content to achieve increased long-term stability of the flame made catalysts under humid conditions. A high productivity in the flame-based Hopcalite synthesis was achieved with catalysts performances similar or better than that of the commercial Hopcalite catalyst Carulite 300 (CARUS). The most active catalyst showed 50 % higher CO conversion after one hour on stream at 50 °C and humid conditions compared with the reference. The latter is a crucial step towards an improved humidity tolerance of Hopcalite catalysts in respiratory filter applications.
Ligand chain length conveys thermochromism
Ganguly, Mainak,Panigrahi, Sudipa,Chandrakumar,Sasmal, Anup Kumar,Pal, Anjali,Pal, Tarasankar
, p. 11624 - 11636 (2014/07/22)
Thermochromic properties of a series of non-ionic copper compounds have been reported. Herein, we demonstrate that Cu(ii) ion with straight-chain primary amine (A) and alpha-linolenic (fatty acid, AL) co-jointly exhibit thermochromic properties. In the current case, we determined that thermochromism becomes ligand chain length-dependent and at least one of the ligands (A or AL) must be long chain. Thermochromism is attributed to a balanced competition between the fatty acids and amines for the copper(ii) centre. The structure-property relationship of the non-ionic copper compounds Cu(AL) 2(A)2 has been substantiated by various physical measurements along with detailed theoretical studies based on time-dependent density functional theory. It is presumed from our results that the compound would be a useful material for temperature-sensor applications. This journal is the Partner Organisations 2014.
Synthesis and self-assembly of triangular Cu2-xSe nanocrystals
Tian, Guimin,Zhao, Taotao,Niu, Jinzhong,Shen, Huaibin,Li, Lin Song
, p. 39547 - 39551 (2014/12/09)
High quality triangular Cu2-xSe nanocrystals were successfully synthesized through a green phosphine free route by the non-injection one-pot colloidal approach with Se-octadecene (ODE) as a precursor. CuSt2 was used as reactant and oleylamine (OAM) was used as reaction solvent. By using this new non-injection method, triangle shaped Cu2-xSe nanocrystals with sizes ranging from 2.8 to 12 nm were achieved by simply controlling the reaction time. Transmission electron microscopy (TEM) and high resolution TEM (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and energy dispersive X-ray (EDX) measurements were used to characterize as-synthesized nanocrystals. Cubic berzelianite crystal phase and narrow size distributions were demonstrated by the results. Additionally, the narrow size distribution promoted as-synthesized Cu2-xSe nanocrystals self-assembled into ordered superstructures with the assistance of OAM.
