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Properties of Copper Chromite Catalysts in Hydrogenation Reactions
Journal of Catalysis, 1997Abstract A pretreatment involving a 4-h reduction under H2at 573 K, compared to either 473 or 673 K, gave the highest specific activity for furfural and crotonaldehyde hydrogenation over an unpromoted copper chromite catalyst. Both H2and CO chemisorption declined monotonically with increasing reduction temperature, but turnover frequencies also ...
R. Rao +3 more
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Electron Microscopy of Barium-Promoted Copper Chromite
Proceedings, annual meeting, Electron Microscopy Society of America, 1985Copper chromite was reported as an effective catalyst for the hydrogenation of esters to alcohols by Homer Adkins in 1931, and it still remains the catalyst of choice for this reaction. Its most common commercial application is in the hydrogenation of fatty esters to detergent range linear alcohols.
J. B. Hall, J. K. Kouba
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Synthesis and Characterization of Magnesium Copper Chromite Spinels
International Journal of Scientific Research, 2012Various composition of copper magnesium chromite spinels (Cu1-x MgxCr2O4 with x=0, 0.25, 0.5, 0.75, 1.0) were synthesized by co-precipitation method. The catalysts were characterized by various Physico-chemical methods XRD, nitrogen adsorption studies, FT-IR spectroscopy, Thermogravimetric analysis (TG), UV-DRS and Temperature Pro- grammed Desorption ...
Reni George, Sankaran Sugunan
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Composite propellent catalysts: Copper chromate and chromite
Combustion and Flame, 1970The thermal decomposition of copper chromate and chromite has been examined by simultaneous thermogravimetric analysis and differential thermal analysis. The successive stages in the decomposition of the two compounds have been identified, and it has been shown that both ultimately yield cuprous chromite and cuprous oxide.
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Crystal Distortion in Copper Ferrite-Chromite Series
Journal of the Physical Society of Japan, 1961The cation distributions in copper ferrite-chromite series and the copper ferrite quenched from high temperatures are measured by X-ray diffraction method. The lattice parameters are also measured as a function of chromium ion content and of temperature.
Haruyuki Ohnishi, Teruo Teranishi
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Journal of Radioanalytical and Nuclear Chemistry, 2006
Composite solid propellants have been used as fuel in the propulsion of rockets. Transition metal oxides such as copper chromite (CuCr 2 O 4 ) are important catalysts added to the propellants to increase the combustion rates. The content of Cu in samples of copper chromite is normally determined by electrogravimetry and the content of Cr by volumetry ...
F. S. Tagliaferro +3 more
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Composite solid propellants have been used as fuel in the propulsion of rockets. Transition metal oxides such as copper chromite (CuCr 2 O 4 ) are important catalysts added to the propellants to increase the combustion rates. The content of Cu in samples of copper chromite is normally determined by electrogravimetry and the content of Cr by volumetry ...
F. S. Tagliaferro +3 more
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Catalysis Letters, 1992
The causes of the deactivation of catalysts for fuel combustion MeCr2O4/ γ-Al2O3 (Me = Cu or Mg) have been investigated using a variety of complex physical-chemical methods: IRS, ESDR, XPS, TPD and a pulse microcatalytic method. It has been concluded that the observed deactivation of catalysts during fuel combustion is due to the combined effect of ...
D. A. Arendarskii +2 more
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The causes of the deactivation of catalysts for fuel combustion MeCr2O4/ γ-Al2O3 (Me = Cu or Mg) have been investigated using a variety of complex physical-chemical methods: IRS, ESDR, XPS, TPD and a pulse microcatalytic method. It has been concluded that the observed deactivation of catalysts during fuel combustion is due to the combined effect of ...
D. A. Arendarskii +2 more
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Formation of copper chromite in chrome ? Magnesite refractories during service in copper-smelters
Refractories, 1971Copper chromite in chrome — magnesite refractories during service in copper-smelting units can form both on account of free copper oxide separating from the natural chromite without decomposition of the remaining solid solution, and also as a result of the decomposition of the original chromite during its reaction with a mixture of copper oxides and ...
V. M. Ust'yantsev +2 more
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Kinetics of the medium-temperature reduction of copper chromite with hydrogen
Reaction Kinetics and Catalysis Letters, 2004The static volumetric method was used to study the kinetics of copper chromite CuCr2O4 reduction with hydrogen at 50-80 kPa and 498, 523 and 580 K. The rate of copper chromite reduction is maximal initially and decreases monotonically with time. This observation suggests that the reduction is not a topochemical process.
I.I. Simentsova +3 more
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Service of magnesite-chromite refractories in copper-refining furnaces
Refractories, 1966Investigation of magnesite-chromite refractories after service in copper-refining furnaces suggests chemical interaction of copper oxides with components of the refractory: a) periclase and olivine bond (the latter only assumed) forms with oxides of copper, solid solution; b) chrome-spinel forms new compounds of the spinel type Cu2O· Cr2O3 and Cu2O ...
K. V. Vorob'eva, V. A. Perepelitsyn
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