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- W83974164 abstract "It is difficult to obtain copper in atomic state on the surface of an oxide catalyst. Therefore, the task of achieving metallic copper with a large surface area becomes crucial. Highly dispersed copper can be obtained on the surface via the reduction of copper-containing oxides. The chapter presents an in situ investigation that highlights that the nature of hydrogen interaction with copper chromite depends on the method of reduction. The treatment of a sample preheated at 450–500°C under H2 led to the formation of cuprous chromite, which decomposed to Cu° and -Cr2O3 at higher temperatures. By raising the temperature slowly, a change in the nature of the hydrogen interaction with copper chromite was observed. It was observed that at 200–350°C in hydrogen, copper chromite contained nanometer size metallic copper particles epitaxially bonded to the spinel surface. This state of catalyst exhibited high activity in hydrogenation reactions. X-ray diffraction analysis shows that the parent copper chromite is a spinel phase with a tetragonal distortion of the lattice and a standard cation distribution. Electron microscopy (EM) confirms the formation of well-crystallized spinel particles with crystal sizes from 500–1000 Å. The well-faceted crystals have no noticeable shape anisotropy." @default.
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- W83974164 date "1995-01-01" @default.
- W83974164 modified "2023-09-25" @default.
- W83974164 title "Nanometer size copper particles in copper chromite catalysts" @default.
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- W83974164 doi "https://doi.org/10.1016/s0167-2991(06)81791-x" @default.
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