Ni–M–O (M = Sn, Ti, W) Catalysts Prepared by a Dry Mixing Method for Oxidative Dehydrogenation of Ethane
| Autor: | Moussab Harb, Jean-Marie Basset, Mohamed N. Hedhili, Devon C. Rosenfeld, Zhu Haibo, Samy Ould-Chikh, Dalaver H. Anjum |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Non-blocking I/O Inorganic chemistry Nanoparticle 02 engineering and technology General Chemistry Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences Metal Adsorption visual_art visual_art.visual_art_medium Dehydrogenation 0210 nano-technology Solid solution |
| Zdroj: | ACS Catalysis. 6:2852-2866 |
| ISSN: | 2155-5435 |
| Popis: | A new generation of Ni–Sn–O, Ni–Ti–O, and Ni–W–O catalysts has been prepared by a solid-state grinding method. In each case the doping metal varied from 2.5% to 20%. These catalysts exhibited higher activity and selectivity for ethane oxidative dehydrogenation (ODH) than conventionally prepared mixed oxides. Detailed characterization was achieved using XRD, N2 adsorption, H2-TPR, SEM, TEM, and HAADF-STEM in order to study the detailed atomic structure and textural properties of the synthesized catalysts. Two kinds of typical structures are found in these mixed oxides, which are (major) “NixMyO” (M = Sn, Ti, W) solid solution phases (NiO crystalline structure with doping atom incorporated in the lattice) and (minor) secondary phases (SnO2, TiO2, or WO3). The secondary phase exists as a thin layer around small “NixMyO” particles, lowering the aggregation of nanoparticles during the synthesis. DFT calculations on the formation energies of M-doped NiO structures (M = Sn, Ti, W) clearly confirm the thermodynam... |
| Databáze: | OpenAIRE |
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