Oxidative dehydrogenation of ethane to ethylene by carbon dioxide over Cr/TiO 2 –ZrO 2 nanocatalyst: Effect of active phase and support composition on catalytic properties and performance
| Autor: | Azadeh Talati, Farhad Rahmani, Mohammad Haghighi |
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| Rok vydání: | 2016 |
| Předmět: |
Ethylene
Materials science General Chemical Engineering Inorganic chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Nanomaterial-based catalyst 0104 chemical sciences Catalysis chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials Dehydrogenation Particle size Texture (crystalline) Fourier transform infrared spectroscopy 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | Advanced Powder Technology. 27:1195-1206 |
| ISSN: | 0921-8831 |
| DOI: | 10.1016/j.apt.2016.04.003 |
| Popis: | TiO 2 –ZrO 2 supports with different compositions ranging from 0 to 100 wt.% of ZrO 2 were prepared by co-precipitation method and impregnated with 5 wt.% of Cr 2 O 3 . The synthesized catalysts were characterized by XRD, FESEM, PSD, EDX, BET and FTIR techniques. Characterization studies revealed that the combination of different amounts of TiO 2 and ZrO 2 in the supports had obvious effect on the crystal structure, texture characteristic, and catalytic activity in the oxidative dehydrogenation of ethane to ethylene by carbon dioxide as a soft oxidant. The XRD analysis confirmed the formation of crystalline TiO 2 and/or ZrO 2 in the synthesized samples. The FESEM and EDX images represented the production of homogeneous spherical type agglomerates within the nanometer range and uniform dispersion over the surface of all samples specially CrT75Z25 with an average particle size of about 38 nm. The BET results depicted high surface area of Cr/TiO 2 –ZrO 2 nanocatalysts. The highest catalytic activity and yield (C 2 H 4 yield of 46% as well as 95% ethylene selectivity at 700 °C) were acquired when 75 wt.% TiO 2 and 25 wt.% ZrO 2 were used as the support. It could be attributed to the smaller particles, higher surface area, better dispersion of active phase, and uniform morphology of CrT75Z25. |
| Databáze: | OpenAIRE |
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