Simple preparation of tungsten supported carbon nanoreactors for specific applications: Adsorption, catalysis and electrochemical activity
| Autor: | Sang Wook Kim, Suranjana V. Mayani, Vishal J. Mayani |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Inorganic chemistry General Physics and Astronomy chemistry.chemical_element Surfaces and Interfaces General Chemistry Nanoreactor Tungsten Condensed Matter Physics Heterogeneous catalysis Electrocatalyst Surfaces Coatings and Films Catalysis chemistry.chemical_compound Adsorption chemistry Chemical engineering Tungsten carbide Methanol |
| Zdroj: | Applied Surface Science. 345:433-439 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2015.03.178 |
| Popis: | Porous carbon supported tungsten carbide nanoreactors, two sizes (∼25 and 170 nm), were designed using economical petroleum pitch residue followed by tungsten (W) doping. X-ray diffractions showed both carbon tungsten composites (CTC-25 and CTC-170) contained tungsten subcarbide (W 2 C) and monocarbide (WC) as the major and minor crystalline phases, respectively. The present study provides a multiple perspective of carbon tungsten composites (CTCs) for methanol oxidation (as an electrode), adsorption (as an adsorbent) and degradation (as a solid catalyst) of methylene blue (MB). The operational electrodes were designed from both CTCs and used as a catalyst in an electrocatalysis process. The electrocatalysts exhibited high and stable catalytic performance (CTCE-25 > CTCE-170) in methanol electro-oxidation. The newly synthesized W-doped carbon nanoreactors were used successfully as an adsorbent for MB and a heterogeneous catalyst for MB oxidation. Ordered CTC-25 and CTC-170 exhibited dynamic MB adsorption within 15 min and complete oxidation of MB in 25–40 min. A synergetic effect between tungsten carbide and the carbon cage framework was noted. |
| Databáze: | OpenAIRE |
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