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- Title
Kinetic features of the carbon erosion of a bulk NiCr alloy during the catalytic decomposition of 1,2-dichloroethane.
- Authors
Bauman, Yu.; Mishakov, I.; Vedyagin, A.; Serkova, A.; Gromov, A.
- Abstract
Kinetic features for the carbon erosion (CE) of bulk NiCr alloy (NiCrA, nichrome wire 0.1 mm in diameter) were studied at 450-750°C under conditions of the catalytic decomposition of 1,2-dichloroethane vapor in a reductive atmosphere (H). It was found that the CE process takes place more efficiently in the temperature range from 550 to 720°C, leading to the disintegration of the bulk alloy with the formation of a fibrous carbon product. The apparent activation energy of the process was estimated to be 16.8 ± 0.9 kJ/mol. The realization of CE is hampered outside the optimal temperature range because of chlorination ( T < 500°C) or blocking of the alloy's surface by carbonaceous deposits ( T > 720°C). The kinetics of the process is characterized by the existence of an induction period, whose duration decreases with an increasing temperature (from 40 min at 550°C to 6 min at 710°C). According to scanning and transmission electron microscopy data, the submicron metallic particles (0.2-0.4 μm) catalyzing the growth of carbon fibers with disordered structure result from the disintegration of the NiCr alloy.
- Subjects
NICKEL-chromium alloys; CHEMICAL decomposition; ETHYLENE dichloride; ATMOSPHERE; TEMPERATURE effect
- Publication
Kinetics & Catalysis, 2017, Vol 58, Issue 4, p448
- ISSN
0023-1584
- Publication type
Article
- DOI
10.1134/S0023158417040036