catalytic removal of methane over cobalt chromite (cocr2o4) nanospinels for cng vehicles
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abstract
cobalt chromite (cocr2o4) with normal spinel structure, shows catalytic activity for oxidation of unburned methane in the natural gas vehilcles (ngv). in this study, cocr2o4 nanoparticles were synthesized through a conventional co-precipitation technique and investigated for the catalytic combustion of methane. cobalt nitrate hexahydrate, chromium nitrate nonahydrate and ammonia solution (25%) were used as the starting materials. the obtained results show that the cocr2o4 nanospinels were produced as single phase with an average diameter between 25-50 nm.characterization studies by x- ray diffraction (xrd), n2 adsorption/desorption(bet), field emission scanning electron microscopy (fesem), transmission electron microscopy (tem), temperature program oxidation (tpo) and o2- temperature programmed desorption (o2-tpd) were carried out.the specific surface area (sbet) of the synthesized nanoparticles was measured using multiple point brunauer–emmett–teller (bet) method.40 m2.g-1 was obtained for cocr2o4 nanoparticles. the results revealed that cobalt chromite nanoparticles have significant capability for methane conversion at 435oc.
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Journal title:
international journal of nanoscience and nanotechnologyPublisher: iranian nano society
ISSN 1735-7004
volume 11
issue 4 2015
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