Production of hydrogen and nano carbon powders from direct plasmalysis of methane

Tsai, Cheng‐Hsien; Chen, Kuan-Ting

doi:10.1016/j.ijhydene.2008.10.061

Cited by 48 publications

(14 citation statements)

References 31 publications

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“…9). A similar spectrum was also found in the previous study [47,48]. Moreover, some atomic lines (N and O) and electronically excited species (NO and N + 2 ) were difficult to observe.…”

Section: Cu 2 O Nanowires Produced By Mw Plasma Reductionsupporting

confidence: 87%

Preparation of Cu2O nanowires by thermal oxidation-plasma reduction method

Chen

Kuo

et al. 2012

Appl. Phys. A

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Facial synthesis of cuprous oxide (Cu 2 O) nanowires by directly heating copper substrates is difficult; however, in this study, it was successfully done by thermal oxidation followed by a plasma reduction process. The preparation of CuO nanowires with an average diameter of 76.2 nm supported on the surface of copper substrate was conducted first in air at 500°C for 3 hrs, and then the CuO nanowires were reduced into Cu 2 O in 15 min using either radio frequency (RF) N 2 plasma or microwave (MW) N 2 plasma. The characteristics of CuO and Cu 2 O nanowires were analyzed using XRD, FE-SEM, and TEM. The results showed that Cu 2 O nanowires can be successfully reduced from CuO nanowires by a simple, promising, and fast nitrogen plasma process. Moreover, in RF plasma, narrower and longer Cu 2 O nanowires can be produced as compared to MW plasma, because energetic N-containing species can reduce the nanowires at a relatively lower temperature.

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“…9). A similar spectrum was also found in the previous study [47,48]. Moreover, some atomic lines (N and O) and electronically excited species (NO and N + 2 ) were difficult to observe.…”

Section: Cu 2 O Nanowires Produced By Mw Plasma Reductionsupporting

confidence: 87%

Preparation of Cu2O nanowires by thermal oxidation-plasma reduction method

Chen

Kuo

et al. 2012

Appl. Phys. A

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“…Currently the catalytic methane steam reforming process is the most well-developed technique for hydrogen production [6]. However, the relatively low specific productivity, large equipment size, and high temperature requirement (600-1000 K), as well as the rapid deactivation of catalysts in the reforming process, still limit its industrial applications, particularly in small-scale distributed and mobile systems where rapid ignition/response is essential [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Plasma activation of methane for hydrogen production in a N2 rotating gliding arc warm plasma: A chemical kinetics study

Zhang

Wang

et al. 2018

Chemical Engineering Journal

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In this work, a chemical kinetics study on methane activation for hydrogen production in a warm plasma, i.e., N 2 rotating gliding arc (RGA), was performed for the first time to get new insights into the underlying reaction mechanisms and pathways. A zero-dimensional chemical kinetics model was developed, which showed a good agreement with the experimental results in terms of the conversion of CH 4 and product selectivities, allowing us to get a better understanding of the relative significance of various important species and their related reactions to the formation and loss of CH 4 , H 2 , and C 2 H 2 etc. An overall reaction scheme was obtained to provide a realistic picture of the plasma chemistry. The results reveal that the electrons and excited nitrogen species (mainly N 2 (A)) play a dominant role in the initial dissociation of CH 4 . However, the H atom induced reaction CH 4 + H → CH 3 + H 2 , which has an enhanced reaction rate due to the high gas temperature (over 1200 K), is the major contributor to both the conversion of CH 4 and H 2 production, with its relative contributions of >90% and >85%, respectively, when only considering the forward reactions. The coexistence and interaction of thermochemical and plasma chemical processes in the rotating gliding arc warm plasma significantly enhance the process performance. The formation of C 2 hydrocarbons follows a nearly one-way path of C 2 H 6 → C 2 H 4 → C 2 H 2 , explaining why the selectivities of C 2 products decreased in the order of C 2 H 2 > C 2 H 4 > C 2 H 6 .

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“…The use of a single-stage, dry methane plasmolysis process has been demonstrated for producing hydrogen and carbon powders at atmospheric-pressure [25]. A microwave torch plasma system was assembled with a maximum stationary power of 5 kW in continuous-wave mode.…”

Section: Microwave Plasmamentioning

confidence: 99%