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Research Papers: Energy Systems Analysis

Hydrogen Production by Carbon-Catalyzed Methane Decomposition Via Thermogravimetry

[+] Author and Article Information
Vidyasagar Shilapuram

Chemical Engineering Department,
National Institute of Technology, Warangal,
Warangal, Telangana 506004, India
e-mail: vidyasagars@nitw.ac.in

Nesrin Ozalp

Department of Mechanical and
Industrial Engineering,
University of Minnesota Duluth,
Duluth, MN 55812
e-mail: nozalp@d.umn.edu

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received September 19, 2015; final manuscript received October 25, 2016; published online November 29, 2016. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 139(1), 012005 (Nov 29, 2016) (8 pages) Paper No: JERT-15-1353; doi: 10.1115/1.4035145 History: Received September 19, 2015; Revised October 25, 2016

Hydrogen is a high energy content fuel and methane is currently the most preferred feedstock for hydrogen production. Direct thermal splitting of methane offers the cleanest technique to produce hydrogen and carbon as coproduct fuel. Carbonaceous catalysts have significant impact on methane to hydrogen conversion. This study presents thermogravimetric experiment results of carbon-catalyzed methane decomposition using commercial catalyst. Results are presented in terms of carbon formation rate, amount of carbon deposition on the catalyst, sustainability factor, catalyst activity, and kinetics of the reaction. The results show that weight gain because of carbon formation depends on reaction temperature, methane volume percent in the feed gas, and nature of the carbonaceous catalyst. It was observed that the reaction rate was dominant at the beginning, and deactivation rate was dominant toward the end of reaction. X-ray diffraction (XRD) and scanning electron microscopic (SEM) analysis of deactivated catalytic samples show decreasing disorder with increasing reaction temperature. Finally, performance comparison of activated carbons (ACs) studied in literature shows that activated carbon sample chosen in this study outperforms in terms of carbon deposition, reaction rate, carbon weight gain, and sustainability factor.

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Figures

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Fig. 1

Evolution of carbon deposition by change in temperature

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Fig. 2

Evolution of carbon deposition by change in methane volume percent

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Fig. 3

Initial rate of reaction versus temperature at different methane volume percent

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Fig. 4

Sustainability factor as a function of methane volume percent at different temperatures

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Fig. 5

Carbon deposition on catalyst as a function of methane volume percent at various temperatures

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Fig. 6

Total amount of carbon production per gram of catalyst as a function of methane volume percent at various temperatures

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Fig. 7

Carbon formation rate at different methane volume percent

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Fig. 8

Carbon formation rate at different temperatures

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Fig. 9

Carbon formation rate (rC) versus carbon deposition (Cdep/CCatalyst)

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Fig. 10

Initial reaction rate versus partial pressure of methane at various temperatures

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Fig. 11

Arrhenius plot of ln(kP) as a function of 1/T

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Fig. 12

Catalyst activity versus time for different methane volume percent

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Fig. 13

X-ray diffraction pattern of fresh Fluka 05105 and after decomposition at 800 °C, 850 °C, 900 °C, and 950 °C

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Fig. 14

SEM image of the deactivated catalyst after decomposition at 950 °C

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