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Research Papers

Kinetic Analysis of C4 Alkane and Alkene Pyrolysis: Implications for SOFC Operation

[+] Author and Article Information
Ahmed Al Shoaibi

Department of Chemical Engineering, Petroleum Institute, Abu Dhabi, UAEaalshoaibi@pi.ac.ae

Anthony M. Dean

Department of Chemical Engineering, Colorado School of Mines, Golden, CO 80401amdean@mines.edu

J. Fuel Cell Sci. Technol 7(4), 041015 (Apr 09, 2010) (8 pages) doi:10.1115/1.4000677 History: Received March 14, 2009; Revised August 02, 2009; Published April 09, 2010; Online April 09, 2010

Pyrolysis experiments of isobutane, isobutylene, and 1-butene were performed over a temperature range of 550750°C and a pressure of 0.8atm. The residence time was 5s. The fuel conversion and product selectivity were analyzed at these temperatures. The pyrolysis experiments were performed to simulate the gas-phase chemistry that occurs in the anode channel of a solid-oxide fuel cell (SOFC). The experimental results confirm that molecular structure has a substantial impact on pyrolysis kinetics. The experimental data show considerable amounts of C5 and higher species (2.8mole% with isobutane at 750°C, 7.5mole% with isobutylene at 737.5°C, and 7.4mole% with 1-butene at 700°C). The C5+ species are likely deposit precursors. The results confirm that hydrocarbon gas-phase kinetics have substantial impact on a SOFC operation.

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Figures

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Figure 1

Experimental setup

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Figure 2

Experimental temperature profiles along the length of the quartz reactor

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Figure 3

Measured major light products for isobutane pyrolysis as a function of temperature

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Figure 4

Measured C5, C6, and C7 species for isobutane pyrolysis as a function of temperature

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Figure 5

Measured major light products for isobutylene pyrolysis as a function of temperature

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Figure 6

Measured C5, C6, C7, C8, C9, and C10 species for isobutylene pyrolysis as a function of temperature

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Figure 7

Measured major light products for 1-butene pyrolysis as a function of temperature

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Figure 8

Measured C5, C6, C7, C8, C9, C10, and C11 species for isobutylene pyrolysis as a function of temperature

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Figure 9

Observed C4 fuels reactivity as a function of temperature

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Figure 10

Total MWG products measured for isobutane, isobutylene, and 1-butene as a function of temperature

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Figure 11

Measured hydrogen mole % for C4 fuels as a function of temperature

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Figure 12

Measured methane mole % for C4 fuels as a function of temperature

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Figure 13

Measured ethylene mole % for C4 fuels as a function of temperature

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