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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

## Abstract

Pyrolysis experiments of isobutane, isobutylene, and 1-butene were performed over a temperature range of $550–750°C$ and a pressure of $∼0.8 atm$. The residence time was $∼5 s$. 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 ($∼2.8 mole %$ with isobutane at $750°C$, $∼7.5 mole %$ with isobutylene at $737.5°C$, and $∼7.4 mole %$ 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

Figure 1

Experimental setup

Figure 2

Experimental temperature profiles along the length of the quartz reactor

Figure 3

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

Figure 4

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

Figure 5

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

Figure 6

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

Figure 7

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

Figure 8

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

Figure 9

Observed C4 fuels reactivity as a function of temperature

Figure 10

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

Figure 11

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

Figure 12

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

Figure 13

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

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