Pyrolysis experiments of isobutane, isobutylene, and 1-butene were performed over a temperature range of and a pressure of . The residence time was . 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 and higher species ( with isobutane at , with isobutylene at , and with 1-butene at ). The species are likely deposit precursors. The results confirm that hydrocarbon gas-phase kinetics have substantial impact on a SOFC operation.