Evaluation on hydrothermal gasification of styrene-butadiene rubber with oxidants via ReaxFF-MD simulation

•Hydrothermal gasification of styrene-butadiene rubber was examined by ReaxFF-MD.•The optimal equivalent ratio of oxidant for H2 yield was 0.4 between 350 and 600 °C.•H-abstraction reaction that OH radicals capture H atom was critical to degrade SBR.•The simulated critical temperature was determined to be 2050 K by RDF analysis.•H2O2 is easily converted to OH radicals compared with O2 and pure water.