The multiple reactor system provides an integrated system for running multiple reactions simultaneously and applying the principles of high throughput experimentation to reactions conducted at elevated temperatures and pressures. It involves six reactors (Vtot = 75 mL, Vmax = 40 mL) with internal stirring (single magnetic stirrer system 0–1200 rpm). Operating pressures to 200 bar and operating temperatures to 300 °C (heating rates up to 15 °C per minute). It allows for two different input gases (nitrogen, oxygen, air) and individual temperature and pressure control. Both the vessel with its wetted parts and the valve and head fittings exposed to vapors are constructed from Hastelloy.