Hydrogen peroxide was directly produced from hydrogen and oxygen in a slurry reactor containing a Pd/C catalyst at 5–20°C. Hydrogen and oxygen produced by a solid polymer electrolyte water electrolyzer were fed into the reactor. The effects of reaction temperature, slurry concentration, gas flow rate and solvent on the H
2O
2 production were investigated. The maximum production rate of H
2O
2 was obtained at a reaction temperature of 10°C and sharply increased along with the addition of methanol. The results show that H
2O
2 production is significantly influenced by the solubility of the gas, while excessive catalyst and hydrogen facilitate the decomposition of the accumulated H
2O
2. Finally, H
2O
2 production was performed in a catalytic slurry reactor with a pair of platinum electrodes inserted. The
in situ feed of hydrogen and oxygen into the reactor improved H
2O
2 production. This could be due to an increase in gas solubility due to fine bubbles or the electrochemical generation of H
2O
2.
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