LAUSR

Abstract Direct decomposition of H 2 S into H 2 and S has attracted increasing attention because it can simultaneously recover H 2 and S from a hazardous waste gas. However, direct decomposition of H 2 S with high H 2 S conversion is still a great challenge. Herein, we report highly effective direct decomposition of H 2 S into H 2 and S by microwave catalysis over CoS-MoS 2 /γ-Al 2 O 3 microwave catalysts. The CoS-MoS 2 /γ-Al 2 O 3 exhibits outstanding catalytic activity under microwave irradiation. The best H 2 S conversion is respectively up to 66.9% for CoS-MoS 2 /γ-Al 2 O 3 and 36.2% for the MoS 2 /γ-Al 2 O 3 catalyst at 750 °C under microwave irradiation, which greatly exceeds the corresponding H 2 S equilibrium conversion under the conventional thermal conditions. Importantly, the apparent activation energy for MoS 2 /γ-Al 2 O 3 and CoS-MoS 2 /γ-Al 2 O 3 microwave catalysts under microwave irradiation respectively decrease to as low as 20.74 and 17.46 kJ/mol, which displays an outstanding microwave direct catalytic effect. Our findings open a novel approach for the direct H 2 S decomposition reaction.