Development of composite microwave catalysts (ABSx/CNTs, A = Co, B = Ni, Mo) for the highly effective direct decomposition of H2S into H2 and S

Abstract

The direct decomposition of hydrogen sulfide into hydrogen and sulfur has attracted plenty of attention due to its capability of recovering hydrogen and sulfur from a hazardous waste gas simultaneously. Nevertheless, it remains a tough challenge to achieve the direct decomposition of hydrogen sulfide at high conversion. In this work, we report the highly effective direct decomposition of hydrogen sulfide by microwave catalysis over the CoNi2S4/CNTs and CoMoS3.13/CNTs composite microwave catalysts. CoMoS3.13/CNTs exhibits excellent catalytic activity under microwave irradiation. The best H2S conversion of CoNi2S4/CNTs and CoMoS3.13/CNTs are respectively up to 58.15% and 71.77% at 750 °C under microwave irradiation, which far exceed the corresponding equilibrium conversion under conventional heating mode. Moreover, the apparent activation energies of CoNi2S4/CNTs and CoMoS3.13/CNTs are reduced to 17.88 and 15.83 kJ/mol, respectively, indicating an excellent microwave selective catalytic effect. Our finding is believed to provide a novel method to achieve direct H2S decomposition reaction.