Highly efficient H-2 and S production from copious waste H2S is beneficial from both environmental and energy. Whereas, the highly effective direct decomposition of H2S reaction faces a gigantic obstacle, that is, there is the severe thermal equilibrium limitation. Herein, a family of TiO2 modified MoxC as novel microwave catalysts have been developed. This work demonstrates that Mo2C, Mo2C-TiO2 and MoC@TiO2 microwave catalysts display excellent catalytic performance to recover both valuable H-2 and elemental S from the direct decomposition of H2S under microwave irradiation. The optimal H2S conversion of MoC@TiO2 can be as high as 99.9% (almost complete conversion) at 700 degrees C, which greatly outpaces the corresponding H2S equilibrium conversion under microwave irradiation. This result of the chemical equilibrium limitation being broken shows an interesting phenomenon, namely a significant microwave selective catalytic effect by microwave catalysis in H2S decomposition reaction. In addition, the apparent activation energy of the Mo2C, Mo2C-TiO2 and MoC@TiO2 microwave catalysts reduced to 18.2 kJ/mol, 16.8 kJ/mol and 15.6 kJ/mol under microwave irradiation. The work supplies a strategy for highly effective valuable H-2 and S production from H2S decomposition reaction, and paves a path to high-value utilization of hazardous waste H2S resources with energy-saving heating method.
分享
载入中，请稍后...
