Abstract:
Objective The decomposition of hydrogen sulfide to produce hydrogen can avoid waste gas pollution and utilize the resource to a greater degree. The preparation of high-efficiency and stable H2S decomposition catalysts at medium and low temperature and the exploration of their catalytic kinetic behavior are helpful to construct a new process for the efficient decomposition of H2S promoted by the sulfur chemical chain.
Methods The catalyst Cr2S3 was prepared using the solution combustion method. The composition and structure of the catalyst were characterized by XRD, BET and SEM/EDS. Additionally, its catalytic performance, stability and reaction kinetics in the catalytic decomposition of H2S for hydrogen production were investigated. This paper also studies the effect of fuel ratio on the catalyst's hydrogen production performance.
Results Under the reaction conditions of φ(H2S) = 5% and GHSV = 24 000 h−1, Cr2S3-T1.50 has the highest H2S conversion rate, up to 16.01% at 800 ℃, and no other side reactions appear. The kinetic analysis of the reaction shows that the apparent activation energy of H2S decomposition catalyzed by Cr2S3-T1.50 is 50.7 kJ/mol.
Conclusion The Cr2S3 catalyst prepared with the solution combustion method has excellent hydrogen production activity and stability at 400-800 ℃ and can significantly reduce the apparent activation energy of hydrogen sulfide decomposition.
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