Abstract
ABSTRACTA new method of removing H2S using the solution of peroxo phosphomolybdic acid was developed. The results showed that the solution of peroxo phosphomolybdic acid had perfect capacity for H2S removal. A H2S removal efficiency of 100% for 10 h could be achieved by using two-stage absorption with an absorbent concentration of 0.02 mol L–1. The effect of temperature, concentration of peroxo phosphomolybdic acid and H2S on H2S removal was explored. According to the results, a high absorbent concentration, low H2S concentration and slightly excessive H2O2 are beneficial to H2S removal under relatively low temperature. The absorbent showed a perfect regeneration performance, and could be reactivated simply by adding a few drops of 30% H2O2 solution. The X-ray photoelectron spectra showed that the H2S was oxidized to SO42– finally.
Highlights
Due to its corrosivity, peculiar smell and toxicity for human and environment, the removal of hydrogen sulfide (H2S) has caused concerns of numerous researchers (Wang et al, 2008; Tian et al, 2009)
The H2S removal performance of Heteropoly acid (HPA) solution showed a significant increase after the addition of H2O2 due to the stronger oxidative ability of peroxo heteropoly acid (PHPA)
Peroxo phosphomolybdic acid solution was used for H2S removal for the first time
Summary
Peculiar smell and toxicity for human and environment, the removal of hydrogen sulfide (H2S) has caused concerns of numerous researchers (Wang et al, 2008; Tian et al, 2009). Acid (HPA) and heteropoly compound (HPC) have been applied for various catalytic fields based on their unique catalytic activity and redox property (Pope and Müller, 1991; Kozhevnikov, 1995; Ding and Wang, 2016). With deeper research on HPA, it was found that the oxygen of MO6 could be replaced by O22– and generated the peroxo heteropoly acid (PHPA) (Ishii et al, 1988). The HPA reacts with hydrogen peroxide at the ratio of 1:24, producing the corresponding peroxo species (Yadav and Mistry, 2001). The system of HPA/H2O2 has been widely employed in the field of deep-desulfurization
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