In:
Journal of Chemical Technology & Biotechnology, Wiley, Vol. 91, No. 4 ( 2016-04), p. 1023-1030
Abstract:
SO 2 is an important gaseous pollutant that seriously affects the environment and human health. The most common method for SO 2 removal is absorption by NaOH solution and then forming HSO 3 − . Since generation of high‐value products and reduction of alkali consumption are important for the economy and practical application, selenium‐catalyzed HSO 3 − disproportionation was developed in this study. RESULTS Selenium decreased the reaction temperature of HSO 3 − disproportionation from 〉 433 K to 343 K. The effects of HSO 3 − concentration, temperature, selenium dosage, and stirring intensity were investigated. Selenium could be used at least five times with stable catalytic performance, indicating satisfactory reusability. More importantly, a catalytic mechanism was proposed using dynamic light scattering, differential scanning calorimetry and UV ‐visible transmittance spectrophotometry. Results showed that selenium‐catalyzed HSO 3 − disproportionation experienced a solid–liquid–solid phase transformation process. During this process, SeSO 3 2 − and HSe − were identified as the intermediates. Furthermore, products, i.e. sulfur and sodium bisulfate, were characterized to demonstrate their structure and composition. CONCLUSION Selenium was an efficient catalyst for HSO 3 − disproportionation. This catalytic process offered the advantages of less consumption of alkali and production of high‐valuable products, and thus was a potential alternative to other technology for SO 2 removal in practical applications. © 2015 Society of Chemical Industry
Type of Medium:
Online Resource
ISSN:
0268-2575
,
1097-4660
DOI:
10.1002/jctb.2016.91.issue-4
Language:
English
Publisher:
Wiley
Publication Date:
2016
detail.hit.zdb_id:
1479465-2
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