In:
RSC Advances, Royal Society of Chemistry (RSC), Vol. 13, No. 2 ( 2023), p. 1312-1319
Abstract:
The development of sorbents for flue gas desulfurization in a dry mode is essential to control emission of sulfur dioxide. Based on the novel concept of “treating waste with waste”, a low-cost and highly activated calcium-based sorbent (ACS) was prepared using coal fly ash, CaO and waste gypsum as the raw materials via the one-step incipient wetness impregnation method. Based on characterization using scanning electron microscopy and nitrogen adsorption–desorption, the ACS possessed a fibrous and netted structure with high porosity, which improved SO 2 adsorption greatly. The SO 2 adsorption capacity of ACS with coal fly ash/CaO/CaSO 4 = 1/2/1 was high, up to 44.26 mg g −1 , with 100% removal efficiency at 150 °C. In the absence of O 2 , SO 2 was rapidly adsorbed on the sorbent to form CaSO 3 according to in situ DRIFTS analysis, while when O 2 was present in the flue gas, SO 2 /SO 3 2− tended to be oxidized into SO 4 2− species. Moreover, the presence of NO can further enhance the SO 2 adsorption capacity of the ACS due to the formation of adsorbed NO 2 or nitrate species with strong oxidizing properties. Therefore, the ACS can be considered as a sustainable sorbent with the advantage of employing fly ash for the removal of sulfur dioxide.
Type of Medium:
Online Resource
ISSN:
2046-2069
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2623224-8
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