Inhibiting fly ash reactivity by adding N- and S- containing compounds

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Title: Inhibiting fly ash reactivity by adding N- and S- containing compounds
Authors: Soler, Aurora | Conesa, Juan A. | Ortuño García, Nuria
Research Group/s: Residuos, Energía, Medio Ambiente y Nanotecnología (REMAN)
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Química
Keywords: Inhibition | Thiourea | Ammonium thiosulfate | Amidosulfonic acid | Model ash | Thermogravimetry
Knowledge Area: Ingeniería Química
Issue Date: Nov-2018
Publisher: Elsevier
Citation: Chemosphere. 2018, 211: 294-301. doi:10.1016/j.chemosphere.2018.07.177
Abstract: The inhibitory effect of thiourea (TUA), ammonium thiosulfate (TSA) and amidosulfonic acid (ASA) on the reactivity of fly ash air was investigated using a thermobalance at different heating rates (5, 10 and 20 K min−1). A model fly ash (activated carbon + 50 wt% CuCl2·2H2O, pyrolyzed at 700 °C and washed) was used as carbonaceous material. Adding CuCl2·2H2O to the activated carbon led to an increased rate of decomposition with the air's oxygen. TUA and TSA behaved in a similar way, accelerating the decomposition of the model fly ash. ASA also accelerated the decomposition but to a lower extent. We postulate that the increase in decomposition rate is caused by a reaction between carbonaceous material and N and S-containing compounds. The formation of nitrogenated and sulphured compounds was confirmed by TG-MS. A kinetic model based on a single reaction of order 0.6 showed very good correlations with all the heating rates tested in oxidant atmosphere.
Sponsor: This work was supported by the CTQ2016-76608-R project from the Ministry of Economy, Industry and Competitiveness (Spain), the PROMETEOII/2014/007 project of the Valencian Community Regional Government (Spain) and the UAUSTI17-07 grant from University of Alicante (Spain).
ISSN: 0045-6535 (Print) | 1879-1298 (Online)
DOI: 10.1016/j.chemosphere.2018.07.177
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2018 Elsevier Ltd.
Peer Review: si
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Appears in Collections:INV - REMAN - Artículos de Revistas

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