Simulation of SO2 absorption into sulfuric acid solutions containing hydrogen peroxide in the fast and moderately fast kinetic regimes

Colle, Sandrine; Vanderschuren, J.; Thomas, Diane

doi:10.1016/j.ces.2005.04.076

Cited by 37 publications

(23 citation statements)

References 10 publications

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“…28 While SO 2 concentration rose from 500 to 2000 ppm, NO x removal efficiency gradually declined. This happened because SO 2 molecules could compete for active sites (Fe, Cu, and oxygen vacancies) with H 2 O 2 and NO (eqs 11−13), 29,30 which resulted in the reduction of •OH concentration for NO x removal. Thus, the optimal concentration of SO 2 was 500 ppm for 1% Cu−1% Fe/TiO 2 .…”

Section: Resultsmentioning

confidence: 99%

Investigation on Simultaneous Removal of SO₂ and NO over a Cu–Fe/TiO₂ Catalyst Using Vaporized H₂O₂: An Analysis on SO₂ Effect

Jia

Xiong

et al. 2021

Ind. Eng. Chem. Res.

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1% Cu−1% Fe/TiO 2 was selected as the optimal catalyst for simultaneous removal of NO and SO 2 with vaporized H 2 O 2 . The effects of temperature, the molar ratio of H 2 O 2 and NO, gas hourly space velocity (GHSV), and SO 2 concentration on simultaneous removal efficiency were investigated. Besides, a 24 h stability test was conducted on the 1% Cu−1% Fe/TiO 2 and 2% Fe/ TiO 2 . The results showed that the excellent removal efficiency of 93.9% for NO x and 100% for SO 2 was obtained under the optimal conditions. Moreover, 1% Cu−1% Fe/TiO 2 presented excellent sulfurresistant stability. Furthermore, the fresh and spent catalysts were characterized by SO 2 -TPD, XRD, EPR, TEM, EDS, XPS, and FTIR. It was found that the generation of sulfate species on the catalysts would lead to the decrease of surface oxygen vacancies, resulting in the reduction of NO x removal. Additionally, the mechanism of Cu doping on catalytic performance was discussed. The introduction of Cu could improve the activity of the catalyst by the increase of surface oxygen vacancies and inhibit the formation of sulfates to improve the sulfur resistance of catalysts.

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Section: Resultsmentioning

confidence: 99%

Investigation on Simultaneous Removal of SO₂ and NO over a Cu–Fe/TiO₂ Catalyst Using Vaporized H₂O₂: An Analysis on SO₂ Effect

Jia

Xiong

et al. 2021

Ind. Eng. Chem. Res.

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“…The reasons could be explained as follows: SO 2 entered the liquid phase and was quickly dissolved into the water to form HSO 3 − and SO 3 2− (Colle et al, 2004(Colle et al, , 2005, both of which reacted with NO, NO 2 , NO 2 − and NO 3 − to promote the oxidation and absorption of NO (Takeuchi et al, 1977;Weisweiler and Blumhqfer, 1984). Moreover, HSO 3 − and SO 3 2− could also combine with NO to form (ONSO 3 ) 2− , which further improved the absorption of NO (Littlejohn, 1986).…”

Section: Effects Of the So 2 Concentrationmentioning

confidence: 99%

Simultaneous removal of NO, SO₂ and Hg⁰ with the WDRMRS

Deng

Xiao

et al. 2021

Environmental Technology

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Micro-nanobubbles can spontaneously generate hydroxyl free radicals (• OH). Urea is a cheap reductant and can react with NOx species, and their products are nontoxic and harmless N 2 , CO 2 and H 2 O. In this study, a Wet Direct Recycling Micro-nanobubble Flue Gas Multi-pollutants Removal System (WDRMRS) was developed for the simultaneous removal of NO, SO 2 and Hg 0 . In this system, a micro-nanobubble generator (MNBG) was used to produce a micro-nanobubble gas-liquid dispersion system (MNBGLS) through recycling the urea solution from the reactor and the simulated flue gas composed of N 2 , NO, SO 2 and Hg 0 . The MNBGLS, which has a large gas-liquid dispersion interface, was recycled continuously from the MNBG to the reactor, thus achieving cyclic absorption of various pollutants. All of the investigated parameters, including the initial pH and temperature of the absorbent as well as the concentrations of urea, NO and SO 2 had significant effects on the NO removal efficiency but did not significantly affect the SO 2 removal efficiency, whereas only the initial solution pH and NO concentration affected the Hg 0 removal efficiency. The analysis results of the reaction mechanism showed that • OH played a critical role in the removal of various pollutants. After the treatment by this system, the main removal products were HgO sediment, SO 4 2− and NH 4+ which could be easily recycled.

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“…Antes da injeção nos cultivos, foi realizada a dessulfurização do gás de combustão, de acordo com o método proposto por Colle et al (2005). A corrente gasosa foi injetada em uma coluna de H 2 O 2 (10% v/v), a fim de remover o SO 2 presente no gás de combustão.…”

Section: Condições De Cultivounclassified

CULTIVO DE Scenedesmus actus LEB 116 UTILIZANDO COMO FONTE DE CARBONO CO2 RESULTANTE DA QUEIMA DO CARVÃO MINERAL PARA GERAÇÃO TERMELÉTRICA

Duarte¹,

Morais²,

Radmann³

et al. 2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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RESUMO -A crescente preocupação com o aumento na concentração dos gases de efeito estufa na atmosfera vem impulsionando diversas pesquisas a fim de reduzir os níveis de emissão de CO 2 . O objetivo do trabalho foi utilizar CO 2 presente no gás de combustão, proveniente de termelétrica a carvão, como fonte de carbono no cultivo de Scenedesmus actus LEB 116. A fonte de carbono original do meio de cultivo foi substituída por CO 2 (aproximadamente 10% v/v) presente no gás de combustão. Parâmetros cinéticos dos cultivos foram avaliados, bem como a fixação diária máxima de CO 2 . As maiores concentração celular máxima (0,82±0,02 g. L -1 ), produtividade máxima (0,07±<0,01 g. L -1 . d -1 ), velocidade específica máxima de crescimento (0,14±<0,01 d -1 ) e o menor tempo de geração (4,80±0,03 d) foram obtidos no ensaio em que a fonte de carbono foi substituída pelo CO 2 presente no gás de combustão. A máxima fixação diária obtida foi 270,02±22,1 mg.L -1 .dia -1 , demonstrando a eficiência de Scenedesmus actus LEB 116 em utilizar a fonte de carbono resultante da queima do carvão para geração termelétrica.

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Simulation of SO2 absorption into sulfuric acid solutions containing hydrogen peroxide in the fast and moderately fast kinetic regimes

Cited by 37 publications

References 10 publications

Investigation on Simultaneous Removal of SO₂ and NO over a Cu–Fe/TiO₂ Catalyst Using Vaporized H₂O₂: An Analysis on SO₂ Effect

Investigation on Simultaneous Removal of SO₂ and NO over a Cu–Fe/TiO₂ Catalyst Using Vaporized H₂O₂: An Analysis on SO₂ Effect

Simultaneous removal of NO, SO₂ and Hg⁰ with the WDRMRS

CULTIVO DE Scenedesmus actus LEB 116 UTILIZANDO COMO FONTE DE CARBONO CO2 RESULTANTE DA QUEIMA DO CARVÃO MINERAL PARA GERAÇÃO TERMELÉTRICA

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Simulation of SO2 absorption into sulfuric acid solutions containing hydrogen peroxide in the fast and moderately fast kinetic regimes

Cited by 37 publications

References 10 publications

Investigation on Simultaneous Removal of SO2 and NO over a Cu–Fe/TiO2 Catalyst Using Vaporized H2O2: An Analysis on SO2 Effect

Investigation on Simultaneous Removal of SO2 and NO over a Cu–Fe/TiO2 Catalyst Using Vaporized H2O2: An Analysis on SO2 Effect

Simultaneous removal of NO, SO2 and Hg0 with the WDRMRS

CULTIVO DE Scenedesmus actus LEB 116 UTILIZANDO COMO FONTE DE CARBONO CO2 RESULTANTE DA QUEIMA DO CARVÃO MINERAL PARA GERAÇÃO TERMELÉTRICA

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Investigation on Simultaneous Removal of SO₂ and NO over a Cu–Fe/TiO₂ Catalyst Using Vaporized H₂O₂: An Analysis on SO₂ Effect

Investigation on Simultaneous Removal of SO₂ and NO over a Cu–Fe/TiO₂ Catalyst Using Vaporized H₂O₂: An Analysis on SO₂ Effect

Simultaneous removal of NO, SO₂ and Hg⁰ with the WDRMRS