Rapid and efficient removal of CO in CH4 and CH4/coal dust hybrid explosions: A novel approach of spraying catalyst powder

Li, Jia; Guo, Zengzeng; Chen, Xiaoyu; Zhou, Fang

doi:10.1016/j.fuel.2020.119790

Cited by 10 publications

(4 citation statements)

References 54 publications

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“…The faster the reduction in the CO concentration to a safe value, the safer the underground personnel. Fig 4 shows that the effect of the removing agent quantity varies in the reaction catalysis period: the higher the quantity, the better the removing effect, consistent with a previous result [ 33 ]. When 5% CO was treated with 10 g of the rapid removing agent, the CO concentration reduced to 0.51% (5100 ppm), the reaction rate rapidly reduced, and the reaction time significantly increased.…”

Section: Resultssupporting

confidence: 88%

“…This is because, the greater the mass of the removing agent, the shorter the catalytic activation period, and the earlier it enters the catalytic reaction period, the shorter the time required to reach the maximum removing rate. Since the removing agent -catalyzed oxidation of CO conforms to the Mars–van Krevelen mechanism [ 33 – 36 ], the greater the mass of the removing agent, the higher the lattice oxygen content on its surface, thus reducing the catalytic activation period.…”

Section: Resultsmentioning

confidence: 99%

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Experimental research on rapid removing characteristics of carbon monoxide generated during gas explosions

Sun

Zhou

et al. 2022

PLoS ONE

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A large amount of gas, such as CO, accumulates in a coal mine after an explosion, leading to CO poisoning. In this study, a self-developed platform was used to eliminate CO from coal mines and determine the mass of the rapidly eliminated CO and its concentration in the eliminated gases. Equations were derived to calculate the amount of CO eliminated and the removing rate. The results showed that a rapid removing reagent in the form of nonprecious metal catalysts is useful for removing CO. Removing agents with larger masses facilitated the activation, irrespective of the CO concentration. For removing reagent amounts of 10, 15, 20, 25, and 30 g, the amount of CO eliminated, the removing rate, and the time required to complete catalytic oxidation increased sequentially. The CO removing process could be divided into three stages (I, II, and III) based on the variations in the CO, CO2, and O2 concentrations during CO removing. The removing reagent first chemically adsorbs CO and O2, and then desorbs CO2. The final CO concentration tends to 0, the O2 concentration remains stable, and the CO2 concentration decreases. This shows that the ablation agent has an impact on the changes in the CO and CO2 concentrations.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Experimental research on rapid removing characteristics of carbon monoxide generated during gas explosions

Sun

Zhou

et al. 2022

PLoS ONE

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“…Cai et al synthesized Cu–Mn oxide with different precursors and sediments using a co-precipitation method as the CO eliminator. Li et al , prepared Cu–Mn catalyst samples using a hydrothermal method as the CO eliminatorn. Therefore, when only Cu and Mn elements are contained in the eliminator, the ratio of Cu to Mn mass fraction is controlled at 1:2 in the preparation of the eliminator, and the CO elimination performance is higher.…”

Section: Experimental Sectionmentioning

confidence: 99%

“…This phenomenon remarkably reduces the air quality in the coal mine. Accumulation of coal mine gas and coal dust explosion, , coal fire, , and blasting operations in mines , unavoidably produce huge amounts of carbon monoxide (CO) in the mine atmosphere. When a large amount of CO gas is inhaled by a person, it easily combines with hemoglobin in the blood, which results in hypoxia, suffocation, and even death. , Accordingly, it is essential to remove CO from the coal mine atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sn on the CO Catalytic Activity and Water Resistance of Cu–Mn Catalyst

et al. 2022

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In view of the problem that excessive CO in underground coal mine space can easily lead to a large number of casualties, Cu–Mn–Sn water-resistant eliminators with different Sn contents were prepared by a co-precipitation method. The activity of the eliminators was analyzed by using an independently developed activity testing platform, N 2 adsorption and desorption, XRD, SEM, XPS, and FTIR to characterize the activity factors and water resistance. The results showed that Cu–Mn–Sn-20 with 20% Sn content had the highest activity, which was 3.23 times that of Cu–Mn. The main reason for the increased activity is that Cu–Mn–Sn-20 doped with 20% Sn provides a larger specific surface area and more active sites and reduces the pore size, so that the crystallization degree of Cu 1.4 Mn 1.5 O 4 is lower. The doping of 20% Sn reduces the absorption of lattice water and coordination water and improves the water resistance of Cu–Mn–Sn-type eliminators. The Cu–Mn–Sn-20 water-resistant eliminator is used to quickly eliminate CO in underground coal mines, which is of great significance for the rescue workers in underground coal mines after disasters.

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Methods to predict variations of lower explosion limit associated with hybrid mixtures of flammable gas and dust

Yang

et al. 2022

Fuel

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Rapid and efficient removal of CO in CH4 and CH4/coal dust hybrid explosions: A novel approach of spraying catalyst powder

Cited by 10 publications

References 54 publications

Experimental research on rapid removing characteristics of carbon monoxide generated during gas explosions

Experimental research on rapid removing characteristics of carbon monoxide generated during gas explosions

Effect of Sn on the CO Catalytic Activity and Water Resistance of Cu–Mn Catalyst

Methods to predict variations of lower explosion limit associated with hybrid mixtures of flammable gas and dust

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