Oxidation of NO by ozone in the presence of TiO 2 catalyst

Jõgi, Indrek; Erme, Kalev; Raud, Jüri; Laan, M.

doi:10.1016/j.fuel.2016.01.039

Cited by 61 publications

(43 citation statements)

References 37 publications

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“…The catalyst increased the reaction rate k by 10-50%, but the differences remained within the uncertainty of the measurements. Our earlier measurements have demonstrated 2-3 times higher removal efficiency in the presence of TiO 2 catalyst [20,59] but these results were obtained in the dry mixtures and at considerably higher NO x concentrations. It is possible that water vapor, CO 2 , CO or trace amounts of unburned hydrocarbons (only at ER = 0.8) block some of the active sites on the surface and decrease the efficiency of catalyst.…”

Section: Ozone Treatment With Tio 2 Catalystmentioning

confidence: 75%

“…The possibility to improve the oxidation of NO 2 to N 2 O 5 was further investigated by including TiO 2 catalyst in the reaction zone containing ozone. The reaction chamber was heated to 100 • C because earlier experiments have shown that the catalyst is most efficient at these conditions [59]. Besides, the ozone oxidation also improves at higher temperatures [59] and the results obtained in the presence of catalyst were compared to those obtained in the absence of the catalyst in the same conditions.…”

Section: Ozone Treatment With Tio 2 Catalystmentioning

confidence: 99%

“…The reaction chamber was heated to 100 • C because earlier experiments have shown that the catalyst is most efficient at these conditions [59]. Besides, the ozone oxidation also improves at higher temperatures [59] and the results obtained in the presence of catalyst were compared to those obtained in the absence of the catalyst in the same conditions. It should be noted that the catalyst alone had no detectable effect on the NO concentration.…”

Section: Ozone Treatment With Tio 2 Catalystmentioning

confidence: 99%

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Application of Non-Thermal Plasma for NOx Reduction in the Flue Gases

et al. 2019

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Over the years, ever more stringent requirements on the pollutant emissions, especially NO X , from combustion systems burning natural gas are introduced by the European Union (EU). Among all NO X reduction methods, the flue gas treatment by plasma is widely applied and could be used for both small scale and domestic combustion systems. However, the removal efficiency depends on concentrations of oxygen, water vapor, traces of hydrocarbons, and nitrogen oxides in flue gas. In order to analyze the application of the NO X reduction for small-scale or domestic combustion systems, experiments of NO X reduction by non-thermal plasma from real flue gases originating from premixed methane combustion at different equivalence ratio (ER) values were performed. It was determined that the residual oxygen in flue gas plays an important role for improvement of NO to NO 2 oxidation efficiency when O 2 concentrations are equal to or higher than 6%. The power consumption for the plasma oxidation constituted approximately 1% of the burner power. In the case of ozone treatment, the addition of O 3 to flue gas showed even more promising results as NO formed during combustion was fully oxidized to NO 2 at all ER values.

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Section: Ozone Treatment With Tio 2 Catalystmentioning

confidence: 75%

Section: Ozone Treatment With Tio 2 Catalystmentioning

confidence: 99%

Section: Ozone Treatment With Tio 2 Catalystmentioning

confidence: 99%

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Application of Non-Thermal Plasma for NOx Reduction in the Flue Gases

et al. 2019

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“…Metal oxide is a kind of catalyst that has been studied earlier in the field of NO catalytic oxidation and developed vigorously. Jogi et al [105] found that the presence of TiO 2 greatly enhanced the efficiency of O 3 oxidation of NO 2 to N 2 O 5 at 100 • C. Wang et al [106] synthesized manganese oxides with different valences (MnO 2 , Mn 2 O 3 , and Mn 3 O 4 ) by hydrothermal method. At the space velocity of 48,000 mLg −1 h −1 , with oxygen as oxidant, the maximum NO conversion rate was 91.4%.…”

Section: Catalytic Oxidation Of Metal Oxidesmentioning

confidence: 99%

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

Liu

et al. 2019

Catalysts

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Nitrogen oxides (NO x ) represent one of the main sources of haze and pollution of the atmosphere as well as the causes of photochemical smog and acid rain. Furthermore, it poses a serious threat to human health. With the increasing emission of NO x , it is urgent to control NO x . According to the different mechanisms of NO x removal methods, this paper elaborated on the adsorption method represented by activated carbon adsorption, analyzed the oxidation method represented by Fenton oxidation, discussed the reduction method represented by selective catalytic reduction, and summarized the plasma method represented by plasma-modified catalyst to remove NO x . At the same time, the current research status and existing problems of different NO x removal technologies were revealed and the future development prospects were forecasted.Catalysts 2019, 9, 771 2 of 39 adsorption, oxidation, reduction, and plasma methods. In view of these attentive findings, adsorption method uses recyclable solid adsorbent material to adsorb NO x from flue gas through microporous structure, remarkably, environmentally friendly, no secondary pollution, and energy-saving and -efficient features make it stand out [18][19][20]. The oxidation process is a method that oxidizes NO into NO 2 or N 2 O 3 with high solubility under the action of an oxidant that is then absorbed by water or alkali solution. The process is simple and cost-saving, and is widely used in the wet flue gas denitrification process with relatively low cost and high removal efficiency of NO x ; except that the oxidized NO and SO 2 can be removed simultaneously to produce high value-added products [21][22][23]. The reduction method has the characteristics of high efficiency, cleanliness, and mildness; NO x removal can be realized at low temperature at present [24][25][26]. The plasma method is used to modify the surface of the catalyst, the dispersion of active species can be improved by plasma treatment, and the stability and low temperature activity of catalyst can be improved [27,28].Seldom, if ever, does a comprehensive article to introduce the current situation and treatment methods of removing NO x . In this paper, we tried to renovate, classify, and summarize the significant perspectives and most relevant findings reported in recent research articles and earlier reviews generalizing the mechanism analysis and research progress of NO x removal by adsorption, oxidation, reduction, and plasma methods, which can provide means for promoting the technological progress of pollution prevention, maintaining healthy development of factories continuously, studying the methods of removing NO x deeply, and mastering different technologies of removing NO x , as well as providing guidance for controlling the emission of NO x from motor vehicles such as diesel, gasoline, and so on. In order to improve the environmental quality and save the ecological environment, this paper further provides a convenient, low-cost, efficient, and economic guidance line.

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“…The ozone injection reactor (with TiO2 as the catalyst) was further studied at different catalyst temperatures, flow rates and inlet NO concentrations [42]. NO to NO2 oxidation was correlated with the inlet O3 concentration.…”

Section: No Oxidation Using Ntp-catalyst Systemmentioning

confidence: 99%

Non-thermal-plasma-activated de-NO _x catalysis

Gholami

Stere

Goguet

et al. 2017

Phil. Trans. R. Soc. A.

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The combination of non-thermal plasma (NTP) with catalyst systems as an alternative technology to remove NO x emissions in the exhaust of lean-burn stationary and mobile sources is reviewed. Several factors, such as low exhaust gas temperatures (below 300°C), low selectivity to N 2 and the presence of impurities, make current thermally activated technologies inefficient. Various hybrid plasma–catalyst systems have been examined and shown to have a synergistic effect on de-NO x efficiency when compared with NTP or catalyst-alone systems. The NTP is believed to form oxygenated species, such as aldehydes and nitrogen-containing organic species, and to convert NO to NO 2 , which improves the reduction efficiency of N 2 during hydrocarbon-selective catalytic reduction reactions. The NTP has been used as a pretreatment to convert NO to its higher oxidation states such as NO 2 to improve NO x reduction efficiency in the subsequent processes, e.g. NH 3 -selective catalytic reduction. It has been applied to the lean phase of the NO x storage to improve the adsorption capacity of the catalyst by conversion of NO to NO 2 . Alternatively, a catalyst with high adsorption capacity is chosen and the NTP is applied to the rich phase to improve the reduction activity of the catalyst at low temperature. This article is part of a discussion meeting issue ‘Providing sustainable catalytic solutions for a rapidly changing world’.

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Oxidation of NO by ozone in the presence of TiO 2 catalyst

Cited by 61 publications

References 37 publications

Application of Non-Thermal Plasma for NOx Reduction in the Flue Gases

Application of Non-Thermal Plasma for NOx Reduction in the Flue Gases

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

Non-thermal-plasma-activated de-NO _x catalysis

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Oxidation of NO by ozone in the presence of TiO 2 catalyst

Cited by 61 publications

References 37 publications

Application of Non-Thermal Plasma for NOx Reduction in the Flue Gases

Application of Non-Thermal Plasma for NOx Reduction in the Flue Gases

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

Non-thermal-plasma-activated de-NO x catalysis

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Product

Resources

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Non-thermal-plasma-activated de-NO _x catalysis