Enhanced Oxygen Vacancies in a Two-Dimensional MnAl-Layered Double Oxide Prepared via Flash Nanoprecipitation Offers High Selective Catalytic Reduction of NOx with NH3

Zhao, Dan; Wang, Chao; Ye, Feng; Shi, Yulin; Cao, Ping; Dan, Jianming; Chen, Kai; Lv, Yin; Guo, Xuhong; Dai, Bin

doi:10.3390/nano8080620

Cited by 21 publications

(10 citation statements)

References 46 publications

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“…For MnAl-LDO samples, the diffraction pattern showed peaks at 18.1°, 28.9°, 30.7°, 32.5°, and 36.1°, corresponding to Mn 3 O 4 . 27 Meanwhile, the characteristic peaks assigned to CuO, NiO and Co 3 O 4 were clearly observed in the respective CuMnAl-LDO, NiMnAl-LDO and CoMnAl-LDO catalysts. 21,28,29 In addition, except for the MnAl-LDO, there is no noticeable diffraction peak for MnO x observed in the XRD patterns of the Cu-, Co- and Ni-doped catalysts, indicating the good dispersion of MnO x on the catalyst surface.…”

Section: Resultsmentioning

confidence: 91%

Enhancement of NH₃-SCR performance of LDH-based MMnAl (M = Cu, Ni, Co) oxide catalyst: influence of dopant M

Liu

Feng

et al. 2019

RSC Adv.

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Transition metal (Cu, Ni, Co) doped MnAl mixed oxide catalysts were prepared through a novel method involving the calcination of hydrotalcite precursors for the selective catalytic reduction of NO x with NH 3 (NH 3 -SCR). The effects of transition metal modification were confirmed by means of XRD, BET, TEM, XPS, NH 3 -TPD, and H 2 -TPR measurements. Experimental results evidenced that CoMnAl-LDO presented the highest NO x removal efficiency of over 80% and a relatively high N 2 selectivity of over 88% in a broad working temperature range (150-300 C) among all the samples studied. Moreover, the CoMnAl-LDO sample possessed better stability and excellent resistance to H 2 O and SO 2 . The reasons for such results could be associated with the good dispersion of Co 3 O 4 and MnO x , which could consequently provide optimum redox behavior, plentiful acid sites, and strong NO x adsorption ability.Furthermore, dynamics calculations verified the meaningful reduction in apparent activation energy (E a ) for the CoMnAl-LDO sample, which is in agreement with the DeNO x activity. Fig. 15 The results of SO 2 /H 2 O durability over MnAl-LDO, CuMnAl-LDO, NiMnAl-LDO and CoMnAl-LDO.This journal is

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Section: Resultsmentioning

confidence: 91%

Enhancement of NH₃-SCR performance of LDH-based MMnAl (M = Cu, Ni, Co) oxide catalyst: influence of dopant M

Liu

Feng

et al. 2019

RSC Adv.

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“…Zhang et al [177] studied the effect of Ce-Mo modified TiO 2 adsorbent on NO adsorption. Zhao et al [178] prepared two-dimensional layered MnAl double oxides by instantaneous nanoprecipitation. Wang et al [179] prepared MnO x -CeO 2 -Al 2 O 3 catalysts with different MnO x content by self-propagating high-temperature synthesis firstly, and the effects of different synthesis methods on NO conversion were compared in Table 4.…”

Section: Nh 3 -Scrmentioning

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 discussion continues with the contribution of Zhao et al [11], which is concerned with the development of LDH-based catalytic systems for the reduction of nitrogen oxides. Given the fact that these gases are largely emitted from the industrial combustion of fossils, their capture or catalytic conversion to non-harmful substances is crucial to prevent large-scale environmental pollution.…”

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confidence: 98%

“…Such an increased research activity led to progressively growing number of publications in the recent past, seven of which appear in this Special Issue. They include five original research papers [9,10,11,12,13] and two review articles [14,15] from world-class research groups. The topics of these papers are in line with the original goal of the Special Issue, as they range from the synthesis of novel LDHs and LDH-based composites, through their physico-chemical characterization, to applications as fertilizers, drug delivery vehicles, and catalysts.…”

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confidence: 99%

Layered Double Hydroxide-Based Nanomaterials-From Fundamentals to Applications

Szilágyi

2019

Nanomaterials

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Enhanced Oxygen Vacancies in a Two-Dimensional MnAl-Layered Double Oxide Prepared via Flash Nanoprecipitation Offers High Selective Catalytic Reduction of NOx with NH3

Cited by 21 publications

References 46 publications

Enhancement of NH₃-SCR performance of LDH-based MMnAl (M = Cu, Ni, Co) oxide catalyst: influence of dopant M

Enhancement of NH₃-SCR performance of LDH-based MMnAl (M = Cu, Ni, Co) oxide catalyst: influence of dopant M

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

Layered Double Hydroxide-Based Nanomaterials-From Fundamentals to Applications

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Enhanced Oxygen Vacancies in a Two-Dimensional MnAl-Layered Double Oxide Prepared via Flash Nanoprecipitation Offers High Selective Catalytic Reduction of NOx with NH3

Cited by 21 publications

References 46 publications

Enhancement of NH3-SCR performance of LDH-based MMnAl (M = Cu, Ni, Co) oxide catalyst: influence of dopant M

Enhancement of NH3-SCR performance of LDH-based MMnAl (M = Cu, Ni, Co) oxide catalyst: influence of dopant M

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

Layered Double Hydroxide-Based Nanomaterials-From Fundamentals to Applications

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Enhancement of NH₃-SCR performance of LDH-based MMnAl (M = Cu, Ni, Co) oxide catalyst: influence of dopant M

Enhancement of NH₃-SCR performance of LDH-based MMnAl (M = Cu, Ni, Co) oxide catalyst: influence of dopant M