Enhanced selective catalytic reduction of NO over Mn-Ce catalysts with the acetic-acid-chelated titania support at low temperature

Liu, Bo‐Tau; Huang, Chung-Jie; Ke, Yuxuan; Wang, Weihong; Kuo, Han-Lin; Lin, Darren; Lin, Vincent; Lin, Sze‐Kwan

doi:10.1016/j.apcata.2017.03.029

Cited by 20 publications

(4 citation statements)

References 38 publications

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“…42 In addition, the Cu 2+ content on the ZnCl 2 -Cu/AC catalyst exhibits the lowest Cu 2+ content and the highest toxicity. 43 According to previous studies, SO 4 2À ions can promote the continuous replenishment of O b , 31 which is in agreement with the lower toxicity of the ZnSO 4 -doped catalyst compared with the ZnCl 2 -Cu/AC catalyst. Fig.…”

Section: Valence State Of the Elementsupporting

confidence: 69%

“…Conventional SCR uses NH 3 as the reducing agent, which has good reducibility and catalysts with high denitration efficiency. 4,5 However, NH 3 is a costly and toxic gas whose leakage may cause serious problems, including chemical accidents, catalyst poisoning, and pipeline corrosion. 6 To circumvent these issues, the development of new reducing agents has attracted increasing attention.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism of Zn salt-induced deactivation of a Cu/activated carbon catalyst for low-temperature denitration via CO-SCR

et al. 2022

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Section: Valence State Of the Elementsupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Mechanism of Zn salt-induced deactivation of a Cu/activated carbon catalyst for low-temperature denitration via CO-SCR

et al. 2022

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“…Until now, selective catalytic reduction (SCR) has been considered to be the most effective process used to remove NO. For Hg 0 removal, activated carbon injection (ACI) systems are the most effective available technologies (Sjostrom et al 2010;Liu et al 2017). However, the large activated carbon consumption of ACI and the high investment and operating costs involved in controlling the two emissions separately have led researchers to develop a new technology to purify NO and Hg 0 simultaneously (Fang et al 2013;Zhang et al 2017a).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous oxidation of Hg0 and NH3-SCR of NO by nanophase Ce x Zr y Mn z O2 at low temperature: the interaction and mechanism

Zeng

et al. 2018

Environ Sci Pollut Res

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Simultaneous oxidation of Hg and NH-SCR of NO by catalyst is one of the key methods for co-purification of coal-fired flue gas. Till now, the interaction between the oxidation of Hg and NH-SCR of NO and its mechanism have not clarified. In this study, a series of nanophase Ce Zr Mn O was prepared for the simultaneous oxidation of Hg and NH-SCR of NO at low temperature. The catalysts were characterized using surface area analysis, X-ray diffraction, temperature-programmed techniques, and several types of microscopy and spectroscopy. The experimental results indicated that the CeZrMnO exhibited superior Hg removal efficiency (> 99%) and NO conversion efficiency (> 90%) even at 150 °C, and it also exhibited a good durability in the presence of SO and HO. The excellent performance of CeZrMnO on co-purifying Hg and NO was due to the stronger synergistic effects of Ce-Zr-Mn in CeZrMnO than that of the others, which was illustrated by the characterization results of XPS, XRD, and FT-IR. Moreover, it was found that the NO conversion of CeZrMnO could be slightly influenced by Hg and was decreased about 4% to the max, while that of Hg could rarely be affected by the selected catalytic reduction process of NO. It might be due to the co-purification mechanism of NO and Hg. The mechanism of the simultaneous oxidation of Hg and NH-SCR of NO was mainly due to the synergetic effect on the mobility of surface oxygen and the activation of lattice oxygen of CeZrMnO. The effect of the oxidation of Hg on the NH-SCR of NO was mainly due to the absorbed Hg/Hg on the surface of CeZrMnO, which attenuated the formation of NH, -NH, and NH on its acid sites. Similarly, the NH-SCR of NO process could hardly influence the oxidation of Hg when NO and Hg were co-purified.

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“…There might be no crystalline metal oxides, or MnOx and CeOx highly disperses on the supports [17], leading to low crystallinity and amorphous non-crystalline structure. Liu et al [18] reported manganese oxide phase state could affect denitration activity and increase the dispersion, promoting the generation of amorphous manganese oxide and significantly improving denitration rate. As shown in Figure 3, the relative intensity of SiO 2 diffraction peak of the catalyst doped with TiO 2 was lower than that of the catalyst based on FA alone.…”

Section: Xrd Analysismentioning

confidence: 99%

Low Temperature Selective Catalytic Reduction Using Molding Catalysts Mn-Ce/FA and Mn-Ce/FA-30%TiO2

Gou

Wang

et al. 2017

Energies

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Mn-Ce/FA (M) and Mn-Ce/FA-TiO 2 (M), using fly ash (FA) with and without TiO 2 as the carriers, were prepared by an integral molding technique. With the increase of TiO 2 content, the rates of NO conversion and denitration of Mn-Ce/FA-TiO 2 (M) increased, and the NO 2 and N 2 O formation rates decreased. It is found that TiO 2 could effectively inhibit the excessive oxidation of NO and the generation of N 2 O. The effects of space velocity, oxygen concentration and ammonia nitrogen ratio on three types of nitrogen oxides (NO, NO 2 , N 2 O) and denitration rates of the Mn-Ce/FA (M) and Mn-Ce/FA-30%TiO 2 (M) were further investigated. In addition, it is demonstrated that Mn-Ce/FA (M) and Mn-Ce/FA-30%TiO 2 (M) were more suitable to be used in the environment of low sulfur and less water. • Mn-Ce/FA-30%TiO 2 (M) showed higher NO conversion than Mn-Ce/FA(M).

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Enhanced selective catalytic reduction of NO over Mn-Ce catalysts with the acetic-acid-chelated titania support at low temperature

Cited by 20 publications

References 38 publications

Mechanism of Zn salt-induced deactivation of a Cu/activated carbon catalyst for low-temperature denitration via CO-SCR

Mechanism of Zn salt-induced deactivation of a Cu/activated carbon catalyst for low-temperature denitration via CO-SCR

Simultaneous oxidation of Hg0 and NH3-SCR of NO by nanophase Ce x Zr y Mn z O2 at low temperature: the interaction and mechanism

Low Temperature Selective Catalytic Reduction Using Molding Catalysts Mn-Ce/FA and Mn-Ce/FA-30%TiO2

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