Iron doped effects on active sites formation over activated carbon supported Mn-Ce oxide catalysts for low-temperature SCR of NO

Yang, Jie; Ren, Shan; Zhang, Tianshi; Su, Zenghui; Long, Hongming; Kong, Ming; Lu, Yong

doi:10.1016/j.cej.2019.122398

Cited by 207 publications

(84 citation statements)

References 44 publications

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“…The XPS of O 1s was consisted of two peaks at 532.4 eV and 530.2 eV, belonging to the chemisorption oxygen (Oα) and lattice oxygen (Oβ), respectively [11,31]. From Figure 5c, the content of Oα for Mn-Ce/AC catalyst was 76.92%, while that for CaO poisoning catalyst decreased to 74.63%.…”

Section: Xps Analysismentioning

confidence: 96%

“…Figure 7 showed NH 3 -TPD profiles of Mn-Ce/AC and CaO-Mn-Ce/AC catalysts. In NH 3 -TPD profiles, the acid amount and strength were decided by the area and position of the desorption peak [11]. From Figure 7, the peak of weak acid site on Mn-Ce/AC and CaO poisoning catalysts could be observed at about 130-170 • C, which indicated that loading CaO did not change the position of the weak acid site.…”

Section: Ft-ir Analysismentioning

confidence: 96%

“…An attractive alternative for lower temperatures, and thus for tail-end configuration without or with much lower flue gas heating, is the application of activated carbons (ACs) [6][7][8]. In our previous study [1,[9][10][11][12], MnO 2 and CeO 2 supported on AC catalyst showed outstanding SCR activity at the lower temperature. Therefore, it is expected to work successfully in the NO removal of sintered flue gas.…”

Section: Introductionmentioning

confidence: 99%

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Deactivation Effect of CaO on Mn-Ce/AC Catalyst for SCR of NO with NH3 at Low Temperature

Ren

Chen

et al. 2020

Catalysts

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In this study, the poisoning effect of CaO on activated carbon (AC)-based Mn-Ce catalysts was discussed. Loading CaO inhibited the catalytic activity of the catalyst and the NO conversion of the catalyst decreased from 69.5% to 38.2% at 75 °C. The amount of MnO2 in AC surface decreased in the process of loading CaO, which was detrimental to the Selective Catalytic Reduction (SCR) performance of the catalyst. The change of manganese oxide form inhibited generation rate for the chemisorption oxygen and NO2, which was the most critical reason for the decrease of catalytic activity. Besides, loaded CaO entered into the pores of the catalyst, which led to the blockage of the pores and further resulted in the decrease of the Brunauer-Emmett-Teller (BET) surface area and total pore volume. It also destroyed the oxygen-containing functional groups and acid site on the surface of AC. All of these caused the deactivation of Mn-Ce/AC catalyst after loading CaO.

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Section: Xps Analysismentioning

confidence: 96%

Section: Ft-ir Analysismentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Deactivation Effect of CaO on Mn-Ce/AC Catalyst for SCR of NO with NH3 at Low Temperature

Ren

Chen

et al. 2020

Catalysts

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“…The traditional NH 3 -SCR catalyst used in the power plant is composed of V 2 O 5 -WO 3 /TiO 2 , and its suitable working temperature is between 300 °C and 400 °C [2]. However, the applicable temperature of the traditional catalyst is much higher than the flue gas temperature in cement, iron and steel, and other industries [3]. Developing low-temperature NH 3 -SCR catalyst (< 200 °C) is significance.…”

Section: Introductionmentioning

confidence: 99%

Effects of Ce over TiO₂ supported MnO_x-based Catalyst for NO_x Reduction by Ammonia

Liu

2020

E3S Web Conf.

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Ce modified MnOx-based catalysts have attracted much attention due to its high activity for selective catalytic reduction of NOx by NH3 (NH3-SCR) at low-temperatures. However, the most important role of Ce on the NH3-SCR performance of MnOx-based catalysts has not been confirmed. Herein, the typical Ce-Mn/TiO2 catalyst was synthesized through incipient-wetness impregnation method, the positive role of Ce on Ce-Mn/TiO2 catalyst in the NH3-SCR process was revealed by combining different activity tests (including NO oxidation and NH3 oxidation) and characterizations (including XRD, XPS and He-TPDMS experiments). It was found that the introduction of Ce can promote the dispersion of MnOx on TiO2 support. Meanwhile, the doping of Ce in MnOx can also increase the content of Mn4+ species. The Mn4+ species plays a crucial role in NO oxidation reaction, which can trigger the “Fast SCR” reaction and promote the conversion of NOx. This work provides insight into the catalyst design for NH3-SCR process at low-temperature.

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“…This process, however, must be performed at 330-400 °C to avoid catalyst deactivation by H 2 O and SO 2 . In comparison, low-temperature SCR processes are preferable because they avoid the need for thermal treatment in industrial furnaces, and the research of lowtemperature SCR catalysts has drawn a great attention [6,7]. Extensive research currently focuses on developing novel catalysts.…”

Section: Introductionmentioning

confidence: 99%

New Insight into Inhibition effect of SO2 and H2O on deNOx Performance of FeTi Catalyst Prepared by a CTAB-Assisted Process

Liu

et al. 2020

Catal Lett

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FeTi catalysts prepared by a CTAB-assisted process exhibited good resistance to H 2 O and SO 2 when tested in the selective catalytic reduction (SCR) at low temperatures. The physicochemical properties of the catalysts and the NO reaction behaviour under the influence of H 2 O and SO 2 were extensively characterized using BET, TEM, TPD-MASS, TPSR and in-situ DRIFTS. It was found that catalyst deactivation in the early stage of H 2 O and SO 2 introduction was mainly caused by pore plugging, resulting from the ammonium-sulfate salts deposition, while the active phase sulfation and competitive adsorption became the dominant catalyst-inhibiting factors in the later stage. SO 2 not only greatly inhibited NO adsorption on the catalyst surface, hindering the reaction through the Langmuir-Hinshelwood path, but also inhibited the reaction between adsorbed NH 3 and NO (Eley-Rideal path). Moreover, H 2 O promoted the transformation of NH 4 HSO 4 to (NH 4 ) 2 SO 4 , suggesting the "combined inhibition" of SO 2 and H 2 O, which was also reflected by in-situ DRIFTS that a clear increase of NH 3 adsorbed sites and sulfate species could be detected, thus resulting in more serious deactivation.

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Iron doped effects on active sites formation over activated carbon supported Mn-Ce oxide catalysts for low-temperature SCR of NO

Cited by 207 publications

References 44 publications

Deactivation Effect of CaO on Mn-Ce/AC Catalyst for SCR of NO with NH3 at Low Temperature

Deactivation Effect of CaO on Mn-Ce/AC Catalyst for SCR of NO with NH3 at Low Temperature

Effects of Ce over TiO₂ supported MnO_x-based Catalyst for NO_x Reduction by Ammonia

New Insight into Inhibition effect of SO2 and H2O on deNOx Performance of FeTi Catalyst Prepared by a CTAB-Assisted Process

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Iron doped effects on active sites formation over activated carbon supported Mn-Ce oxide catalysts for low-temperature SCR of NO

Cited by 207 publications

References 44 publications

Deactivation Effect of CaO on Mn-Ce/AC Catalyst for SCR of NO with NH3 at Low Temperature

Deactivation Effect of CaO on Mn-Ce/AC Catalyst for SCR of NO with NH3 at Low Temperature

Effects of Ce over TiO2 supported MnOx-based Catalyst for NOx Reduction by Ammonia

New Insight into Inhibition effect of SO2 and H2O on deNOx Performance of FeTi Catalyst Prepared by a CTAB-Assisted Process

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Effects of Ce over TiO₂ supported MnO_x-based Catalyst for NO_x Reduction by Ammonia