Deactivation by SO2 of MnOx/Al2O3 catalysts used for the selective catalytic reduction of NO with NH3 at low temperatures

Kijlstra, W.S.

doi:10.1016/s0926-3373(97)00089-1

Cited by 244 publications

(26 citation statements)

References 23 publications

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“…The conversion of NO was stable for 300 min at 433 K in the absence of SO 2 gas, as we reported previously [14]. In the presence of SO 2 at 433 K, the conversion of NO decreased with the reaction time, which indicates that the SO 2 poisoned the catalyst, as in the case of the Mn-based catalysts [9]. The reaction temperature had a significant effect on the deactivation rate of the TiO 2 photocatalyst.…”

Section: Resultssupporting

confidence: 77%

“…The problem with Mn-based catalysts is low resistance to SO 2 poisoning. Kijlstra et al [9] proposed that the formation of MnSO 4 is the main reason for the deactivation of MnO x /Al 2 O 3 catalysts. The formed sulfates decomposed at 1020 K, which means regeneration of the catalysts is only possible at much higher temperatures than the reaction temperature.…”

Section: Introductionmentioning

confidence: 99%

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Effects of SO₂ on selective catalytic reduction of NO with NH₃ over a TiO₂ photocatalyst

Yamamoto

Teramura

Hosokawa

et al. 2015

Science and Technology of Advanced Materials

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The effect of SO2 gas was investigated on the activity of the photo-assisted selective catalytic reduction of nitrogen monoxide (NO) with ammonia (NH3) over a TiO2 photocatalyst in the presence of excess oxygen (photo-SCR). The introduction of SO2 (300 ppm) greatly decreased the activity of the photo-SCR at 373 K. The increment of the reaction temperature enhanced the resistance to SO2 gas, and at 553 K the conversion of NO was stable for at least 300 min of the reaction. X-ray diffraction, FTIR spectroscopy, thermogravimetry and differential thermal analysis, x-ray photoelectron spectroscopy (XPS), elemental analysis and N2 adsorption measurement revealed that the ammonium sulfate species were generated after the reaction. There was a strong negative correlation between the deposition amount of the ammonium sulfate species and the specific surface area. Based on the above relationship, we concluded that the deposition of the ammonium sulfate species decreased the specific surface area by plugging the pore structure of the catalyst, and the decrease of the specific surface area resulted in the deactivation of the catalyst.

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Section: Resultssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Effects of SO₂ on selective catalytic reduction of NO with NH₃ over a TiO₂ photocatalyst

Yamamoto

Teramura

Hosokawa

et al. 2015

Science and Technology of Advanced Materials

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“…This suggests that NO or SO 2 molecules and Hg 0 vapor could be competitively adsorbed on the surface of 12Co 3 O 4 /CNNS [9]. In addition, the adsorbed SO 2 may react with Co 3 O 4 to produce thermally-stable metal sulfates, i.e., cobalt sulfate, leading to the decline of the active phases [42]. Thus, the competitive adsorption and side reactions contribute to the remarkable suppressive influences of NO and SO 2 towards Hg 0 adsorption.…”

Section: Impact Of Flue Gasmentioning

confidence: 99%

Co3O4/g-C3N4 Hybrids for Gas-Phase Hg0 Removal at Low Temperature

Zhang

Liu

2019

Processes

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The Co3O4/g-C3N4 hybrids are constructed via the incipient wetness impregnation method by depositing Co3O4 onto the exterior of g-C3N4, and then employed for Hg0 capture within 60–240 °C. The results show that the Co3O4/g-C3N4 hybrid with a Co3O4 content of 12 wt% performs optimally with the highest Hg0 removal efficiency of ~100% at or above 120 °C. The high performances of the Co3O4/g-C3N4 hybrids are probably attributed to the tight interfacial contact between Co3O4 and g-C3N4, with its improved electron transfer, inferring that cobalt oxide and g-C3N4 display a cooperative effect towards Hg0 removal. NO and SO2 shows a significant suppressive influence on the mercury capture performance, plausibly owing to the competing adsorption and side reactions.

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“…At coal-fired power stations, V2O5-WO3/TiO2 is the most commonly used SCR catalyst. However, the high operating temperature window of 300 -400°C is associated with a variety of problems [6,7], such as the possible oxidation of SO2 and the high energy consumption [8,9]. Therefore, there is a need for the development of low temperature SCR catalysts, which has attracted a wide attention in recent years [10,11].…”

Section: Introductionmentioning

confidence: 99%

Promotion effect and mechanism of the addition of Mo on the enhanced low temperature SCR of NOx by NH3 over MnOx/γ-Al2O3 catalysts

Yang

Zhao

Luo

et al. 2019

Applied Catalysis B: Environmental

132

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A series of Mn/γ-Al2O3 and MnMo/γ-Al2O3 catalysts were prepared by using Incipient Wetness Impregnation (IWI) method. The catalytic performance tests showed that the Mn3Mo1.25/γ-Al2O3 demonstrated a higher SCR performance (NO conversion of around 96%) at a broad low temperature range (150 to 300°C). The characterization showed that the addition of Mo to the Mn/γ-Al2O3 catalysts could promote the dispersion of MnOx on the surface of γ-Al2O3. The adsorption of NO could form two different species, nitrites and nitrates on the surface of the catalyst. The presence of nitrites is beneficial to low temperature SCR. It is also found that the existence of Mo in the catalyst favours the formation of Mn 3+ , which plays a critical role in the adsorption of NH3 and therefore improves NH3 adsorption capacity of the MnOx/γ-Al2O3 catalysts. The low temperature SCR of the Mn3Mo1.25/γ-Al2O3 catalyst was found to mainly follow L-H mechanism, but E-R mechanism also plays a role to some extent. Moreover, it is also found that the addition of Mo not only mitigates the deactivation of catalysts, but also broadens the effective temperature range of the SCR catalyst.

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Deactivation by SO2 of MnOx/Al2O3 catalysts used for the selective catalytic reduction of NO with NH3 at low temperatures

Cited by 244 publications

References 23 publications

Effects of SO₂ on selective catalytic reduction of NO with NH₃ over a TiO₂ photocatalyst

Effects of SO₂ on selective catalytic reduction of NO with NH₃ over a TiO₂ photocatalyst

Co3O4/g-C3N4 Hybrids for Gas-Phase Hg0 Removal at Low Temperature

Promotion effect and mechanism of the addition of Mo on the enhanced low temperature SCR of NOx by NH3 over MnOx/γ-Al2O3 catalysts

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Deactivation by SO2 of MnOx/Al2O3 catalysts used for the selective catalytic reduction of NO with NH3 at low temperatures

Cited by 244 publications

References 23 publications

Effects of SO2 on selective catalytic reduction of NO with NH3 over a TiO2 photocatalyst

Effects of SO2 on selective catalytic reduction of NO with NH3 over a TiO2 photocatalyst

Co3O4/g-C3N4 Hybrids for Gas-Phase Hg0 Removal at Low Temperature

Promotion effect and mechanism of the addition of Mo on the enhanced low temperature SCR of NOx by NH3 over MnOx/γ-Al2O3 catalysts

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Effects of SO₂ on selective catalytic reduction of NO with NH₃ over a TiO₂ photocatalyst

Effects of SO₂ on selective catalytic reduction of NO with NH₃ over a TiO₂ photocatalyst