Mn/TiO2 and Mn–Fe/TiO2 catalysts synthesized by deposition precipitation—promising for selective catalytic reduction of NO with NH3 at low temperatures

Putluru, Siva Sankar Reddy; Schill, Leonhard; Jensen, Anker Degn; Siret, Bernard; Tabaries, Franck; Fehrmann, Rasmus

doi:10.1016/j.apcatb.2014.10.060

Cited by 261 publications

(116 citation statements)

References 30 publications

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“…These results indicated that manganese oxides showed a remarkable activity for SCR at the temperature range between 100 to 300°C. Putluru et al (2015) demonstrated that 25 wt% Mn0.75Fe0.25Ti-DP catalyst prepared by deposition precipitation exhibited superior low-temperature SCR, and it was probably due to the presence of amorphous phases of manganese oxides and iron oxides with the properties of high surface area, high total acidity, acid strength and so on.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with iron oxides, manganese oxides are generally used as active composition supported on a carrier. The spent carrier materials included TiO 2 (Fang et al, 2014;Putluru et al, 2015), spinel (Yang et al, 2011;Yang et al, 2016), zeolite (Kim et al, 2012;Huang et al, 2016), and so forth. These results indicated that manganese oxides showed a remarkable activity for SCR at the temperature range between 100 to 300°C.…”

Section: Introductionmentioning

confidence: 99%

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Characterization and SCR Performance of Nano-Structured Iron-Manganese Oxides: Effect of Annealing Temperature

Chen

et al. 2017

Aerosol Air Qual. Res.

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Nano-structured iron-manganese oxides composite was prepared by annealing of natural Mn-rich limonite at different temperatures (500, 600, 700, 800°C). Their SCR performances of NO removal by NH 3 were evaluated, and SEM, TEM, XRD, XRF, BET, XPS, Raman, NH 3 -TPD were utilized to analyze the catalytic mechanism. The results indicated that after annealing at 500°C, the as-prepared iron-manganese oxides exhibited the best SCR performance in NO conversion and N 2 selectivity (over 80%) at the temperature window of 150-300°C. An increase in annealing temperature from 500 to 800°C significantly increased the particle size resulting in the decrease of surface areas, active sites, and then SCR performances. The experimental results suggested the natural Mn-rich limonite was an excellent precursor for preparing iron-manganese oxides and possessed excellent SCR performance of NO removal by NH 3 . This study will provide a novel way for the preparation of SCR catalyst and exploit a new application field for natural limonite.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization and SCR Performance of Nano-Structured Iron-Manganese Oxides: Effect of Annealing Temperature

Chen

et al. 2017

Aerosol Air Qual. Res.

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“…However, there are some inevitable problems for this catalyst, such as the toxicity of VO x , a relatively narrow temperature window (300-400°C) and the deactivation caused by dust and SO 2 [4]. Therefore, it is vital for us to develop the low-temperature SCR catalysts which can be located the downstream of the desulfurizer and the electrostatic precipitator [5,6].…”

Section: Introductionmentioning

confidence: 98%

Porous bimetallic Mn2Co1Ox catalysts prepared by a one-step combustion method for the low temperature selective catalytic reduction of NOx with NH3

Qiao

Wang

et al. 2015

Catalysis Communications

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“…The results of NH 3 -TPD can also explain the low NO conversion exhibited by the Co/ γ -Al 2 O 3 catalyst. With investigation of the reports on the topic, it can be concluded that Mn/γ -Al 2 O 3 prepared by the homogeneous deposition precipitation (HDP) method has better low temperature activity than some manganese supporting other materials for SCR of NO in the literature 26,32 In conclusion, cobalt, copper, and manganese oxide nanocatalysts supported on γ -Al 2 O 3 were prepared by the HDP method and activity of these catalysts was investigated in NH 3 -SCR of the NO process. The experimental results showed that Mn/γ -Al 2 O 3 has the best catalytic activity, which was above 60% at the temperature range between 200 and 300…”

Section: Correlation Between Physicochemical Properties and Catalyticmentioning

confidence: 99%

Activity of $\gamma $-Al$_{2}$O$_{3}$-based Mn, Cu, and Co oxide nanocatalysts for selective catalytic reduction of nitric oxide with ammonia

Panahi¹,

Delahay²,

Mousavi³

2017

Turk J Chem

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Abstract:Our studies on the selective catalytic reduction of NO (SCR-deNO) properties of M/ γ -Al 2 O 3 (M = Mn, Co, Cu) nanocatalysts are presented. All catalysts were prepared by homogeneous deposition precipitation using urea as the precursor for the precipitating agent. The SCR activity followed the order Mn/ γ -AlThe nanocatalysts were characterized with respect to their texture (N 2 -BET), particle size (TEM), reducibility (H 2 -TPR), and acidity (NH 3 -TPD). The TEM analysis revealed that the metal species have superior dispersion with less agglomeration and sintering on γ -Al 2 O 3 support. The H 2 -TPR results confirmed that the Mn/ γ -Al 2 O 3 nanocatalyst contains various oxidation states of manganese, which is useful for the catalyst to maintain the DeNO activities. The NH 3 -TPD studies indicated that the addition of transition metal can significantly increase the surface acidity and Mn/ γ -Al 2 O 3 showed the most adsorbed sites of NH 3 . Characterization results indicated that the acidity and the redox properties of the catalyst play important roles in the final catalytic activity in the SCR-NO process.

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Mn/TiO2 and Mn–Fe/TiO2 catalysts synthesized by deposition precipitation—promising for selective catalytic reduction of NO with NH3 at low temperatures

Cited by 261 publications

References 30 publications

Characterization and SCR Performance of Nano-Structured Iron-Manganese Oxides: Effect of Annealing Temperature

Characterization and SCR Performance of Nano-Structured Iron-Manganese Oxides: Effect of Annealing Temperature

Porous bimetallic Mn2Co1Ox catalysts prepared by a one-step combustion method for the low temperature selective catalytic reduction of NOx with NH3

Activity of $\gamma $-Al$_{2}$O$_{3}$-based Mn, Cu, and Co oxide nanocatalysts for selective catalytic reduction of nitric oxide with ammonia

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