Modeling and optimization of NH3-SCR performance of MnOx/γ-alumina nanocatalysts by response surface methodology

Mousavi, Seyed Mahdi; Panahi, Parvaneh Nakhostin

doi:10.1016/j.jtice.2016.09.033

Cited by 13 publications

(7 citation statements)

References 25 publications

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“…The sintering process in iron-making plants uses coal or coke as fuel, which is a major emission source of NOx. About 35-50% of the total NOx emission from the iron and steel industry is attributed to the sintering process [2][3][4]. The new ultra-low emission standard of air pollutants for the iron and steel industry will be issued by Chinese government and require that NOx concentration in the sintering flue gas should be below 50 mg/m 3 .…”

Section: Introductionmentioning

confidence: 99%

Mechanism and Performance of the SCR of NO with NH3 over Sulfated Sintered Ore Catalyst

Chen

Qin

et al. 2019

Catalysts

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A sulfated sintered ore catalyst (SSOC) was prepared to improve the denitration performance of the sintered ore catalyst (SOC). The catalysts were characterized by X-ray Fluorescence Spectrometry (XRF), Brunauer–Emmett–Teller (BET) analyzer, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and diffuse reflectance infrared spectroscopy (DRIFTS) to understand the NH3-selective catalytic reduction (SCR) reaction mechanism. Moreover, the denitration performance and stability of SSOC were also investigated. The experimental results indicated that there were more Brønsted acid sites at the surface of SSOC after the treatment by sulfuric acid, which lead to the enhancement of the adsorption capacity of NH3 and NO. Meanwhile, Lewis acid sites were also observed at the SSOC surface. The reaction between −NH2, NH 4 + and NO (E-R mechanism) and the reaction of the coordinated ammonia with the adsorbed NO2 (L-H mechanism) were attributed to NOx reduction. The maximum denitration efficiency over the SSOC, which was about 92%, occurred at 300 °C, with a 1.0 NH3/NO ratio, and 5000 h−1 gas hourly space velocity (GHSV).

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Section: Introductionmentioning

confidence: 99%

Mechanism and Performance of the SCR of NO with NH3 over Sulfated Sintered Ore Catalyst

Chen

Qin

et al. 2019

Catalysts

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“…Nitrogen oxides (NO x ) emitted from vehicles are major air pollutants that require strict environmental regulations because of their toxicity [1,2,3]. Selective catalytic reduction (SCR) of NO x using reductant is a one of the most efficient and low cost technology for elimination of NO x from engine exhaust gases [4,5,6].…”

Section: Introductionmentioning

confidence: 99%

“…The catalysts are an important factor for SCR technology [7]. A catalyst includes a substrate material, active components such as transition, noble and rare metals and different supported materials such as zeolites, alumina, TiO 2 , active carbon [1,8].…”

Section: Introductionmentioning

confidence: 99%

The effect of H2O on the use of ethanol as reductant in the SCR system

Keskin

2021

European Mechanical Science

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In this experimental study, effects of H 2 O on the use of ethanol as reducing agents were investigated on the Ag-Pt-W-Ti/Cordierite catalyst. Ag-Pt-W-Ti/Cordierite catalyst was synthesized using the impregnation method for selective catalytic reduction (SCR) of NO x . To investigate the effects of H 2 O addition on the NO x conversion ratios, tests were carried out at 200-270 ° C under 30000 h -1 GHSV using three different reductants (ethanol, 5% H 2 O -95% ethanol, 10% H 2 O -90% ethanol). The catalytic activity of the catalyst increased with increase in exhaust gas temperature. The highest NO x conversion ratio was 89.9% at 270 o C with ethanol. The tests showed that when the H 2 O content of the reductant increased from 5% to 10%, the NO x conversion ratios significantly decreased at temperatures below 240 o C. NO x conversion ratios enhanced as engine load increased.

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“…However, the disadvantage of their development is their high production costs, which is why they are being replaced by transition metals or by transition metal oxides that are more economical as an active phase [1,4,7]. Among the transition metal oxides, manganese oxides supported in alumina have been used for soot combustion [8], the ozonization of volatile organic compounds [9,10] and the selective catalytic reduction (SCR) of nitric oxide [11], among other reactions, in which a charge transfer is presented between the active center and the reactants. The most common method for supporting manganese oxides is wet impregnation, mainly with acetate salts or manganese nitrate to produce Mn 3 O 4 or Mn 2 O 3 as the active phase [9].…”

Section: Introductionmentioning

confidence: 99%

Electrical Behavior of a Catalyst Composed of Laminar Manganese Oxide Supported on γ-Al2O3

2019

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The electrical characterization of catalysts composed of layered manganese oxide in the form of birnessite supported on γ-Al2O3, which have been successfully used in the combustion of soot, is presented. The results indicate that the electrical conduction and ion conduction processes are influenced by the amount of the active phase. There was also evidence of Grotthuss-type proton conductivity favored by the presence of surface water on the exposed alumina surface. The above is supported by the porous nature of the catalyst in which the surface area varied between 125.2 ± 1.2 and 159.0 ± 1.1 m2/g, evidencing changes in the alumina surface. The conductivity, determined from measurements of impedance spectroscopy, at low frequency showed changes associated with the amount of the active phase. The values ranged from 2.61 × 10−8 ± 2.1 × 10−9 Ω−1·cm−1 (pure alumina) to 7.33 × 10−8 ± 5.9 × 10−9 Ω−1·cm−1, 7.21 × 10−8 ± 5.8 × 10−9 Ω−1·cm−1 and 4.51 × 10−7 ± 3.6 × 10−8 Ω−1·cm−1 at room temperature for catalysts with nominal active phase contents of 5.0, 10.0 and 20.0%, respectively. Such results indicate that it is possible to modulate the electrical properties with variations in the synthesis parameters.

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Modeling and optimization of NH3-SCR performance of MnOx/γ-alumina nanocatalysts by response surface methodology

Cited by 13 publications

References 25 publications

Mechanism and Performance of the SCR of NO with NH3 over Sulfated Sintered Ore Catalyst

Mechanism and Performance of the SCR of NO with NH3 over Sulfated Sintered Ore Catalyst

The effect of H2O on the use of ethanol as reductant in the SCR system

Electrical Behavior of a Catalyst Composed of Laminar Manganese Oxide Supported on γ-Al2O3

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