Elucidate the promotional effects of Sn on Ce-Ti catalysts for NH3-SCR activity

Gong, Pijun; Xie, Jun; Cheng, Xiangkui; Fang, De; He, Feng; Li, Fengxiang; Qi, Kai

doi:10.1016/j.joei.2019.09.006

Cited by 20 publications

(10 citation statements)

References 47 publications

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“…Kim et al 16 investigated the effect of the Ce loading amount on the 13% W/x% Ce/TiO 2 catalyst activity and found that the NO x conversion ratios at 300°C were below 90% with NH 3 reductant. Gong et al 23 found that NO x conversions of Ce 0.2,0.3,0.4,0.5 -Ti at 300°C was close to 90%. Kwon et al 30 found that NO x conversion ratios of Ce-V/T and Ce-V/TW catalysts with NH 3 reductant at 300°C were close to 80%.…”

Section: Resultsmentioning

confidence: 97%

“…Thus, some metals-doped Ce Ti catalysts such as CeO 2 -MnO x , CeO 2 -Fe 2 O 3 , CeO 2 -CuO, CeO 2 -Al 2 O 3 , and CeO 2 -TiO 2 catalysts have been investigated to enhance the activity and high-temperature stability. 22,23 CeO 2 /TiO 2 catalysts have high SCR activity and thermal stability at 250-400°C. 14 In recent years, Ce-based catalysts have been studied by many research groups.…”

Section: Introductionmentioning

confidence: 99%

“…Gong et al 22 showed that the P 0.15 -Ce 0.3 -Zr-Ti catalysts have an excellent NH 3 -SCR activity at 180-400°C. Gong et al 23 prepared the Ce 0.2 -Sn 0.1 -Ti catalyst with hydrothermal method. They found that Ce 0.2 -Sn 0.1 -Ti catalyst has excellent catalytic activity at 200°C.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of deactivation effect of Au addition to Ce/TiO₂ catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions

Keskin

2021

J of Chemical Tech & Biotech

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BACKGROUND: NO x emissions are very toxic and cause serious adverse environmental effects. NO x reduction technologies have been developed due to the harmful effects of NO x and increasingly stringent emission standards which apply in many countries. Selective catalytic reduction (SCR) is the most effective method of removing NO x from engine exhaust. The suitable active catalysts are important for providing higher NO x conversion efficiencies in the SCR system. Catalyst production methods affect catalytic activity due to change in elemental composition, morphology, dispersion of catalytic elements, and total surface area. In this study, de-NO x performance of Ce/TiO 2 and Au-Ce/TiO 2 catalysts were investigated with real exhaust gases. Tests were carried out within 200-300°C temperature range to evaluate low temperature performance of the catalysts. Cordierite material was used as the support material and pre-treated with hot acid solution to enhance surface area. Ce content of synthesized catalysts with impregnation method was adjusted as 4 wt% and Au content as 0.4, 0.8, and 1.6 wt%. The catalysts were characterized with Scanning Electron Microscope (SEM), Brunauer-Emmett-Teller (BET), X-Ray Diffractometer (XRD), and Fourier transform infrared spectroscopy (FT-IR) analysis. RESULTS: Maximum NO x conversion ratios obtained at 300°C with the Ce/TiO 2 , 0.4 Au-Ce/TiO 2 , 0.8 Au-Ce/TiO 2 , and 1.6 Au-Ce/ TiO 2 catalysts were 95.1%, 92%, 92.6%, and 90.2%, respectively. CONCLUSIONS:The results showed that in general, de-NO x effect of the Ce/TiO 2 catalyst was greater than the Au doped Ce/TiO 2 catalysts. Au addition adversely affected surface properties of the catalyst and therefore activity of the Au-Ce/TiO 2 catalysts decreased.

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of deactivation effect of Au addition to Ce/TiO₂ catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions

Keskin

2021

J of Chemical Tech & Biotech

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“…The reason may be that the anions (C or N) substitute lattice oxygen atoms, which will promote the electron transfer of TiO 2 and the cycle of redox reaction, thereby improving the SCR activity of the catalyst. 45 The XPS spectrum of the catalyst C 1s is shown in Fig. 4(G).…”

Section: Xps Analysismentioning

confidence: 99%

C,N‐modified TiO₂‐supported Mn–Ce–Co_x‐based catalyst for low‐temperature NH₃‐SCR

Liu

Sun

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: The emission of NO x can causes serious environmental pollution and endangers human health. In recent years, the selective catalytic reduction of NO with NH 3 (NH 3 -SCR) technology has been widely studied and adopted to reduce the production and emissions of NO x during many technologies.RESULTS: A series of Mn-Ce-Co x /Ti-C,N catalysts were prepared by the impregnation method, and low-temperature NH 3 -SCR was studied. The results show that support modification (Ti-C,N) can broaden the operation temperature window of the catalyst (NO conversion >95%: Mn-Ce/TiO 2 catalyst, 160-320 °C; Mn-Ce/Ti-C,N catalyst, 140-320 °C). The doping of Co further improves the low-temperature NH 3 -SCR of the catalyst. When n(Co):n(Ti) = 0.05, the catalyst has the best catalytic performance with the NO conversion reaches 100% at 100 °C.CONCLUSION: Temperature-programmed reduction (H 2 -TPR) and temperature-programmed desorption (NH 3 -TPD) results showed that Ti-C,N can improve the redox ability but reduces the surface acidity. Co-doping has no effect on surface acidity, but the redox ability is further improved. A suitable amount of Co-doping is beneficial to the optimal catalytic activity of Mn-Ce-Co 0.05 /Ti-C,N catalyst. This suggests a balance between redox properties and surface acidity. Especially for the strong redox ability, it can promote the oxidation of NO to NO 2 , and promote low-temperature NH 3 -SCR through the 'fast SCR' pathway. X-ray photoelectron spectroscopy results of the highest chemisorbed oxygen (O ⊍ ) concentration and relative atomic ratio (Mn 4+ /Mn n+ , Ce 3+ /Ce n+ and Co 3+ /Co n+ ) confirmed the above conclusion. Both the Langmuir-Hinshelwood (L-H) and Eley-Rideal (E-R) mechanisms occurred in the NH 3 -SCR reaction over the Mn-Ce-Co 0.05 /Ti-C,N catalyst.

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“…For coal-fired boilers, the main technical means to reduce NO x emissions include the use of a low-NO x burner, 1,2 air staging, 3,4 reburning technology, 5 selective catalytic reduction, or selective non-catalytic reduction. 6 Low-NO x burners and air staging in the furnace are widely used because of their low operation cost, low transformation cost, high denitration efficiency, and convenient construction. However, unsatisfactory NO x emission and low char burnout often occur during boiler operation with air staging in the furnace.…”

Section: Introductionmentioning

confidence: 99%

Influence of overfire air rate of the two‐channel overfire air on flow and combustion characteristics in a 600‐MWe boiler

Wang

Jin

et al. 2021

Asia-Pacific J Chem Eng

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To solve the problem of high NO x emission of 600-MWe boilers in power plants, we established a cold gas-solid modeling testbed scaled by 1:5 for twochannel overfire air (OFA). A phase-Doppler anemometer was used to measure the characteristics of the outlet flow field of the two-channel OFA under different OFA rates. We also verified the industrial feasibility of this testbed under loads of 300 and 600 MWe. The influence of the OFA rate on the divergence angle of the outlet jet was small: When the OFA rate was increased from 15% to 35%, the divergence angle only increased by 2.2 . The attenuation

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Elucidate the promotional effects of Sn on Ce-Ti catalysts for NH3-SCR activity

Cited by 20 publications

References 47 publications

Investigation of deactivation effect of Au addition to Ce/TiO₂ catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions

Investigation of deactivation effect of Au addition to Ce/TiO₂ catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions

C,N‐modified TiO₂‐supported Mn–Ce–Co_x‐based catalyst for low‐temperature NH₃‐SCR

Influence of overfire air rate of the two‐channel overfire air on flow and combustion characteristics in a 600‐MWe boiler

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Elucidate the promotional effects of Sn on Ce-Ti catalysts for NH3-SCR activity

Cited by 20 publications

References 47 publications

Investigation of deactivation effect of Au addition to Ce/TiO2 catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions

Investigation of deactivation effect of Au addition to Ce/TiO2 catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions

C,N‐modified TiO2‐supported Mn–Ce–Cox‐based catalyst for low‐temperature NH3‐SCR

Influence of overfire air rate of the two‐channel overfire air on flow and combustion characteristics in a 600‐MWe boiler

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Investigation of deactivation effect of Au addition to Ce/TiO₂ catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions

Investigation of deactivation effect of Au addition to Ce/TiO₂ catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions

C,N‐modified TiO₂‐supported Mn–Ce–Co_x‐based catalyst for low‐temperature NH₃‐SCR