The selective catalytic reduction of NO over Ce0.3TiOx-supported metal oxide catalysts

Duan, Zhichen; Liu, Jian; Shi, Juan; Zhao, Zhen; Wei, Yuechang; Zhang, Xiao; Jiang, Guiyuan; Duan, Aijun

doi:10.1016/j.jes.2017.01.016

Cited by 15 publications

(16 citation statements)

References 34 publications

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“…Differently, Wang's group reported that only slight improvement in NH 3 −SCR and N 2 selectivity is observed on Ce−Ti mixed oxides catalyst after adding Fe species [25e] . Moreover, by impregnating 2 wt% of FeO x on Ce 0.3 −Ti (molar ratio of Ce/Ti=0.3), a drastic decreases in NH 3 −SCR activity of Ce−Ti mixed oxide catalyst was observed [68] …”

Section: Methods In Improving the Catalytic Activity Of Ceo2−tio2 Catmentioning

confidence: 93%

“…Duan et al. showed that MnOx impregnation on Ce−Ti mixed oxide catalyst can improve the low temperature activity but reduce the high temperature activity [68] . Leng et al.…”

Section: Methods In Improving the Catalytic Activity Of Ceo2−tio2 Catmentioning

confidence: 99%

“…Duan et al. prepared a series of CdO x /Ce−Ti oxide catalysts with different CdO x loading and showed that Ce−Ti catalyst with 2 wt %CdO x illustrates higher NH 3 −SCR activity and N 2 selectivity due to an increase in the NH 3 adsorption capacity [68,80] . The effect of Co decoration on the NH 3 −SCR performance of Ce−Ti mixed oxides was investigated by Liu et al [25e] .…”

Section: Methods In Improving the Catalytic Activity Of Ceo2−tio2 Catmentioning

confidence: 99%

“…[25e] Moreover, by impregnating 2 wt% of FeO x on Ce 0.3 À Ti (molar ratio of Ce/Ti = 0.3), a drastic decreases in NH 3 À SCR activity of CeÀ Ti mixed oxide catalyst was observed. [68]…”

Section: Iron (Fe) Modificationmentioning

confidence: 99%

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Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

et al. 2020

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Selective catalytic reduction of NOx with NH3 (NH3−SCR) is one of the widely used process to abate NOx emission from both stationary and mobile sources. Recently, CeO2−TiO2 based NH3−SCR catalysts due to their excellent medium and high temperature activities, high N2 selectivity and environmentally friendly, have attracted much attention as great candidate to replace the commercial VOx−TiO2 based NH3−SCR catalysts. During the past years, extensive works have been done to achieve the industrial commercialization of CeO2−TiO2 based NH3−SCR catalyst. In this review, we summarize the recent studies on the mechanism, deactivation, preparation and modification of CeO2−TiO2 catalyst. The focus of this review is the modification strategies on improving the catalytic performance of CeO2−TiO2 catalyst. By comparing the effect of different modification strategies on the catalytic performance of CeO2−TiO2 catalyst, the perspectives and challenges of CeO2−TiO2 based catalyst for NH3−SCR of NOx are discussed.

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Section: Methods In Improving the Catalytic Activity Of Ceo2−tio2 Catmentioning

confidence: 93%

“…Duan et al. showed that MnOx impregnation on Ce−Ti mixed oxide catalyst can improve the low temperature activity but reduce the high temperature activity [68] . Leng et al.…”

Section: Methods In Improving the Catalytic Activity Of Ceo2−tio2 Catmentioning

confidence: 99%

Section: Methods In Improving the Catalytic Activity Of Ceo2−tio2 Catmentioning

confidence: 99%

“…[25e] Moreover, by impregnating 2 wt% of FeO x on Ce 0.3 À Ti (molar ratio of Ce/Ti = 0.3), a drastic decreases in NH 3 À SCR activity of CeÀ Ti mixed oxide catalyst was observed. [68]…”

Section: Iron (Fe) Modificationmentioning

confidence: 99%

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Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

et al. 2020

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“…In order to develop the low‐cost catalysts, the oxides of transition metals such as Ti, V, Mo, W, Mn, Fe, Cr, Cu, and Co, are primarily used, but also lanthanides (mainly Ce and La) and rare‐earth metals which are able to promote the conversion efficiency can be applied . V 2 O 5 –WO 3 /TiO 2 and V 2 O 5 –MoO 3 /TiO 2 are well‐known as commercial selective catalytic reduction catalysts, however, they have a significant disadvantage related to high toxicity of V‐oxide species .…”

Section: Introductionmentioning

confidence: 99%

NO_x and CO Abatement by applying catalysts with an active coating made of transition non‐precious (CuO–Cr₂O₃, TiO₂) and precious (Pt) metals

Baltrėnas

Urbanas

2019

Env Prog and Sustain Energy

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In this study, the investigation of simultaneous removal of nitrogen oxides and carbon monoxide from gas emissions produced as a result of propane–butane gas combustion was performed. For this purpose, the special experimental prototype with catalysts of the honeycomb structure with an active layer synthesized by applying a plasma spray coating technique was used. During the present investigation, such active materials as precious metals (Pt) and also economically feasible materials such as copper–chromium oxide (CuO–Cr2O3) and titanium oxide (TiO2) were tested and compared. The mechanism of NOx and CO catalytic removal was described taking into account the NO and NO2 conversion. It was established that the initial CO concentration produced as a result of fuel combustion has a negligible impact on its removal efficiency while the initial CO/NOx ratio has a direct influence on the dependence of NOx removal efficiency on operating temperature. With increasing the CO/NOx ratio not only the NOx reduction efficiency can be increased but also the onset temperature of the catalytic conversion process can be lowered. The obtained results indicated that the efficiency of carbon monoxide and nitrogen oxides conversion with the use of tested transition metal oxides can achieve 95% and 80%, respectively. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13145, 2019

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Assessment of Lewis‐Acidic Surface Sites Using Tetrahydrofuran as a Suitable and Smart Probe Molecule

et al. 2022

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Measuring the Lewis‐acidic surface sites in catalysis is problematic when the material‘s surface area is very low (SBET ≤1 m2 ⋅ g−1). For the first time, a quantitative assessment of total acidic surface sites of very small surface area catalysts (MoO3 as pure and mixed with 5–30 % CdO (wt/wt), as well as CdO for comparison) was performed using a smart new probe molecule, tetrahydrofuran (THF). The results were nearly identical compared to using another commonly used probe molecule, pyridine. This audition is based on the limited values of the surface area of these samples that likely require a relatively moderate basic molecule as THF with pKb=16.08, rather than strong basic molecules such as NH3 (pKb=4.75) or pyridine (pKb=8.77). We propose mechanisms for the interaction of vapour phase molecules of THF with the Lewis‐cationic Mo and Cd atoms of these catalysts. Besides, dehydration of isopropyl alcohol was used as a probe reaction to investigate the catalytic activity of these catalysts to further support our findings in the case of THF in a temperature range of 175–300 °C. A good agreement between the obtained data of sample MoO3‐10 % CdO, which is characterised by the highest surface area value, the population of Lewis‐acidic sites and % selectivity of propylene at all the applied reaction temperatures was found.

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The selective catalytic reduction of NO over Ce0.3TiOx-supported metal oxide catalysts

Cited by 15 publications

References 34 publications

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

NO_x and CO Abatement by applying catalysts with an active coating made of transition non‐precious (CuO–Cr₂O₃, TiO₂) and precious (Pt) metals

Assessment of Lewis‐Acidic Surface Sites Using Tetrahydrofuran as a Suitable and Smart Probe Molecule

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The selective catalytic reduction of NO over Ce0.3TiOx-supported metal oxide catalysts

Cited by 15 publications

References 34 publications

Recent Progress of CeO2−TiO2 Based Catalysts for Selective Catalytic Reduction of NOx by NH3

Recent Progress of CeO2−TiO2 Based Catalysts for Selective Catalytic Reduction of NOx by NH3

NOx and CO Abatement by applying catalysts with an active coating made of transition non‐precious (CuO–Cr2O3, TiO2) and precious (Pt) metals

Assessment of Lewis‐Acidic Surface Sites Using Tetrahydrofuran as a Suitable and Smart Probe Molecule

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Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

NO_x and CO Abatement by applying catalysts with an active coating made of transition non‐precious (CuO–Cr₂O₃, TiO₂) and precious (Pt) metals