Manganese–niobium mixed oxide catalyst for the selective catalytic reduction of NOx with NH3 at low temperatures

Lian, Zhihua; Liu, Fudong; He, Hong; Mo, Jiansong; Wu, Zhongbiao

doi:10.1016/j.cej.2014.03.065

Cited by 244 publications

(99 citation statements)

References 44 publications

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“…S4). The results indicated that the introduction of Nb enhanced both the amount and strength of acid sites, which were beneficial for the adsorption together with activation of NH 3 , leading to an excellent NH 3 -SCR activity in the entire temperature range [14]. Fig.…”

Section: Nh 3 and No X Adsorption Abilitymentioning

confidence: 83%

“…In addition, Nb-containing compounds and materials are currently essential catalysts for a variety of reactions, like the hydrogenation of alkane and the catalytic removal of nitrogen oxides [14]. It was reported that the NH 3 -SCR reactivity of Nbcontaining MnO x -CeO 2 was dramatically improved as a result of Nb addition, and the characterization results indicated that the strong interaction between Nb and Mn catalytic active sites resulted in a remarkable dispersion of the oxidizing sites together with acidic sites and inhibited the unselective NH 3 oxidation at high temperatures [15].…”

Section: Introductionmentioning

confidence: 99%

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Promotional effect of Nb additive on the activity and hydrothermal stability for the selective catalytic reduction of NO with NH3 over CeZrO catalyst

Ding

Liu

Shi

et al. 2016

Applied Catalysis B: Environmental

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Section: Nh 3 and No X Adsorption Abilitymentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Promotional effect of Nb additive on the activity and hydrothermal stability for the selective catalytic reduction of NO with NH3 over CeZrO catalyst

Ding

Liu

Shi

et al. 2016

Applied Catalysis B: Environmental

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162

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“…[6,52,53] Notably, species at approximately 373 K would be physisorbed NO x , and NO 2 would likely be generated if the temperature increased to 410 K. Additionally, species at higher temperature in the range of 473-573 K and 573-698 K could be ascribed to bridged and bidentate nitrate, respectively. To directly compare the amounts of the NO x species in two catalysts, semiquantitative analysis for NO x species in two samples was conducted.…”

mentioning

confidence: 96%

Investigations on the Antimony Promotional Effect on CeO₂–WO₃/TiO₂ for Selective Catalytic Reduction of NO_x with NH₃

Liang

Liu

et al. 2016

ChemCatChem

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Antimony‐doped CeO2–WO3/TiO2 catalysts were prepared by a conventional ultrasonic‐assisted impregnation method and employed for selective catalytic reduction of NOx with NH3 at low temperature. Both experimental work and theoretical studies were employed to elucidate the effect of the antimony on promoting the CeO2–WO3/TiO2 catalyst. The catalytic activity of CeO2–WO3/TiO2 was largely improved after the addition of antimony oxide. It was found that antimony doping reduced the crystal size and strengthened the synergistic effect between the metal cations, which resulted in a favorable catalyst surface status with abundant active surface oxygen, Brønsted acid sites, and effective electron transfer. Both in situ diffuse reflectance infrared Fourier transform analysis and DFT calculation results revealed that the ammonia and NOx desorption behavior over the catalyst surface were considerably different. For the ammonia species, rather large amounts of the active NH4+ and NH3 species anchored on the surface of the Sb‐doped CeO2–WO3/TiO2. In view of the NOx species, the amount of nonactive bidentate nitrate species was largely reduced and the amount of active gaseous NO2 species was clearly enhanced, which lowered the activation energy of the catalytic process and gave rise to the elevated low‐temperature NH3 selective catalytic reduction activity. All these preferable properties resulted in the elevated de‐NOx activity of the Sb‐doped CeO2–WO3/TiO2 catalyst.

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“…15 In addition, it was reported that the introduction of the third main group element (such as Mn, Fe, Co, Mo) could also improve the activity, stability or SO 2 durability of the SCR catalysts. [16][17][18][19] Therefore, based on our V-Ce catalyst, we can add other elements to adjust its physicochemical properties, expecting to enhance the low temperature SCR activity.…”

Section: Introductionmentioning

confidence: 99%

Nb-doped VO_x/CeO₂ catalyst for NH₃-SCR of NO_x at low temperatures

Lian

Liu

et al. 2015

RSC Adv.

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The promotion effect of Nb addition to VO x /CeO 2 catalysts for the selective catalytic reduction of NO x by NH 3 was fully investigated. VO x /CeO 2 and NbO x doped VO x /CeO 2 catalysts were characterized by N 2 physisorption, XRD, H 2 -TPR and NH 3 -TPD. The results showed that the addition of Nb could significantly promote the SCR activity of the VO x /CeO 2 catalyst, especially in the low temperature range. VO x /CeO 2 with 30 wt% NbO x catalyst showed the best catalytic performance and better SO 2 /H 2 O tolerance than VO x /CeO 2 catalyst. 30Nb-1VO x /CeO 2 also exhibited higher NH 3 -SCR activity than 3V 2 O 5 -WO 3 /TiO 2 .Lower crystallinity, stronger redox capability and more Brønsted acid sites of the Nb-VO x /CeO 2 catalyst were all responsible for its more excellent NH 3 -SCR performance. Based on kinetic experiments and in situ DRIFTS results, it was concluded that the Langmuir-Hinshelwood mechanism existed for selective catalytic reduction of NO over Nb-VO x /CeO 2 , in which adsorbed NO x species reacted with adsorbed NH 3 to finally form N 2 and H 2 O.

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Manganese–niobium mixed oxide catalyst for the selective catalytic reduction of NOx with NH3 at low temperatures

Cited by 244 publications

References 44 publications

Promotional effect of Nb additive on the activity and hydrothermal stability for the selective catalytic reduction of NO with NH3 over CeZrO catalyst

Promotional effect of Nb additive on the activity and hydrothermal stability for the selective catalytic reduction of NO with NH3 over CeZrO catalyst

Investigations on the Antimony Promotional Effect on CeO₂–WO₃/TiO₂ for Selective Catalytic Reduction of NO_x with NH₃

Nb-doped VO_x/CeO₂ catalyst for NH₃-SCR of NO_x at low temperatures

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Manganese–niobium mixed oxide catalyst for the selective catalytic reduction of NOx with NH3 at low temperatures

Cited by 244 publications

References 44 publications

Promotional effect of Nb additive on the activity and hydrothermal stability for the selective catalytic reduction of NO with NH3 over CeZrO catalyst

Promotional effect of Nb additive on the activity and hydrothermal stability for the selective catalytic reduction of NO with NH3 over CeZrO catalyst

Investigations on the Antimony Promotional Effect on CeO2–WO3/TiO2 for Selective Catalytic Reduction of NOx with NH3

Nb-doped VOx/CeO2 catalyst for NH3-SCR of NOx at low temperatures

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Product

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Investigations on the Antimony Promotional Effect on CeO₂–WO₃/TiO₂ for Selective Catalytic Reduction of NO_x with NH₃

Nb-doped VO_x/CeO₂ catalyst for NH₃-SCR of NO_x at low temperatures